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REVIEW 3 major objections 7 minor 300 references

Little Red Dots are made of a compact red central engine sitting inside a more extended blue host galaxy.

Reviewed by Pith at T0; open to challenge. T0 means a machine referee read the full paper against a public rubric. the ladder, T0–T4 →

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2026-07-13 01:28 UTC pith:A6XB5H4K

load-bearing objection First clean IFU maps that put the red broad-line core and blue narrow-line host on the sky for five LRDs; the two-component picture holds for the clearer targets. the 3 major comments →

arxiv 2607.09647 v1 pith:A6XB5H4K submitted 2026-07-10 astro-ph.GA

Spatial decomposition of Little Red Dots with JWST/NIRSpec IFU into broad-line red cores and narrow-line blue host galaxies

Yuzo Ishikawa , Anna-Christina Eilers , Rohan P. Naidu , Jorryt Matthee , Rongmon Bordoloi , John Chisholm , Jenny E. Greene , Yilun Ma
show 6 more authors
Pascal A. Oesch Wendy Q. Sun Alberto Torralba John R. Weaver Stijn Wuyts Mengyuan Xiao
This is my paper
classification astro-ph.GA
keywords Little Red DotsActive galactic nucleiHigh-redshift galaxiesSupermassive black holesAGN host galaxiesJWSTNIRSpec IFU
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved

The pith

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

Little Red Dots are compact red sources found by JWST that show a V-shaped continuum, broad Balmer lines, and sometimes Balmer absorption. Their origin has been debated—evolved stars, dust-obscured black holes, or exotic single atmospheres. This paper tests the two-component idea by using JWST/NIRSpec integral-field spectroscopy to decompose, spaxel by spaxel, the blue continuum, red continuum, narrow lines, broad lines, and absorption in five broad-Hα LRDs at redshift about 5. The maps show blue continuum and narrow lines are co-spatial and more extended, while red continuum, broad Balmer emission, and absorption arise from a compact core; [O III] equivalent width also dips in that core. A sympathetic reader cares because this spatial separation would turn the conflicting spectral features into distinct physical regions rather than one unexplained object.

Core claim

For five broad Hα-selected Little Red Dots at z~5 observed with NIRSpec IFU (prism plus G395H), the blue continuum is co-spatial with the narrow emission-line region while the red continuum comes from a compact core co-spatial with the broad Balmer emission and absorption. Maps of [O III] equivalent width show a clear central dip. The authors conclude that LRD light is produced by at least two distinct components: a red central engine embedded in a blue host galaxy.

What carries the argument

Spatially resolved spectral decomposition of NIRSpec IFU datacubes: each spaxel is fit as blue power-law plus red modified blackbody continuum, plus independent narrow lines, broad Balmer lines, and Balmer absorption, then mapped in intensity and kinematics.

Load-bearing premise

The continuum fit cleanly separates host-galaxy light from central-engine light, without substantial leftover mixing of the two.

What would settle it

Higher-resolution or multi-wavelength maps that show red continuum, broad Balmer lines, and blue continuum all sharing one compact profile, with no extended blue or narrow-line component, would falsify the host-plus-engine decomposition.

Watch this falsifier — get emailed when new claim-graph text bears on it.

If this is right

  • The V-shaped continuum is the sum of an extended blue host and a compact red engine, not a single continuum source.
  • Broad Balmer lines and absorption originate in the compact red core, favoring an AGN-like or black-hole-star engine.
  • Host light can be isolated by selecting high-[O III] equivalent-width regions away from the red core.
  • Diversity among LRD spectra can be explained by changing contrast between host and central engine.
  • Measured LRD sizes must be wavelength-dependent because different components dominate at different wavelengths.

Where Pith is reading between the lines

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

  • If hosts are routinely more extended, deeper IFU or adaptive-optics imaging should resolve blue light around most LRDs once engine contrast is accounted for.
  • The central [O III] equivalent-width dip is a practical locator for the engine even when the continuum is barely resolved.
  • Single-atmosphere models that put continuum and lines in one dense structure would need to reproduce the observed spatial offset between blue/narrow and red/broad components.
  • Merger-like companions around at least one target imply that some extended narrow-line gas may be environmental rather than a settled host disk.

Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, simulated authors' rebuttal, and a circularity audit.

Referee Report

3 major / 7 minor

Summary. This paper presents JWST/NIRSpec IFU spectroscopy (PRISM + G395H) of five broad-Hα-selected Little Red Dots at z∼5 and performs a spaxel-by-spaxel spectral decomposition into a blue continuum, a red continuum, narrow emission lines ([O III], Hα, Hβ), broad Balmer emission, and Balmer absorption. Intensity and kinematic maps, wavelength-dependent half-light radii, radial surface-brightness profiles compared to STPSF models, and [O III] equivalent-width maps are used to test a two-component picture. The authors report that the blue continuum is co-spatial with the narrow-line region, while the red continuum is compact and co-spatial with broad Balmer emission and absorption, with a central dip in EW[O III]. They conclude that LRD emission arises from at least two distinct physical components: a red central engine embedded in a blue host galaxy.

