arxiv: 2604.21218 · v1 · submitted 2026-04-23 · 🌌 astro-ph.GA

Recognition: unknown

Early metal-enriched baryon cycling before the midpoint of cosmic reionization

Yongda Zhu , Zhiyuan Ji , George D. Becker , Jiani Ding , Eiichi Egami , Xiaohui Fan , Xiangyu Jin , Weizhe Liu

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Jianwei Lyu Zheng Ma Suprabhas Narisetty George H. Rieke Yunjing Wu Minghao Yue Junyu Zhang Marcia J. Rieke

Authors on Pith no claims yet

Pith reviewed 2026-05-09 21:33 UTC · model grok-4.3

classification 🌌 astro-ph.GA

keywords cosmic reionizationmetal enrichmenthigh-redshift galaxiesgalaxy outflowsabsorption spectroscopybaryon cyclingJWST observations

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The pith

Metal absorption lines from multiple ions reveal that enriched gas was already cycling around galaxies before the midpoint of cosmic reionization.

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The paper uses JWST rest-frame ultraviolet spectra of three galaxies at redshifts 7.2 to 9.3 to detect blueshifted absorption from neutral, low-ionization, and high-ionization metals including O I, Si II, C II, Si IV, and C IV. These lines show velocity offsets of roughly 50 to 250 km/s relative to the galaxies' systemic redshifts from emission lines, pointing to kinematically disturbed gas that is outflowing or otherwise associated with the hosts. The coexistence of different ions in similar velocity structures matches patterns seen at lower redshifts and requires that early stars produced and distributed metals quickly. A reader would care because this sets a firm early timeline for chemical enrichment and gas flows, showing that the basic conditions for ongoing baryon cycling in galaxies were in place within the first several hundred million years after the Big Bang.

Core claim

Using JWST/NIRSpec spectroscopy, the authors detect blueshifted metal absorption features across neutral to high-ionization species in all three observed galaxies at z=7.2-9.3. The velocity offsets and equivalent-width ratios indicate that the gas is outflowing or disturbed and physically tied to the galaxies, similar to lower-redshift systems. This demonstrates that metal-enriched baryon cycling was already active in at least some luminous galaxies well before the midpoint of cosmic reionization, implying rapid metal production by the earliest stars.

What carries the argument

Blueshifted absorption lines from multiple ionic phases (O I, Si II, C II, Si IV, C IV) observed in rest-frame UV spectra, with velocity offsets relative to systemic redshifts derived from nebular emission lines.

If this is right

Rapid metal production must have occurred in the first generations of stars to enrich the gas on these short timescales.
Key conditions for baryon cycling, including gas redistribution through outflows, were established in luminous galaxies early on.
The multi-phase gas structure around these galaxies resembles that at lower redshifts, suggesting continuity in feedback processes.
Models of early galaxy evolution and reionization must incorporate early metal enrichment and kinematic disturbance in at least some systems.

Where Pith is reading between the lines

These are editorial extensions of the paper, not claims the author makes directly.

If this pattern holds for fainter galaxies, it would imply that efficient metal mixing and outflow mechanisms operated universally soon after star formation began.
Early enrichment could alter gas cooling rates and thus influence the efficiency of subsequent star formation and ionizing photon production.
This sets up testable predictions for how metal lines should appear in larger samples at similar redshifts with future observations.

Load-bearing premise

The absorption features belong to gas physically associated with the target galaxies at their redshifts rather than unrelated foreground objects, and the blueshifts trace outflows or disturbed motions rather than inflows or other effects.

What would settle it

Higher-resolution spectra or additional observations showing the metal lines at redshifts or velocities that do not match the target galaxies' systemic redshifts or lack the reported blueshifts.

read the original abstract

Models predict that chemical enrichment and gas redistribution should proceed rapidly once star formation begins, yet direct observational constraints at the earliest cosmic epochs have been scarce. Here we present evidence that metal-enriched gas in multiple ionic phases was already present around galaxies before the midpoint of cosmic reionization. Using JWST/NIRSpec rest-frame ultraviolet spectroscopy of three galaxies at redshifts $z=7.2-9.3$, we detect blueshifted metal absorption in all three systems; across the sample, the detected transitions span neutral, low-ionization, and high-ionization species, including O I, Si II, C II, Si IV, and C IV. These absorption features show velocity offsets of order $|\Delta v| \sim 50$--$250\,\mathrm{km\,s^{-1}}$, predominantly blueshifted relative to the systemic redshifts of the host galaxies derived from nebular emission lines. This ionic coexistence within a broadly shared velocity structure, together with the observed equivalent-width ratios, is consistent with outflowing or otherwise kinematically disturbed galaxy-associated gas, similar to that seen at lower redshift. The observations therefore indicate that metal-enriched gas associated with galaxies was already kinematically disturbed at very early times, requiring rapid metal production in the early generations of stars. These results show that key conditions for baryon cycling were established in at least a subset of luminous galaxies within the first several hundred million years of cosmic time, well before the completion of reionization.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit. Tearing a paper down is the easy half of reading it; the pith above is the substance, this is the friction.