Significance. If the spatial associations hold, the work supplies direct IFU evidence for a composite (central engine + host) interpretation of LRDs, moving the debate beyond integrated spectra and broadband imaging. The combination of continuum decomposition, line decomposition, PSF comparisons, and EW[O III] maps for the same targets is a clear observational advance. The result is falsifiable with deeper IFU data or larger samples and is already partially stress-tested by the authors via two continuum models that yield similar maps. Limitations (N=5, marginal resolution in two objects, companion contamination in GS-13971) reduce generality but do not erase the co-spatiality signal in the better-resolved systems. The paper is a useful contribution to the high-z AGN/host literature.

major comments (3)
  1. [§4.1, §5, Abstract] §4.1 and §5: The central claim is stated for the sample as a whole, yet the text itself reports that GS-13971, GN-12839, and (to a lesser extent) GN-16813 show extended blue continuum and [O III], while GN-9771 and GN-15498 have comparable blue/red sizes and compact narrow-line morphologies. The abstract and summary should more carefully qualify that the morphological separation is clear in a subset of the sample and only marginally resolved or continuum-dominated in the rest, so that the two-component spatial picture is not over-generalized from the three clearer targets.
  2. [§3.1, §5] §3.1 and §5: The continuum decomposition (power-law + modified blackbody, or fixed Black Hole Star + host templates) is load-bearing for the blue/red maps. The paper notes that both models give similar maps and that some blue continuum may still originate from the central engine, but it does not quantify residual mixing (e.g., via mock IFU cubes with known host/engine fractions, or by reporting the fractional blue flux that could be reassigned to the engine without erasing the R1/2 or co-spatiality trends). A short robustness test or explicit upper bound on residual engine contribution to the blue maps would strengthen the claim that the extended blue light is host-dominated.
  3. [Appendix B, §4.2, Figure 3] Appendix B / GS-13971: Extended [O III] and blue continuum around this object include at least four narrow-line companions, and the authors favor a merger interpretation over a single large rotating host. Because GS-13971 is presented as the clearest extended case (Figures 3, 5, 6), the main text should state more explicitly how much of the extended narrow-line and blue continuum flux is attributed to companions versus a genuine host, and whether the co-spatiality argument for this target survives after companion masking. Without that, the strongest morphological example partially rests on a system that may not be a clean host+engine geometry.
minor comments (7)
  1. [Figure 1, Table 1] Figure 1 caption and ordering: spectra are ordered by UV prominence; a quantitative UV-to-optical continuum ratio or rest-UV slope in Table 1 would make that ordering reproducible.
  2. [§3.1, Eq. (1)] Eq. (1): the prior on α is written as (0, −5); clarify whether this is an open interval and the intended sign convention for a blue continuum (typically α < 0 in Fλ ∝ λ^α).
  3. [§3.2] GN-12839 Hα truncation: the chip-gap handling (tied narrow/broad velocity offsets) is described, but the impact on the broad-Hα intensity map and FWHM should be stated quantitatively (e.g., recovered fraction of the line profile).
  4. [§4.1, Figure 4] Figure 4: R1/2 uncertainties are 16–84th percentiles of the curve-of-growth; specify whether these include only measurement noise or also continuum-model parameter uncertainty.
  5. [Figure 6] Figure 6 radial EW[O III] panel: profiles are normalized for comparison; also show absolute EW scales (or a second panel) so the depth of the central dip can be compared across targets in physical units.
  6. [Abstract, throughout] Typographical consistency: “z~5” vs “z∼5”, “[Oiii]” vs “[O III]”, and “Ha” vs “Hα” appear in mixed forms in the abstract and body; standardize to journal style.
  7. [§1, §3.1] References to overlapping-author continuum models (Sun et al. 2026; Naidu et al. 2025) are appropriate, but a brief sentence distinguishing what is newly measured here (spatial maps, EW rings) from what is assumed from those works would help non-specialist readers.

Circularity Check

1 steps flagged

Minor self-citation of the two-component (central-engine + host) picture being tested; spatial maps and EW profiles remain independent observables from new IFU data.

specific steps
  1. self citation load bearing [Abstract and §1 (Introduction)]
    "recent studies propose that they arise from a compact central engine likely hosting a rapidly growing black hole embedded within a more extended host galaxy. We test this central engine + host galaxy model... Our work provides further evidence that the LRD emission is produced by at least two distinct physical components arising from a red central engine embedded within a blue host galaxy."

    The two-component picture that the paper sets out to test is drawn from prior works whose author lists substantially overlap with the present paper (Naidu, Sun, Matthee, Torralba et al.). This is ordinary self-citation of a working hypothesis rather than a load-bearing uniqueness claim or a result forced by definition; the new IFU maps supply independent spatial evidence. Flagged only as minor because the premise itself is not derived here.

full rationale

The paper does not claim a first-principles derivation of the two-component model. It explicitly frames the work as a test of a picture already proposed in recent literature (including papers with author overlap such as Naidu et al. 2025, Sun et al. 2026, Matthee et al. 2026). Continuum decompositions use either a simple power-law + modified blackbody or fixed empirical templates from the overlapping literature; both are stated to yield similar maps, and the key results are the measured co-spatiality of independently fitted components (compact red continuum with broad Hα/absorption versus more extended blue continuum with narrow [O III]/Hα) plus the central dip in EW[O III] (Figs. 3–6). These are direct products of spaxel-by-spaxel Gaussian fits and curve-of-growth size measurements on new NIRSpec IFU cubes, not quantities forced by construction from the input model. No uniqueness theorem, fitted parameter renamed as prediction, or self-definitional loop appears. The residual-mixing caveat already noted by the authors (Sec. 5) is an acknowledged limitation, not circularity. Score 2 reflects only the non-load-bearing self-citation of the model under test; the observational chain is self-contained.

Axiom & Free-Parameter Ledger

3 free parameters · 3 axioms · 0 invented entities

The central claim rests on standard IFU reduction and Gaussian line modeling plus two continuum parameterizations whose free parameters are fitted per spaxel. No new physical entities are introduced; the 'central engine' and 'host' are interpretive labels for the observed compact red and extended blue components. Cosmology and vacuum wavelengths are conventional.

free parameters (3)
  • power-law index α and blackbody temperature T (plus amplitudes APL, ABB and slope β)
    Fitted independently at each spaxel to the PRISM continuum after masking emission lines; priors α ∈ (0,−5), T ∈ (10^3,10^5) K. Maps and size comparisons depend on these fits.
  • Gaussian peak flux, velocity offset Δv, and dispersion σv for each narrow/broad/absorption component
    Fitted per spaxel with LMFIT; intensity and kinematic maps are direct products of these free parameters.
  • SNR > 3 spaxel cut and fixed 0.1″ systemic-redshift aperture
    Ad-hoc thresholds that define which spatial pixels enter the maps and the systemic redshift used for all velocity fits.
axioms (3)
  • domain assumption Emission and absorption lines are well-described by independent Gaussian profiles in velocity space relative to a single systemic redshift fixed from [O III].
    Stated in Section 3; underpins all kinematic and intensity maps.
  • ad hoc to paper The observed continuum can be decomposed into a blue power-law (or star-forming galaxy template) plus a red modified blackbody (or Black Hole Star template) without requiring additional continuum components.
    Section 3.1; the two models are chosen to match prior LRD phenomenology and are not uniquely required by the data.
  • standard math ΛCDM cosmology with h=0.7, ΩM=0.3, ΩΛ=0.7 and vacuum wavelengths.
    Stated at end of Introduction; used only for physical scales, not for the qualitative co-spatiality claim.

pith-pipeline@v1.1.0-grok45 · 21035 in / 2576 out tokens · 28884 ms · 2026-07-13T01:28:14.356915+00:00 · methodology

0 comments
read the original abstract

Little Red Dots (LRDs) are a population of compact red sources discovered by the James Webb Space Telescope (JWST). Imaging and spectroscopy have shown that LRDs exhibit a complex spectrum with a ``V-shaped" continuum, broad Balmer emission lines, and in some cases Balmer absorption. While the physical origin of these components remains debated, recent studies propose that they arise from a compact central engine likely hosting a rapidly growing black hole embedded within a more extended host galaxy. We test this central engine + host galaxy model using JWST/NIRSpec integral field unit (IFU) spectroscopy to spectrally decompose the observed continuum, narrow and broad emission lines, and absorption. We spatially map each component for five broad Ha-selected LRDs at z~5 observed with both the prism and high-resolution G395H grating. We find that the blue continuum emission is co-spatial with the narrow emission line region, while the red continuum arises from a compact core co-spatial with the broad Balmer emission and absorption. Spatial maps of the [OIII] equivalent width reveal a pronounced decrease in the central core. Our work provides further evidence that the LRD emission is produced by at least two distinct physical components arising from a red central engine embedded within a blue host galaxy.

Figures

Figures reproduced from arXiv: 2607.09647 by Alberto Torralba, Anna-Christina Eilers, Jenny E. Greene, John Chisholm, John R. Weaver, Jorryt Matthee, Mengyuan Xiao, Pascal A. Oesch, Rohan P. Naidu, Rongmon Bordoloi, Stijn Wuyts, Wendy Q. Sun, Yilun Ma, Yuzo Ishikawa.