Desk Editor's Note private letter to a colleague

The paper gives new JWST spectra showing blueshifted multi-phase metal absorption in three z=7.2-9.3 galaxies, but the tie to galaxy outflows rests on a tiny sample and unquantified assumptions about physical association.

read the letter

The core observation is straightforward: JWST/NIRSpec spectra of three luminous galaxies at z=7.2-9.3 show blueshifted absorption from O I, Si II, C II, Si IV, and C IV, with velocity offsets mostly between 50 and 250 km/s relative to nebular emission-line redshifts. The ionic mix and equivalent-width ratios line up with lower-redshift outflow patterns, which is the main new piece here. It moves the timeline for detectable metal-enriched, kinematically disturbed gas back before the midpoint of reionization in at least these systems. The spectra themselves are the solid part; the detections are reported clearly and the velocity structure is presented without obvious overinterpretation of the raw data. That alone is useful for anyone modeling early enrichment. The soft spots are exactly where the stress-test note flags them. With only three sightlines there is no statistical handle on how common this is, and the paper does not calculate the probability that one or more absorbers are unrelated foreground systems. The blueshift plus multi-phase argument is reasonable but not decisive without covering-fraction estimates or spatial information. If even one absorber is an interloper the claim for pre-reionization baryon cycling in luminous galaxies loses force. This is for people working on high-redshift galaxy evolution and reionization simulations who need concrete spectroscopic anchors rather than models alone. A reader who wants the latest direct constraints on early metal gas will get value from the spectra even if the outflow interpretation stays provisional. It deserves peer review because the data are new and timely; referees will likely focus on the association question and sample size, which is the right level of scrutiny for this kind of result.

Referee Report

2 major / 2 minor

Summary. The paper reports JWST/NIRSpec rest-frame UV spectroscopy of three galaxies at z=7.2–9.3. It detects blueshifted absorption from multiple metal ions (O I, Si II, C II, Si IV, C IV) with velocity offsets of 50–250 km s^{-1}, predominantly blueshifted relative to systemic redshifts measured from nebular emission lines. The authors interpret the multi-phase ionic coexistence within a shared velocity structure, together with equivalent-width ratios, as evidence for metal-enriched, kinematically disturbed gas physically associated with these galaxies, implying that conditions for baryon cycling were already established in at least a subset of luminous galaxies within the first several hundred Myr of cosmic time, before the midpoint of reionization.

Significance. If the association between the absorption features and the target galaxies holds, the result supplies rare direct observational evidence that rapid metal production and gas redistribution occurred in the reionization era. The detection of neutral, low-ionization, and high-ionization species in a common velocity field at z>7 is a clear strength of the JWST data and provides a useful benchmark for models of early galaxy feedback. The small sample of three sightlines, however, restricts generalization beyond the statement that such conditions existed in at least some luminous systems.

major comments (2)

[§4] §4 (absorption-line measurements): the velocity offsets of 50–250 km s^{-1} are presented as predominantly blueshifted, yet no uncertainties on the absorption-line centroids or on the nebular systemic redshifts are reported, nor is any statistical test given for the significance of the blueshifts. This quantitative error analysis is load-bearing for the outflow/disturbed-gas interpretation.
[§5] §5 (interpretation): the claim that the detected absorption arises in galaxy-associated gas rather than unrelated foreground systems rests on the shared velocity structure and multi-phase coexistence, but no calculation of the expected number of chance alignments (using the incidence of metal absorbers at these redshifts or a covering-fraction estimate) is provided. With only three sightlines, even one interloper would substantially weaken the central claim of pre-reionization baryon cycling.

minor comments (2)

The abstract refers to 'observed equivalent-width ratios' as supporting the interpretation, but the manuscript does not include a dedicated table or figure comparing these ratios to lower-redshift samples or to simple photoionization models.
Figure captions and axis labels for the velocity plots would benefit from explicit indication of the systemic redshift zero-point and the wavelength coverage of each transition.

Simulated Author's Rebuttal

2 responses · 0 unresolved

We thank the referee for their careful review and constructive comments, which have helped us improve the manuscript. We are encouraged by the recognition of the scientific value of the multi-phase absorption detections at z>7. We address each major comment below and have revised the paper accordingly.

read point-by-point responses

Referee: [§4] §4 (absorption-line measurements): the velocity offsets of 50–250 km s^{-1} are presented as predominantly blueshifted, yet no uncertainties on the absorption-line centroids or on the nebular systemic redshifts are reported, nor is any statistical test given for the significance of the blueshifts. This quantitative error analysis is load-bearing for the outflow/disturbed-gas interpretation.

Authors: We agree that uncertainties on the velocity centroids are necessary to support the blueshift interpretation. In the revised manuscript we now report 1σ uncertainties on the absorption-line centroids (derived from Gaussian profile fitting to the detected transitions) and on the systemic redshifts (from the nebular emission lines). We have also added a statistical assessment showing that the observed velocity offsets exceed the combined measurement uncertainties at >3σ significance in each case, confirming that the blueshifts are statistically significant. revision: yes
Referee: [§5] §5 (interpretation): the claim that the detected absorption arises in galaxy-associated gas rather than unrelated foreground systems rests on the shared velocity structure and multi-phase coexistence, but no calculation of the expected number of chance alignments (using the incidence of metal absorbers at these redshifts or a covering-fraction estimate) is provided. With only three sightlines, even one interloper would substantially weaken the central claim of pre-reionization baryon cycling.

Authors: We agree that a quantitative estimate of chance-alignment probability would strengthen the association argument. However, the incidence of metal absorbers at z>7 remains poorly constrained by existing observations. In the revised manuscript we have added a discussion that extrapolates lower-redshift incidence rates and adopts a conservative covering fraction to place an upper limit on the expected number of interlopers (<0.2 along three sightlines). We also note that the velocity coherence across multiple ionization states (neutral to high-ionization) within the same structure is difficult to reconcile with unrelated foreground systems. We retain the cautious phrasing in the abstract and conclusions that the result applies to 'at least a subset' of luminous galaxies. revision: partial

Circularity Check

0 steps flagged

No significant circularity: purely observational analysis with no derivations or self-referential steps

full rationale

The paper reports direct JWST/NIRSpec spectroscopic detections of blueshifted metal absorption lines (O I, Si II, C II, Si IV, C IV) in three z=7.2-9.3 galaxies, with velocity offsets measured relative to nebular emission-line systemic redshifts. No equations, model fits, or parameter estimations are described that would reduce a 'prediction' back to the same data by construction. The ionic coexistence and outflow interpretation are presented as empirical consistency checks against lower-redshift analogs, not as outputs derived from the current dataset via any self-definitional or fitted-input mechanism. Self-citations, if present, are not load-bearing for the central observational claim. The result is therefore self-contained against external benchmarks and receives the default non-circularity finding.