Figure 1
Figure 1. Figure 1: Aperture spectra, extracted within r = 0.1 ′′ with the PRISM mode, centered on each LRD reveals a diversity in their continuum shapes. Most notably, the characteris￾tic V-shape becomes progressively less pronounced as the prominence of the rest-UV component increases. We show the sample spectra in order of UV prominence and notable emission lines. R1/2, defined as the radius enclosing 50% of the to￾tal flu… view at source ↗
Figure 2
Figure 2. Figure 2: We show sample fits of the PRISM continuum (left) and G395H spectral line fits around Hβ-[O iii] (center) and Hα (right) for each target. The PRISM continuum is fit with a two-component model: blue powerlaw and red blackbody. The narrow lines are shown in blue, and the broad lines and absorption are shown in red. Since the Hα profile of GN-12839 initially fell into the NIRSpec chip gap, the target was offs… view at source ↗
Figure 3
Figure 3. Figure 3: We show the integrated intensity maps of the blue continuum (top left), narrow Hα emission (top center), the narrow [O iii] emission (top right), red continuum (bottom left), and the broad Hα emission (bottom center) for GS-13971. We also show the EWHα,abs map of the Hα absorption (bottom right). All maps are constructed from spaxels with SNR > 3. The cross indicates the centroid location of the LRD. serve… view at source ↗
Figure 4
Figure 4. Figure 4: We show the wavelength-dependent R1/2 measurements of the blue continuum and the red continuum, measured within ∆λ ≈ 0.75 µm bins. We find that the red component is unresolved and the blue component is extended. We also compare the convolved theoretical PSF at each wavelength bin, measured with STPSF (WebbPSF). We have presented JWST/NIRSpec IFU observa￾tions of five LRDs using the NIRSpec IFU with the PRI… view at source ↗
Figure 5
Figure 5. Figure 5: We show normalized radial surface brightness profiles of the narrow-line emission (Hα and [O iii] in blue/purple) and the broad-line Hα emission (red). We compare the intensity profiles with the theoretical JWST PSF profiles shown in shaded gray. We find that the broad Hα is consistently compact, whereas the [O iii] shows both compact and extended sizes. This work is based on observations made with the NAS… view at source ↗
Figure 6
Figure 6. Figure 6: We show [O iii] equivalent width maps for all targets, zoomed in so that each box represents 1.5 ′′ × 1.5 ′′. All targets show a non-monotonic radial profile with a central dip or plateau in EW[O iii] , where the underlying red continuum is stronger than the [O iii] emission, followed by a slight increase in [O iii] emission, before radially decreasing outward shown in the radial EW[O iii] profile (bottom … view at source ↗
Figure 7
Figure 7. Figure 7: We show the spatial intensity maps of GN-9771. The panel layout and descriptions are identical to those in [PITH_FULL_IMAGE:figures/full_fig_p014_7.png] view at source ↗
Figure 8
Figure 8. Figure 8: Same as [PITH_FULL_IMAGE:figures/full_fig_p015_8.png] view at source ↗
Figure 9
Figure 9. Figure 9: Same as [PITH_FULL_IMAGE:figures/full_fig_p015_9.png] view at source ↗
Figure 10
Figure 10. Figure 10: Same as [PITH_FULL_IMAGE:figures/full_fig_p016_10.png] view at source ↗
Figure 11
Figure 11. Figure 11: We show the [O iii] velocity map of GS-13971. We also show the observed aperture spectra, in linear scale, of the central LRD (marked by a black cross) and the four companions. The closest companions (Comp 1 and Comp 2) show distinct continuum and emission lines (e.g. Lyα, [O iii], and Hα) from the central LRD. We also show the EW[O iii] values corresponding to the central LRD, Comp 1, and Comp 2 aperture… view at source ↗

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Reference graph

Works this paper leans on

300 extracted references · 39 canonical work pages · 7 internal anchors

  1. [1]

    , month =

    THE SEVENTH DATA RELEASE OF THE SLOAN DIGITAL SKY SURVEY , url =. , month =. doi:10.1088/0067-0049/182/2/543 , issn =

    doi:10.1088/0067-0049/182/2/543

  2. [2]

    Beyond the Local Volume. I. Surface Densities of Ultracool Dwarfs in Deep HST/WFC3 Parallel Fields , url =. , month =. doi:10.3847/1538-4357/ac35ea , issn =

    doi:10.3847/1538-4357/ac35ea

  3. [3]

    , month =

    Spectroscopy and high-resolution imaging of the gravitational lens SDSS J1206+4332 , volume =. , month =. doi:10.1093/mnras/stw529 , issn =

    work page doi:10.1093/mnras/stw529

  4. [4]

    , month =

    Discovery and first models of the quadruply lensed quasar SDSS J1433+6007 , url =. , month =. doi:10.1093/mnras/stx2950 , issn =

    doi:10.1093/mnras/stx2950

  5. [5]

    , month =

    THE NINTH DATA RELEASE OF THE SLOAN DIGITAL SKY SURVEY: FIRST SPECTROSCOPIC DATA FROM THE SDSS-III BARYON OSCILLATION SPECTROSCOPIC SURVEY , url =. , month =. doi:10.1088/0067-0049/203/2/21 , issn =

    doi:10.1088/0067-0049/203/2/21

  6. [6]

    , month =

    The 16th Data Release of the Sloan Digital Sky Surveys: First Release from the APOGEE-2 Southern Survey and Full Release of eBOSS Spectra , url =. , month =. doi:10.3847/1538-4365/ab929e , issn =

    doi:10.3847/1538-4365/ab929e

  7. [7]

    , keywords =

    COSMOS-Web: The Overabundance and Physical Nature of ``Little Red Dots'' Implications for Early Galaxy and SMBH Assembly. , keywords =. doi:10.3847/1538-4357/ade984 , archivePrefix =. 2406.10341 , primaryClass =

    Pith/arXiv arXiv doi:10.3847/1538-4357/ade984

  8. [8]

    , month =

    The. , month =. doi:10.1086/323540 , issn =

    work page doi:10.1086/323540

  9. [9]

    , keywords =

    What drives the growth of black holes?. , keywords =. doi:10.1016/j.newar.2011.11.003 , archivePrefix =. 1112.1949 , primaryClass =

    Pith/arXiv arXiv doi:10.1016/j.newar.2011.11.003 2011

  10. [10]

    , month =

    Candidate type II quasars at 2 < z < 4.3 in the Sloan Digital Sky Survey III , url =. , month =. doi:10.1093/mnras/stt1500 , issn =

    doi:10.1093/mnras/stt1500

  11. [11]

    , month =

    Spectropolarimetry of high-redshift obscured and red quasars , url =. , month =. doi:10.1093/mnras/sty1685 , issn =

    doi:10.1093/mnras/sty1685

  12. [12]

    Science , month =

    Gas flow and accretion via spiral streamers and circumstellar disks in a young binary protostar , url =. Science , month =. doi:10.1126/science.aaw3491 , issn =

    doi:10.1126/science.aaw3491

  13. [13]

    Nature Astronomy , month =

    Einstein rings modulated by wavelike dark matter from anomalies in gravitationally lensed images , url =. Nature Astronomy , month =. doi:10.1038/s41550-023-01943-9 , issn =

    doi:10.1038/s41550-023-01943-9

  14. [14]

    X-ray View of Little Red Dots: Do They Host Supermassive Black Holes? , year =

  15. [15]

    , month =

    Unified Models for Active Galactic Nuclei and Quasars , url =. , month =. doi:10.1146/annurev.aa.31.090193.002353 , issn =

    doi:10.1146/annurev.aa.31.090193.002353

  16. [16]

    arXiv e-prints , keywords =

    Laser Interferometer Space Antenna. arXiv e-prints , keywords =. doi:10.48550/arXiv.1702.00786 , archivePrefix =. 1702.00786 , primaryClass =

    Pith/arXiv arXiv doi:10.48550/arxiv.1702.00786

  17. [17]

    Astronomical Data Analysis Software and Systems V , editor =

    XSPEC: The First Ten Years , volume =. Astronomical Data Analysis Software and Systems V , editor =

  18. [18]

    SURVEY DESIGN, PHOTOMETRY, AND DEEP IRAC SOURCE COUNTS , url =

    SEDS: THE SPITZER EXTENDED DEEP SURVEY. SURVEY DESIGN, PHOTOMETRY, AND DEEP IRAC SOURCE COUNTS , url =. , month =. doi:10.1088/0004-637X/769/1/80 , issn =

    doi:10.1088/0004-637x/769/1/80

  19. [19]

    , month =

    HALF OF THE MOST LUMINOUS QUASARS MAY BE OBSCURED: INVESTIGATING THE NATURE OF WISE -SELECTED HOT DUST-OBSCURED GALAXIES , url =. , month =. doi:10.1088/0004-637X/804/1/27 , issn =

    doi:10.1088/0004-637x/804/1/27

  20. [20]

    , month =

    HOT DUST OBSCURED GALAXIES WITH EXCESS BLUE LIGHT: DUAL AGN OR SINGLE AGN UNDER EXTREME CONDITIONS? , url =. , month =. doi:10.3847/0004-637X/819/2/111 , issn =

    doi:10.3847/0004-637x/819/2/111

  21. [21]

    , month =

    Imaging Polarization of the Blue-excess Hot Dust-obscured Galaxy WISE J011601.41–050504.0 , url =. , month =. doi:10.3847/1538-4357/ac77fc , issn =

    doi:10.3847/1538-4357/ac77fc

  22. [22]

    , keywords =

    Astropy: A community Python package for astronomy. , keywords =. doi:10.1051/0004-6361/201322068 , archivePrefix =. 1307.6212 , primaryClass =

    Pith/arXiv arXiv doi:10.1051/0004-6361/201322068

  23. [23]