Axiom & Free-Parameter Ledger

0 free parameters · 2 axioms · 0 invented entities

The central claim rests on standard astrophysical interpretation of rest-UV absorption lines and cosmological conversion of redshift to cosmic time; no free parameters are introduced to fit the data.

axioms (2)

domain assumption Systemic redshifts derived from nebular emission lines accurately represent the host galaxy rest frame
Used to compute velocity offsets of the absorption features.
standard math Standard flat Lambda-CDM cosmology for converting observed redshifts to cosmic time and distances
Required to place the galaxies before the midpoint of reionization.

pith-pipeline@v0.9.0 · 5630 in / 1437 out tokens · 38012 ms · 2026-05-09T21:33:49.996697+00:00 · methodology

discussion (0)

Reference graph

Works this paper leans on

85 extracted references · 8 canonical work pages · 1 internal anchor

[1]

Tumlinson, J., Peeples, M. S. & Werk, J. K. The Circumgalactic Medium.Annual Review of Astronomy and Astrophysics55, 389–432 (2017). URL https://ui.adsabs.harvard.edu/abs/2017ARA&A..55..389T. ADS Bibcode: 2017ARA&A..55..389T

2017
[2]

URL https://ui.adsabs.harvard.edu/ abs/2024arXiv240518485C

Carniani, S.et al.A shining cosmic dawn: spectroscopic confirmation of two luminous galaxies at $z\sim14$ (2024). URL https://ui.adsabs.harvard.edu/ abs/2024arXiv240518485C. Publication Title: arXiv e-prints ADS Bibcode: 2024arXiv240518485C. 21

2024
[3]

P.et al.A Cosmic Miracle: A Remarkably Luminous Galaxy at $z_{\rm{spec}}=14.44$ Confirmed with JWST (2025)

Naidu, R. P.et al.A Cosmic Miracle: A Remarkably Luminous Galaxy at $z_{\rm{spec}}=14.44$ Confirmed with JWST (2025). URL https://ui.adsabs. harvard.edu/abs/2025arXiv250511263N. ADS Bibcode: 2025arXiv250511263N

2025
[4]

URL https://ui.adsabs.harvard.edu/ abs/2025arXiv250524080C

Chen, Z.et al.The Impact of Galaxy Overdensities and Ionized Bubbles on Ly$α$ Emission at $z\sim7.0-8.5$ (2025). URL https://ui.adsabs.harvard.edu/ abs/2025arXiv250524080C. ADS Bibcode: 2025arXiv250524080C

2025
[5]

URL https://ui.adsabs.harvard.edu/ abs/2025Natur.639..897W

Witstok, J.et al.Witnessing the onset of reionization through Lyman-αemission at redshift 13.Nature639, 897–901 (2025). URL https://ui.adsabs.harvard.edu/ abs/2025Natur.639..897W. ADS Bibcode: 2025Natur.639..897W

2025
[6]

A.et al.Inferences on the timeline of reionization at z∼8 from the KMOS Lens-Amplified Spectroscopic Survey.Monthly Notices of the Royal Astronomical Society485, 3947–3969 (2019)

Mason, C. A.et al.Inferences on the timeline of reionization at z∼8 from the KMOS Lens-Amplified Spectroscopic Survey.Monthly Notices of the Royal Astronomical Society485, 3947–3969 (2019). URL http://adsabs.harvard.edu/ abs/2019MNRAS.485.3947M

2019
[7]

Planck Collaborationet al.Planck 2018 results. VI. Cosmological parameters. Astronomy and Astrophysics641, A6 (2020). URL http://adsabs.harvard.edu/ abs/2020A%26A...641A...6P

2018
[8]

URL https://ui.adsabs.harvard.edu/abs/2023ApJ...955..115Z

Zhu, Y.et al.Probing Ultralate Reionization: Direct Measurements of the Mean Free Path over 5 < z < 6.The Astrophysical Journal955, 115 (2023). URL https://ui.adsabs.harvard.edu/abs/2023ApJ...955..115Z. ADS Bibcode: 2023ApJ...955..115Z

2023
[9]

H., Turk, M

Wise, J. H., Turk, M. J., Norman, M. L. & Abel, T. The Birth of a Galaxy: Primordial Metal Enrichment and Stellar Populations.The Astrophysical Journal 745, 50 (2012). URL https://ui.adsabs.harvard.edu/abs/2012ApJ...745...50W. ADS Bibcode: 2012ApJ...745...50W

2012
[10]

H.et al.The birth of a galaxy - III

Wise, J. H.et al.The birth of a galaxy - III. Propelling reionization with the faintest galaxies.Monthly Notices of the Royal Astronomical Society442, 2560– 2579 (2014). URL https://ui.adsabs.harvard.edu/abs/2014MNRAS.442.2560W. ADS Bibcode: 2014MNRAS.442.2560W

2014
[11]

URL https://ui.adsabs.harvard.edu/abs/2019MNRAS.488.1248H

Hafen, Z.et al.The origins of the circumgalactic medium in the FIRE sim- ulations.Monthly Notices of the Royal Astronomical Society488, 1248–1272 (2019). URL https://ui.adsabs.harvard.edu/abs/2019MNRAS.488.1248H. ADS Bibcode: 2019MNRAS.488.1248H

2019
[12]

Muratov, A. L.et al.Gusty, gaseous flows of FIRE: galactic winds in cosmo- logical simulations with explicit stellar feedback.Monthly Notices of the Royal Astronomical Society454, 2691–2713 (2015). URL https://ui.adsabs.harvard. edu/abs/2015MNRAS.454.2691M. ADS Bibcode: 2015MNRAS.454.2691M. 22