    , keywords =

    The Astropy Project: Building an Open-science Project and Status of the v2.0 Core Package. , keywords =. doi:10.3847/1538-3881/aabc4f , archivePrefix =. 1801.02634 , primaryClass =

    Pith/arXiv arXiv doi:10.3847/1538-3881/aabc4f

  24. [24]

    , keywords =

    The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package. , keywords =. doi:10.3847/1538-4357/ac7c74 , archivePrefix =. 2206.14220 , primaryClass =

    Pith/arXiv arXiv doi:10.3847/1538-4357/ac7c74

  25. [25]

    , month =

    The extreme faint end of the UV luminosity function at z 6 through gravitational telescopes: a comprehensive assessment of strong lensing uncertainties , url =. , month =. doi:10.1093/mnras/sty1820 , issn =

    doi:10.1093/mnras/sty1820

  26. [26]

    3D spectrography at high spatial resolution. I. Concept and realization of the integral field spectrograph TIGER. , url =. , month =

  27. [27]

    arXiv e-prints , keywords =

    (Re)solving the complex multi-scale morphology and V-shaped SED of a newly discovered strongly-lensed Little Red Dot in Abell 383. arXiv e-prints , keywords =. doi:10.48550/arXiv.2512.03239 , archivePrefix =. 2512.03239 , primaryClass =

    doi:10.48550/arxiv.2512.03239

  28. [28]

    , keywords =

    Connecting the Dots: UV-bright Companions of Little Red Dots as Lyman-Werner Sources Enabling Direct-collapse Black Hole Formation. , keywords =. doi:10.3847/2041-8213/ae58a5 , archivePrefix =. 2602.02702 , primaryClass =

    Pith/arXiv arXiv doi:10.3847/2041-8213/ae58a5 2041

  29. [29]

    ApJL , month =

    Getting a Kick Out of Numerical Relativity , volume =. ApJL , month =. doi:10.1086/510448 , issue =

    work page doi:10.1086/510448

  30. [30]

    Ground-based and Airborne Instrumentation for Astronomy IX , pages =

    A UV double pass spectrograph for monitoring stellar activity for the Keck Planet Finder , volume =. Ground-based and Airborne Instrumentation for Astronomy IX , pages =. doi:10.1117/12.2628149 , editor =

    work page doi:10.1117/12.2628149

  31. [31]

    , month =

    Classification parameters for the emission-line spectra of extragalactic objects , url =. , month =. doi:10.1086/130766 , issn =

    doi:10.1086/130766

  32. [32]

    , month =

    Primordial environment of supermassive black holes , url =. , month =. doi:10.1051/0004-6361/201730683 , issn =

    work page doi:10.1051/0004-6361/201730683

  33. [33]

    , month =

    New Spectral Model for Constraining Torus Covering Factors from Broadband X-Ray Spectra of Active Galactic Nuclei , url =. , month =. doi:10.3847/1538-4357/aaa7eb , issn =

    doi:10.3847/1538-4357/aaa7eb

  34. [34]

    Nature , month =

    An 800-million-solar-mass black hole in a significantly neutral Universe at a redshift of 7.5 , url =. Nature , month =. doi:10.1038/nature25180 , issn =

    doi:10.1038/nature25180

  35. [35]

    , month =

    Chandra X-Rays from the Redshift 7.54 Quasar ULAS J1342+0928 , url =. , month =. doi:10.3847/2041-8213/aab61e , issn =

    doi:10.3847/2041-8213/aab61e 2041

  36. [36]

    Evidence for significant obscured black hole growth at the highest quasar luminosities , url =

    Heavily reddened type 1 quasars at z > 2 – I. Evidence for significant obscured black hole growth at the highest quasar luminosities , url =. , month =. doi:10.1093/mnras/stu2649 , issn =

    doi:10.1093/mnras/stu2649

  37. [37]

    , volume =

    Dynamics of interacting galaxies. , volume =. doi:10.1146/annurev.aa.30.090192.003421 , journal =

    doi:10.1146/annurev.aa.30.090192.003421

  38. [38]

    , month =

    Formation of gas discs in merging galaxies , url =. , month =. doi:10.1046/j.1365-8711.2002.05335.x , issn =

    doi:10.1046/j.1365-8711.2002.05335.x 2002

  39. [39]

    , month =

    Tracing kinematic (mis)alignments in CALIFA merging galaxies , url =. , month =. doi:10.1051/0004-6361/201424935 , issn =

    doi:10.1051/0004-6361/201424935

  40. [40]

    , month =

    The CANDELS/SHARDS Multiwavelength Catalog in GOODS-N: Photometry, Photometric Redshifts, Stellar Masses, Emission-line Fluxes, and Star Formation Rates , url =. , month =. doi:10.3847/1538-4365/ab23f2 , issn =

    doi:10.3847/1538-4365/ab23f2

  41. [41]