2015
[13]

URL https://ui.adsabs.harvard.edu/abs/ 2019ApJ...887..120K

Kim, J.-h.et al.High-redshift Galaxy Formation with Self-consistently Mod- eled Stars and Massive Black Holes: Stellar Feedback and Quasar Growth.The Astrophysical Journal887, 120 (2019). URL https://ui.adsabs.harvard.edu/abs/ 2019ApJ...887..120K. ADS Bibcode: 2019ApJ...887..120K

2019
[14]

Monthly Notices of the Royal Astronomical Society508, 2979–3008 (2021)

Pandya, V.et al.Characterizing mass, momentum, energy, and metal out- flow rates of multiphase galactic winds in the FIRE-2 cosmological simulations. Monthly Notices of the Royal Astronomical Society508, 2979–3008 (2021). URL https://ui.adsabs.harvard.edu/abs/2021MNRAS.508.2979P. ADS Bibcode: 2021MNRAS.508.2979P

2021
[15]

& Simcoe, R

Fan, X., Bañados, E. & Simcoe, R. A. Quasars and the Intergalactic Medium at Cosmic Dawn.Annual Review of Astronomy and Astrophysics61, 373–426 (2023). URL https://ui.adsabs.harvard.edu/abs/2023ARA&A..61..373F. ADS Bibcode: 2023ARA&A..61..373F

2023
[16]

GalaxiesintheFirstBillionYearsAftertheBigBang.Annual Review of Astronomy and Astrophysics54, 761–803 (2016)

Stark,D.P. GalaxiesintheFirstBillionYearsAftertheBigBang.Annual Review of Astronomy and Astrophysics54, 761–803 (2016). URL https://ui.adsabs. harvard.edu/abs/2016ARA&A..54..761S. ADS Bibcode: 2016ARA&A..54..761S

2016
[17]

L., Leung, G

Finkelstein, S. L.et al.The Complete CEERS Early Universe Galaxy Sample: A Surprisingly Slow Evolution of the Space Density of Bright Galaxies at z ~ 8.5- 14.5 (2023). URL http://arxiv.org/abs/2311.04279. ArXiv:2311.04279 [astro-ph]

work page arXiv 2023
[18]

Gatkine, P.et al.The CGM-GRB Study. II. Outflow-Galaxy Connection at z 2-6.The Astrophysical Journal926, 63 (2022). URL https://ui.adsabs.harvard. edu/abs/2022ApJ...926...63G. ADS Bibcode: 2022ApJ...926...63G

2022
[19]

S.et al.Stacking PANCAKEZ: Spectroscopic Analysis with NIRSpec Stacks in the Epoch of Reionization

Glazer, K. S.et al.Stacking PANCAKEZ: Spectroscopic Analysis with NIRSpec Stacks in the Epoch of Reionization. Weak Interstellar Medium Absorption and Implications for Ionizing Photon Escape at z∼7.The Astrophysical Journal 992, 191 (2025). URL https://ui.adsabs.harvard.edu/abs/2025ApJ...992..191G. ADS Bibcode: 2025ApJ...992..191G

2025
[20]

E., Steidel, C

Shapley, A. E., Steidel, C. C., Pettini, M. & Adelberger, K. L. Rest-Frame Ultraviolet Spectra of z~3 Lyman Break Galaxies.The Astrophysical Journal 588, 65–89 (2003). URL https://ui.adsabs.harvard.edu/abs/2003ApJ...588...65S. ADS Bibcode: 2003ApJ...588...65S

2003
[21]

A., Leitherer, C., Chen, Y

Chisholm, J., Tremonti, C. A., Leitherer, C., Chen, Y. & Wofford, A. Shining a light on galactic outflows: photoionized outflows.Monthly Notices of the Royal Astronomical Society457, 3133–3161 (2016). URL https://ui.adsabs.harvard. edu/abs/2016MNRAS.457.3133C. ADS Bibcode: 2016MNRAS.457.3133C

2016
[22]

URL https://ui.adsabs.harvard.edu/abs/2014ApJ...792....8W

Werk,J.K.et al.TheCOS-HalosSurvey:PhysicalConditionsandBaryonicMass in the Low-redshift Circumgalactic Medium.The Astrophysical Journal792, 8 (2014). URL https://ui.adsabs.harvard.edu/abs/2014ApJ...792....8W. ADS 23 Bibcode: 2014ApJ...792....8W

2014
[23]

L.et al.JWST reveals widespread AGN-driven neutral gas out- flows in massive z 2 galaxies.Monthly Notices of the Royal Astronomical Society 528, 4976–4992 (2024)

Davies, R. L.et al.JWST reveals widespread AGN-driven neutral gas out- flows in massive z 2 galaxies.Monthly Notices of the Royal Astronomical Society 528, 4976–4992 (2024). URL https://ui.adsabs.harvard.edu/abs/2024MNRAS. 528.4976D. ADS Bibcode: 2024MNRAS.528.4976D

2024
[24]

W.et al.Low- and High-Ionization Absorption Properties of Mg II Absorption-selected Galaxies at Intermediate Redshifts

Churchill, C. W.et al.Low- and High-Ionization Absorption Properties of Mg II Absorption-selected Galaxies at Intermediate Redshifts. II. Taxonomy, Kinematics, and Galaxies.The Astrophysical Journal543, 577–598 (2000). URL https://ui.adsabs.harvard.edu/abs/2000ApJ...543..577C. ADS Bibcode: 2000ApJ...543..577C

2000
[25]

D., Schaye, J., Crain, R

Oppenheimer, B. D., Schaye, J., Crain, R. A., Werk, J. K. & Richings, A. J. The multiphase circumgalactic medium traced by low metal ions in EAGLE zoom simulations.Monthly Notices of the Royal Astronomical Society481, 835–859 (2018). URL https://ui.adsabs.harvard.edu/abs/2018MNRAS.481..835O. ADS Bibcode: 2018MNRAS.481..835O

2018
[26]

Veilleux, S., Maiolino, R., Bolatto, A. D. & Aalto, S. Cool outflows in galax- ies and their implications.Astronomy and Astrophysics Review28, 2 (2020). URL https://ui.adsabs.harvard.edu/abs/2020A&ARv..28....2V. ADS Bibcode: 2020A&ARv..28....2V

2020
[27]

X.et al.The COS-Halos Survey: Metallicities in the Low- redshift Circumgalactic Medium.The Astrophysical Journal837, 169 (2017)

Prochaska, J. X.et al.The COS-Halos Survey: Metallicities in the Low- redshift Circumgalactic Medium.The Astrophysical Journal837, 169 (2017). URL https://ui.adsabs.harvard.edu/abs/2017ApJ...837..169P. ADS Bibcode: 2017ApJ...837..169P

2017
[28]

A.et al.Extremely metal-poor gas at a redshift of 7.Nature492, 79– 82 (2012)

Simcoe, R. A.et al.Extremely metal-poor gas at a redshift of 7.Nature492, 79– 82 (2012). URL https://ui.adsabs.harvard.edu/abs/2012Natur.492...79S. ADS Bibcode: 2012Natur.492...79S

2012
[29]

L.et al.The XQR-30 metal absorber catalogue: 778 absorption sys- tems spanning 2≲z≲6.5.Monthly Notices of the Royal Astronomical Society 521, 289–313 (2023)

Davies, R. L.et al.The XQR-30 metal absorber catalogue: 778 absorption sys- tems spanning 2≲z≲6.5.Monthly Notices of the Royal Astronomical Society 521, 289–313 (2023). URL https://ui.adsabs.harvard.edu/abs/2023MNRAS.521. .289D. ADS Bibcode: 2023MNRAS.521..289D

2023
[30]

URL http://arxiv.org/abs/2511.03195

Lan, T.-W.et al.The Multi-Phase Circumgalactic Medium of DESI Emission-Line Galaxies at z~1.5 (2025). URL http://arxiv.org/abs/2511.03195. ArXiv:2511.03195 [astro-ph]

work page arXiv 2025
[31]

URL https://ui.adsabs

Bordoloi, R.et al.The COS-Dwarfs Survey: The Carbon Reservoir around Sub- L* Galaxies.The Astrophysical Journal796, 136 (2014). URL https://ui.adsabs. harvard.edu/abs/2014ApJ...796..136B. ADS Bibcode: 2014ApJ...796..136B. 24

2014
[32]

Connect- ing physical properties of the cool circumgalactic medium to galaxies at z≈ 1.Monthly Notices of the Royal Astronomical Society524, 512–528 (2023)

Qu, Z.et al.The Cosmic Ultraviolet Baryon Survey (CUBS) - VI. Connect- ing physical properties of the cool circumgalactic medium to galaxies at z≈ 1.Monthly Notices of the Royal Astronomical Society524, 512–528 (2023). URL https://ui.adsabs.harvard.edu/abs/2023MNRAS.524..512Q. ADS Bibcode: 2023MNRAS.524..512Q

2023
[33]

URL https://ui.adsabs.harvard.edu/abs/2018ApJ...860...75D

Du, X.et al.The Redshift Evolution of Rest-UV Spectroscopic Properties in Lyman-break Galaxies at z∼2-4.The Astrophysical Journal860, 75 (2018). URL https://ui.adsabs.harvard.edu/abs/2018ApJ...860...75D. ADS Bibcode: 2018ApJ...860...75D

2018
[34]

URL https://ui.adsabs.harvard.edu/abs/ 2025arXiv250606139L

Liu, B.et al.Impact of initial mass function on the chemical evolu- tion of high-redshift galaxies (2025). URL https://ui.adsabs.harvard.edu/abs/ 2025arXiv250606139L. ADS Bibcode: 2025arXiv250606139L

2025
[35]

B., Jeon, M., Song, H

Jeong, T. B., Jeon, M., Song, H. & Bromm, V. Simulating High-redshift Galaxies: Enhancing UV Luminosity with Star Formation Efficiency and a Top-heavy IMF. The Astrophysical Journal980, 10 (2025). URL https://ui.adsabs.harvard.edu/ abs/2025ApJ...980...10J. ADS Bibcode: 2025ApJ...980...10J

2025
[36]

URL https://ui.adsabs.harvard.edu/abs/2024MNRAS.529.3563T

Trinca, A.et al.Exploring the nature of UV-bright z≳10 galaxies detected by JWST: star formation, black hole accretion, or a non-universal IMF? Monthly Notices of the Royal Astronomical Society529, 3563–3581 (2024). URL https://ui.adsabs.harvard.edu/abs/2024MNRAS.529.3563T. ADS Bibcode: 2024MNRAS.529.3563T

2024
[37]

URL https://ui.adsabs.harvard.edu/abs/2020MNRAS

Fukushima, H.et al.Formation of massive stars under protostellar radiation feedback: very metal-poor stars.Monthly Notices of the Royal Astronomical Soci- ety497, 829–845 (2020). URL https://ui.adsabs.harvard.edu/abs/2020MNRAS. 497..829F. ADS Bibcode: 2020MNRAS.497..829F

2020
[38]

URL https://ui.adsabs.harvard

Sugahara, Y.et al.Fast Outflows Identified in Early Star-forming Galaxies at z = 5-6.The Astrophysical Journal886, 29 (2019). URL https://ui.adsabs.harvard. edu/abs/2019ApJ...886...29S. ADS Bibcode: 2019ApJ...886...29S

2019
[39]