    , keywords =

    From ``The Cliff'' to ``Virgil'': Mapping the Spectral Diversity of Little Red Dots with JWST/NIRSpec. , keywords =. doi:10.3847/1538-4357/ae5d2c , archivePrefix =. 2512.15853 , primaryClass =

    doi:10.3847/1538-4357/ae5d2c

  42. [42]

    , month =

    A Census of WISE-selected Dual and Offset AGNs Across the Sky: New Constraints on Merger-driven Triggering of Obscured AGNs , url =. , month =. doi:10.3847/1538-4357/acd2d3 , issn =

    doi:10.3847/1538-4357/acd2d3

  43. [43]

    ApJL , month =

    An Offset Seyfert 2 Nucleus in the Minor Merger System NGC 3341 , volume =. ApJL , month =. doi:10.1086/591905 , issue =

    work page doi:10.1086/591905

  44. [44]

    , month =

    Hot dust and the near-infrared bump in the continuum spectra of quasars and active galactic nuclei , url =. , month =. doi:10.1086/165571 , issn =

    doi:10.1086/165571

  45. [45]

    , month =

    THE PHYSICAL CONDITIONS, METALLICITY AND METAL ABUNDANCE RATIOS IN A HIGHLY MAGNIFIED GALAXY AT z = 3.6252 , url =. , month =. doi:10.1088/0004-637X/790/2/144 , issn =

    doi:10.1088/0004-637x/790/2/144

  46. [46]

    , month =

    INTEGRAL and XMM‐Newton Spectral Studies of NGC 4388 , url =. , month =. doi:10.1086/423708 , issn =

    work page doi:10.1086/423708

  47. [47]

    Nature , month =

    Massive black hole binaries in active galactic nuclei , volume =. Nature , month =. doi:10.1038/287307a0 , issue =

    doi:10.1038/287307a0

  48. [48]

    , keywords =

    Quasi-stars: accreting black holes inside massive envelopes. , keywords =. doi:10.1111/j.1365-2966.2008.13344.x , archivePrefix =. 0711.4078 , primaryClass =

    doi:10.1111/j.1365-2966.2008.13344.x 2008

  49. [49]

    , keywords =

    Evolution of supermassive stars as a pathway to black hole formation. , keywords =. doi:10.1111/j.1365-2966.2009.15916.x , archivePrefix =. 0910.4398 , primaryClass =

    doi:10.1111/j.1365-2966.2009.15916.x 2009

  50. [50]

    , keywords =

    Little Red Dots as Late-stage Quasi-stars. , keywords =. doi:10.3847/1538-4357/ae274a , archivePrefix =. 2507.09085 , primaryClass =

    doi:10.3847/1538-4357/ae274a

  51. [51]

    , month =

    Estimating Star Formation Rates from Infrared and Radio Luminosities: The Origin of the Radio‐Infrared Correlation , url =. , month =. doi:10.1086/367829 , issn =

    doi:10.1086/367829

  52. [52]

    , month =

    HI4PI: a full-sky H i survey based on EBHIS and GASS , url =. , month =. doi:10.1051/0004-6361/201629178 , issn =

    doi:10.1051/0004-6361/201629178

  53. [53]

    A Local Baseline of the Black Hole Mass Scaling Relations for Active Galaxies. IV. Correlations Between M _. , month =. doi:10.3847/1538-4357/ac151a , issn =

    doi:10.3847/1538-4357/ac151a

  54. [54]

    Astronomy and Astrophysics Supplement Series , month =

    SExtractor: Software for source extraction , url =. Astronomy and Astrophysics Supplement Series , month =. doi:10.1051/aas:1996164 , issn =

    doi:10.1051/aas:1996164

  55. [55]

    , month =

    Chandra unveils a binary active galactic nucleus in Mrk 463 , volume =. , month =. doi:10.1111/j.1365-2966.2008.13078.x , issn =

    doi:10.1111/j.1365-2966.2008.13078.x 2008

  56. [56]

    , month =

    The WIRCam Deep Survey , url =. , month =. doi:10.1051/0004-6361/201118547 , issn =

    doi:10.1051/0004-6361/201118547

  57. [57]

    Galactic Dynamics: Second Edition , year =

  58. [58]

    , month =

    The ASTRID simulation: galaxy formation and reionization , url =. , month =. doi:10.1093/mnras/stac648 , issn =

    doi:10.1093/mnras/stac648

  59. [59]

    Physics of the Dark Universe , month =

    lenstronomy: Multi-purpose gravitational lens modelling software package , volume =. Physics of the Dark Universe , month =. doi:10.1016/j.dark.2018.11.002 , issn =

    doi:10.1016/j.dark.2018.11.002 2018

  60. [60]

    Journal of Open Source Software , month =

    lenstronomy II: A gravitational lensing software ecosystem , volume =. Journal of Open Source Software , month =. doi:10.21105/joss.03283 , issn =

    doi:10.21105/joss.03283

  61. [61]

    , month =

    The WISSH quasars project , url =. , month =. doi:10.1051/0004-6361/201629301 , issn =

    doi:10.1051/0004-6361/201629301

  62. [62]

    , month =

    HE 1113-0641: THE SMALLEST-SEPARATION QUADRUPLE LENS IDENTIFIED BY A GROUND-BASED OPTICAL TELESCOPE , volume =. , month =. doi:10.1088/0004-6256/135/1/374 , issn =

    work page doi:10.1088/0004-6256/135/1/374

  63. [63]

    ApJ , month =

    The Kozai Mechanism and the Evolution of Binary Supermassive Black Holes , volume =. ApJ , month =. doi:10.1086/342655 , issue =

    doi:10.1086/342655

  64. [64]

    , month =

    The power of infrared AGN selection in mergers: a theoretical study , url =. , month =. doi:10.1093/mnras/sty1274 , issn =

    doi:10.1093/mnras/sty1274

  65. [65]

    Nature , month =

    The inevitable youthfulness of known high-redshift radio galaxies , volume =. Nature , month =. doi:10.1038/20612 , issn =

    doi:10.1038/20612

  66. [66]

    , month =

    Techniques and Review of Absolute Flux Calibration from the Ultraviolet to the Mid-Infrared , url =. , month =. doi:10.1086/677655 , issn =

    doi:10.1086/677655

  67. [67]

    , month =

    THE CALSPEC STARS P177D AND P330E , url =. , month =. doi:10.1088/0004-6256/149/4/122 , issn =

    doi:10.1088/0004-6256/149/4/122

  68. [68]

    Update of the STIS CTE Correction Formula for Stellar Spectra , year =

  69. [69]

    , month =

    The Near-Infrared Spectrograph (NIRSpec) on the James Webb Space Telescope , url =. , month =. doi:10.1051/0004-6361/202142589 , issn =

    doi:10.1051/0004-6361/202142589

  70. [70]

    , month =

    The CO-to-H _. , month =. doi:10.1146/annurev-astro-082812-140944 , issn =

    doi:10.1146/annurev-astro-082812-140944

  71. [71]

    , month =

    The emission-line properties of low-redshift quasi-stellar objects , url =. , month =. doi:10.1086/191661 , issn =

    doi:10.1086/191661

  72. [72]

    , month =

    Black Hole Mass and Eddington Ratio as Drivers for the Observable Properties of Radio‐loud and Radio‐quiet QSOs , url =. , month =. doi:10.1086/324486 , issn =

    doi:10.1086/324486

  73. [73]

    , month =

    AN OBSERVED LINK BETWEEN ACTIVE GALACTIC NUCLEI AND VIOLENT DISK INSTABILITIES IN HIGH-REDSHIFT GALAXIES , url =. , month =. doi:10.1088/0004-637X/757/1/81 , issn =

    work page doi:10.1088/0004-637x/757/1/81

  74. [74]

    , month =

    UV-CONTINUUM SLOPES OF > 4000 z 4-8 GALAXIES FROM THE HUDF/XDF, HUDF09, ERS, CANDELS-SOUTH, AND CANDELS-NORTH FIELDS , url =. , month =. doi:10.1088/0004-637X/793/2/115 , issn =

    doi:10.1088/0004-637x/793/2/115

  75. [75]

    , month =

    UV LUMINOSITY FUNCTIONS AT REDSHIFTS z 4 TO z 10: 10,000 GALAXIES FROM HST LEGACY FIELDS , url =. , month =. doi:10.1088/0004-637X/803/1/34 , issn =

    doi:10.1088/0004-637x/803/1/34

  76. [76]

    , month =

    The z 6 Luminosity Function Fainter than −15 mag from the Hubble Frontier Fields: The Impact of Magnification Uncertainties , url =. , month =. doi:10.3847/1538-4357/aa70a4 , issn =

    doi:10.3847/1538-4357/aa70a4

  77. [77]

    , month =

    Newly Discovered Bright z 9–10 Galaxies and Improved Constraints on Their Prevalence Using the Full CANDELS Area , url =. , month =. doi:10.3847/1538-4357/ab24c5 , issn =

    doi:10.3847/1538-4357/ab24c5

  78. [78]

    , month =

    New Determinations of the UV Luminosity Functions from z 9 to 2 Show a Remarkable Consistency with Halo Growth and a Constant Star Formation Efficiency , url =. , month =. doi:10.3847/1538-3881/abf83e , issn =

    doi:10.3847/1538-3881/abf83e

  79. [79]

    , month =

    A lack of evolution in the very bright end of the galaxy luminosity function from z 8 to 10 , url =. , month =. doi:10.1093/mnras/staa313 , issn =

    doi:10.1093/mnras/staa313

  80. [80]

    , month =

    The cosmological evolution of the QSO luminosity density and of the star formation rate , url =. , month =. doi:10.1046/j.1365-8711.1998.01264.x , issn =

    doi:10.1046/j.1365-8711.1998.01264.x 1998

Showing first 80 references.