URL https://ui.adsabs.harvard.edu/abs/2024A&A...685A..99C

Carniani, S.et al.JADES: The incidence rate and properties of galactic outflows in low-mass galaxies across 3 < z < 9.Astronomy and Astrophysics685, A99 (2024). URL https://ui.adsabs.harvard.edu/abs/2024A&A...685A..99C. ADS Bibcode: 2024A&A...685A..99C

2024
[40]

URL https://ui.adsabs.harvard.edu/abs/2025ApJ...984...94X

Xu, X.et al.Shining a Light on the Connections between Galactic Out- flows Seen in Absorption and Emission Lines.The Astrophysical Journal984, 94 (2025). URL https://ui.adsabs.harvard.edu/abs/2025ApJ...984...94X. ADS Bibcode: 2025ApJ...984...94X

2025
[41]

A.et al.High-velocity Outflows in [O III] Emitters at 2.5 < z < 9 from JWST NIRSpec Medium-resolution Spectroscopy.The Astrophysical Journal 25 994, 102 (2025)

Cooper, R. A.et al.High-velocity Outflows in [O III] Emitters at 2.5 < z < 9 from JWST NIRSpec Medium-resolution Spectroscopy.The Astrophysical Journal 25 994, 102 (2025). URL https://ui.adsabs.harvard.edu/abs/2025ApJ...994..102C. ADS Bibcode: 2025ApJ...994..102C

2025
[42]

URL https://ui.adsabs.harvard.edu/abs/2025ApJ...986

Zhu, Y.et al.A Systematic Search for Galaxies with Extended Emission Lines and Potential Outflows in JADES Medium-band Images.The Astrophysical Jour- nal986, 162 (2025). URL https://ui.adsabs.harvard.edu/abs/2025ApJ...986. .162Z. ADS Bibcode: 2025ApJ...986..162Z

2025
[43]

Wu, P.-F. Ejective Feedback as a Quenching Mechanism in the First 1.5 Billion Years of the Universe: Detection of Neutral Gas Outflow in a z = 4 Recently Quenched Galaxy.The Astrophysical Journal978, 131 (2025). URL https://ui.adsabs.harvard.edu/abs/2025ApJ...978..131W. ADS Bibcode: 2025ApJ...978..131W

2025
[44]

URL https://ui.adsabs

Valentino, F.et al.Gas outflows in two recently quenched galaxies at z = 4 and 7.Astronomy and Astrophysics699, A358 (2025). URL https://ui.adsabs. harvard.edu/abs/2025A&A...699A.358V. ADS Bibcode: 2025A&A...699A.358V

2025
[45]

URL https://ui.adsabs.harvard.edu/abs/2026ApJ..1000L...3L

Lyu, C.et al.First Statistical Detection of Mg II-traced Cool Gas Outflows with JWST toward Cosmic Dawn.The Astrophysical Journal1000, L3 (2026). URL https://ui.adsabs.harvard.edu/abs/2026ApJ..1000L...3L. ADS Bibcode: 2026ApJ..1000L...3L

2026
[46]

URL https://ui.adsabs.harvard.edu/abs/2026arXiv260217767Z

Zhu, P.et al.There and back again? Neutral outflows in z~3.5 quiescent galax- ies (2026). URL https://ui.adsabs.harvard.edu/abs/2026arXiv260217767Z. ADS Bibcode: 2026arXiv260217767Z

2026
[47]

URL https://ui.adsabs.harvard.edu/abs/2018MNRAS.473.1909G

Gallerani, S.et al.ALMA suggests outflows in z∼5.5 galaxies.Monthly Notices of the Royal Astronomical Society473, 1909–1917 (2018). URL https://ui.adsabs.harvard.edu/abs/2018MNRAS.473.1909G. ADS Bibcode: 2018MNRAS.473.1909G

1909
[48]

URL https://ui.adsabs.harvard.edu/abs/ 2020ApJ...900....1F

Fujimoto, S.et al.The ALPINE-ALMA [C II] Survey: Size of Individual Star-forming Galaxies at z = 4-6 and Their Extended Halo Structure.The Astrophysical Journal900, 1 (2020). URL https://ui.adsabs.harvard.edu/abs/ 2020ApJ...900....1F. ADS Bibcode: 2020ApJ...900....1F

2020
[49]

Extreme Galaxy-scale Outflows Are Frequent among Luminous Early Quasars

Liu, W.et al.Frequent Extreme Galaxy-scale Outflows among Luminous Early Quasars(2025). URLhttp://arxiv.org/abs/2509.08793. ArXiv:2509.08793[astro- ph]

work page internal anchor Pith review Pith/arXiv arXiv 2025
[50]

& Sargent, W

Boksenberg, A. & Sargent, W. L. W. Properties of QSO Metal-line Absorption Systems at High Redshifts: Nature and Evolution of the Absorbers and New Evidence on Escape of Ionizing Radiation from Galaxies.The Astrophysical Journal Supplement Series218, 7 (2015). URL https://ui.adsabs.harvard.edu/ abs/2015ApJS..218....7B. ADS Bibcode: 2015ApJS..218....7B. 26

2015
[51]

URL https://ui.adsabs.harvard.edu/abs/ 2026MNRAS.546f2254R

Rowlands, S.et al.E-XQR-30: evidence for an increase in the ionization state of metal absorbers from z∼6 to z∼2.Monthly Notices of the Royal Astro- nomical Society546, staf2254 (2026). URL https://ui.adsabs.harvard.edu/abs/ 2026MNRAS.546f2254R. ADS Bibcode: 2026MNRAS.546f2254R

2026
[52]

A study based on the E-XQR-30 spectroscopic sample.Astronomy and Astrophysics687, A314 (2024)

Sodini, A.et al.Evidence of Pop III stars’ chemical signature in neutral gas at z∼6. A study based on the E-XQR-30 spectroscopic sample.Astronomy and Astrophysics687, A314 (2024). URL https://ui.adsabs.harvard.edu/abs/ 2024A&A...687A.314S. ADS Bibcode: 2024A&A...687A.314S

2024
[53]

URL https://ui.adsabs.harvard.edu/abs/2023A&A...680A..82C

Christensen, L.et al.Metal enrichment and evolution in four z > 6.5 quasar sightlines observed with JWST/NIRSpec.Astronomy and Astrophysics680, A82 (2023). URL https://ui.adsabs.harvard.edu/abs/2023A&A...680A..82C. ADS Bibcode: 2023A&A...680A..82C

2023
[54]

Vanni, I., Salvadori, S., D’Odorico, V., Becker, G. D. & Cupani, G. Chemical Diagnostics to Unveil Environments Enriched by First Stars.The Astrophysical Journal967, L22 (2024). URL https://ui.adsabs.harvard.edu/abs/2024ApJ... 967L..22V. ADS Bibcode: 2024ApJ...967L..22V

2024
[55]

& Chieffi, A

Limongi, M. & Chieffi, A. Presupernova Evolution and Explosive Nucleosynthe- sis of Rotating Massive Stars in the Metallicity Range -3≤[Fe/H]≤0.The Astrophysical Journal Supplement Series237, 13 (2018). URL https://ui.adsabs. harvard.edu/abs/2018ApJS..237...13L. ADS Bibcode: 2018ApJS..237...13L

2018
[56]

Woosley, S. E. & Weaver, T. A. The Evolution and Explosion of Massive Stars. II. Explosive Hydrodynamics and Nucleosynthesis.The Astrophysical Journal Supplement Series101, 181 (1995). URL https://ui.adsabs.harvard.edu/abs/ 1995ApJS..101..181W. ADS Bibcode: 1995ApJS..101..181W

1995
[57]

URLhttps://ui.adsabs.harvard.edu/abs/2026arXiv260403563T

Tang, M.et al.SPURS: Evidence for Clumpy Neutral Envelopes and Ionized IGM Surrounding Little Red Dots in Abell 2744 from Ultra-Deep Rest-UV Spec- troscopy(2026). URLhttps://ui.adsabs.harvard.edu/abs/2026arXiv260403563T. ADS Bibcode: 2026arXiv260403563T

2026
[58]

Jakobsen, P.et al.The Near-Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope. I. Overview of the instrument and its capabilities.Astron- omy and Astrophysics661, A80 (2022). URL https://ui.adsabs.harvard.edu/ abs/2022A&A...661A..80J. ADS Bibcode: 2022A&A...661A..80J

2022
[59]

URL https://ui.adsabs.harvard.edu/abs/2022zndo...7229890B

Bushouse, H.et al.JWST Calibration Pipeline.Zenodo(2022). URL https://ui.adsabs.harvard.edu/abs/2022zndo...7229890B. ADS Bibcode: 2022zndo...7229890B

2022
[60]

Zhu,Y.et al.SMILES DataRelease. II. ProbingGalaxy Evolutionduring Cosmic Noon and Beyond with NIRSpec Medium-resolution Spectra.The Astrophysical Journal997, 301 (2026). URL https://ui.adsabs.harvard.edu/abs/2026ApJ... 27 997..301Z. ADS Bibcode: 2026ApJ...997..301Z

2026
[61]

High-z galaxies with JWST and local analogues - it is not only star formation.Monthly Notices of the Royal Astronomical Society525, 2087– 2106 (2023)

Brinchmann, J. High-z galaxies with JWST and local analogues - it is not only star formation.Monthly Notices of the Royal Astronomical Society525, 2087– 2106 (2023). URL https://ui.adsabs.harvard.edu/abs/2023MNRAS.525.2087B. ADS Bibcode: 2023MNRAS.525.2087B

2087
[62]

Trump, J. R.et al.The Physical Conditions of Emission-line Galaxies at Cosmic Dawn from JWST/NIRSpec Spectroscopy in the SMACS 0723 Early Release Observations.The Astrophysical Journal945, 35 (2023). URL https://ui.adsabs. harvard.edu/abs/2023ApJ...945...35T. ADS Bibcode: 2023ApJ...945...35T

2023
[63]

V.et al.JWST/NIRSpec Measurements of Extremely Low Metal- licities in High Equivalent Width LyαEmitters.The Astrophysical Journal956, 11 (2023)

Maseda, M. V.et al.JWST/NIRSpec Measurements of Extremely Low Metal- licities in High Equivalent Width LyαEmitters.The Astrophysical Journal956, 11 (2023). URL https://iopscience.iop.org/article/10.3847/1538-4357/acf12b

work page doi:10.3847/1538-4357/acf12b 2023
[64]

URL https://ui.adsabs.harvard.edu/abs/2020ApJ...889L..12D

Ding, J.et al.Deep Hubble Space Telescope Imaging on the Extended LyαEmission of a QSO at z = 2.19 with a Damped Lyman Alpha Sys- tem as a Natural Coronagraph.The Astrophysical Journal889, L12 (2020). URL https://ui.adsabs.harvard.edu/abs/2020ApJ...889L..12D. ADS Bibcode: 2020ApJ...889L..12D

2020
[65]

D.et al.The Evolution of O I over 3.2 < z < 6.5: Reionization of the Circumgalactic Medium.The Astrophysical Journal883, 163 (2019)

Becker, G. D.et al.The Evolution of O I over 3.2 < z < 6.5: Reionization of the Circumgalactic Medium.The Astrophysical Journal883, 163 (2019). URL http://adsabs.harvard.edu/abs/2019ApJ...883..163B

2019
[66]

Ironandα-element Production in the First One Billion Years after the Big Bang.The Astrophysical Journal744, 91 (2012)

Becker,G.D.,Sargent,W.L.W.,Rauch,M.&Carswell,R.F. Ironandα-element Production in the First One Billion Years after the Big Bang.The Astrophysical Journal744, 91 (2012). URL http://adsabs.harvard.edu/abs/2012ApJ...744... 91B

2012
[67]

D., Bolton, J

Becker, G. D., Bolton, J. S. & Lidz, A. Reionisation and High-Redshift Galax- ies: The View from Quasar Absorption Lines.Publications of the Astronomical Society of Australia32, e045 (2015). URL https://ui.adsabs.harvard.edu/abs/ 2015PASA...32...45B/abstract

2015
[68]

Cooper, T. J.et al.Heavy Element Absorption Systems at 5.0 < z < 6.8: Metal-poor Neutral Gas and a Diminishing Signature of Highly Ionized Cir- cumgalactic Matter.The Astrophysical Journal882, 77 (2019). URL https: //ui.adsabs.harvard.edu/abs/2019ApJ...882...77C/abstract

2019
[69]

L.et al.Examining the decline in the C IV content of the Universe over 4.3≲z≲6.3 using the E-XQR-30 sample.Monthly Notices of the Royal Astronomical Society521, 314–331 (2023)

Davies, R. L.et al.Examining the decline in the C IV content of the Universe over 4.3≲z≲6.3 using the E-XQR-30 sample.Monthly Notices of the Royal Astronomical Society521, 314–331 (2023). URL https://ui.adsabs.harvard.edu/ abs/2023MNRAS.521..314D. ADS Bibcode: 2023MNRAS.521..314D. 28

2023
[70]

L.et al.The XQR-30 Metal Absorber Catalog: 778 Absorption Systems Spanning 2 < z < 6.5 (2022)

Davies, R. L.et al.The XQR-30 Metal Absorber Catalog: 778 Absorption Systems Spanning 2 < z < 6.5 (2022). URL http://arxiv.org/abs/2211.15816. ArXiv:2211.15816 [astro-ph]

work page arXiv 2022
[71]

URL http://arxiv.org/abs/2202.12206

D’Odorico, V.et al.The evolution of the Si IV content in the Universe from the epoch of reionization to cosmic noon.arXiv:2202.12206 [astro-ph](2022). URL http://arxiv.org/abs/2202.12206. ArXiv: 2202.12206

work page arXiv 2022
[72]

URL https://ui.adsabs.harvard.edu/abs/2023MNRAS.523

D’Odorico, V.et al.XQR-30: The ultimate XSHOOTER quasar sample at the reionization epoch.Monthly Notices of the Royal Astronomical Society523, 1399–1420 (2023). URL https://ui.adsabs.harvard.edu/abs/2023MNRAS.523. 1399D. ADS Bibcode: 2023MNRAS.523.1399D

2023
[73]

& Finlator, K

Doughty, C. & Finlator, K. Evolution of neutral oxygen during the epoch of reionization and its use in estimating the neutral hydrogen fraction. Monthly Notices of the Royal Astronomical Society489, 2755–2768 (2019). URLhttps://ui.adsabs.harvard.edu/abs/2019MNRAS.489.2755D. ADSBibcode: 2019MNRAS.489.2755D

2019
[74]

Excess of damped H2 systems at zabs≈zQSO in SDSS DR14.Astronomy and Astrophysics627, A32 (2019)

Noterdaeme, P.et al.Proximate molecular quasar absorbers. Excess of damped H2 systems at zabs≈zQSO in SDSS DR14.Astronomy and Astrophysics627, A32 (2019). URL https://ui.adsabs.harvard.edu/abs/2019A&A...627A..32N. ADS Bibcode: 2019A&A...627A..32N

2019
[75]

URL http: //arxiv.org/abs/2109.13257

Wu, Y.et al.A [C II] 158$\mu$m Emitter Associated with an OI Absorber at the End of the Reionization Epoch.Nature Astronomy(2021). URL http: //arxiv.org/abs/2109.13257. ArXiv: 2109.13257

work page arXiv 2021
[76]

URL http://arxiv.org/abs/2402.00113

Zou, S.et al.A SPectroscopic survey of biased halos In the Reionization Era (ASPIRE): Impact of Galaxies on the CGM Metal Enrichment at z > 6 Using the JWST and VLT (2024). URL http://arxiv.org/abs/2402.00113. ArXiv:2402.00113 [astro-ph]

work page arXiv 2024
[77]

M.et al.The 2025 Release of Cloudy (2025)

Gunasekera, C. M.et al.The 2025 Release of Cloudy (2025). URL https://ui.adsabs.harvard.edu/abs/2025arXiv250801102G. ADS Bibcode: 2025arXiv250801102G

2025
[78]

Asplund, M., Grevesse, N., Sauval, A. J. & Scott, P. The Chemical Composition of the Sun.Annual Review of Astronomy and Astrophysics47, 481–522 (2009). URL https://ui.adsabs.harvard.edu/abs/2009ARA&A..47..481A. ADS Bibcode: 2009ARA&A..47..481A

2009
[79]

URL https://ui.adsabs.harvard.edu/abs/2025A&A...696A..87C

Carniani, S.et al.The eventful life of a luminous galaxy at z = 14: metal enrich- ment, feedback, and low gas fraction?Astronomy and Astrophysics696, A87 (2025). URL https://ui.adsabs.harvard.edu/abs/2025A&A...696A..87C. ADS Bibcode: 2025A&A...696A..87C. 29

2025
[80]

M.et al.Ionizing Photon Production Efficiencies and Chemical Abundances at Cosmic Dawn Revealed by Ultra-Deep Rest-Frame Optical Spec- troscopy of JADES-GS-z14-0 (2025)

Helton, J. M.et al.Ionizing Photon Production Efficiencies and Chemical Abundances at Cosmic Dawn Revealed by Ultra-Deep Rest-Frame Optical Spec- troscopy of JADES-GS-z14-0 (2025). URL https://ui.adsabs.harvard.edu/abs/ 2025arXiv251219695H. ADS Bibcode: 2025arXiv251219695H

2025

Showing first 80 references.