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Clumpiness of Observed and Simulated Cold Circumgalactic Gas

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Ramona Augustin, Céline Péroux, Aleksandra Hamanowicz, Varsha Kulkarni, Hadi Rahmani, Anita Zanella

Astrophysics of Galaxies · Submitted 24 May 2021

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim Our joint approach combining 3D-spectroscopy observations of lensed systems and simulations with extreme resolution in the CGM put new constraints on the clumpiness of cold CGM gas, a key diagnostic of the baryon cycle.

how it is stated · hedged possibility 0.64 read the record →

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arXiv ID2105.11480 (version 1)
Pith IDVRMF735J, Pith's permanent record of this paper and its review
CitationAleksandra Hamanowicz, Anita Zanella, C\'eline P\'eroux, Hadi Rahmani, Ramona Augustin, Varsha Kulkarni. "Clumpiness of Observed and Simulated Cold Circumgalactic Gas." arXiv:2105.11480 (2021). https://pith.science/paper/VRMF735J
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The compiled record

The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

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Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 8,626 input tokens.

What the abstract itself states, as probabilities: claims first 0.05 · states limitation 0.10 · human participants 0.02 · controlled comparison 0.09 · randomized assignment 0.01 · states quantitative result 0.98 · compares with prior results 0.38 · mentions code or data availability 0.03.

The abstract, sentence by sentence

arXiv listing abstract v1. Results and the main claim are underlined; .

Determining the clumpiness of matter around galaxies is pivotal to a full understanding of the spatially inhomogeneous, multi-phase gas in the circumgalactic medium (CGM). We combine high spatially resolved 3D observations with hydrodynamical cosmological simulations to measure the cold circumgalactic gas clumpiness. We present new adaptive-optics-assisted VLT/MUSE observations of a quadruply lensed quasar, targeting the CGM of 2 foreground $z\sim$1 galaxies observed in absorption. We additionally use zoom-in FOGGIE simulations with exquisite resolution ($\sim$0.1 kpc scales) in the CGM of galaxies to compute the physical properties of cold gas traced by Mg\,II absorbers. By contrasting these mock-observables with the VLT/MUSE observations, we find a large spread of fractional variations of Mg\,II equivalent widths with physical separation, both in observations and simulations. The simulations indicate a dependence of the Mg\,II coherence length on the underlying gas morphology (filaments vs clumps). The $z_{\rm abs}$=1.168 Mg\,II system shows coherence over $\gtrsim$ 6 kpc and is associated with an [O\,II] emitting galaxy situated 89 kpc away, with SFR $\geq$ 4.6 $\pm$ {1.5} $\rm M_{\odot}$/yr and $M_{*}=10^{9.6\pm0.2} M_{\odot}$. Based on this combined analysis, we determine that the absorber is consistent with being an inflowing filament. The $z_{\rm abs}$=1.393 Mg\,II system traces dense CGM gas clumps varying in strength over $\lesssim$ 2 kpc physical scales. Our findings suggest that this absorber is likely related to an outflowing clump. Our joint approach combining 3D-spectroscopy observations of lensed systems and simulations with extreme resolution in the CGM put new constraints on the clumpiness of cold CGM gas, a key diagnostic of the baryon cycle.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 Determining the clumpiness of matter around galaxies is pivotal to a full understanding of the spatially inhomogeneous, multi-phase gas in the circumgalactic medium (CGM). background 1.00 0.04 0.03 asserted 1.00
s1 We combine high spatially resolved 3D observations with hydrodynamical cosmological simulations to measure the cold circumgalactic gas clumpiness. method 0.70 0.96 0.03 asserted 1.00
s2 We present new adaptive-optics-assisted VLT/MUSE observations of a quadruply lensed quasar, targeting the CGM of 2 foreground $z\sim$1 galaxies observed in absorption. method 0.77 0.95 0.02 asserted 0.98
s3 We additionally use zoom-in FOGGIE simulations with exquisite resolution ($\sim$0.1 kpc scales) in the CGM of galaxies to compute the physical properties of cold gas traced by Mg\,II absorbers. method 0.97 0.91 0.02 asserted 0.98
s4 By contrasting these mock-observables with the VLT/MUSE observations, we find a large spread of fractional variations of Mg\,II equivalent widths with physical separation, both in observations and simulations. result 1.00 0.96 0.16 asserted 1.00
s5 The simulations indicate a dependence of the Mg\,II coherence length on the underlying gas morphology (filaments vs clumps). result 0.87 0.79 0.11 hedged possibility 0.80
s6 The $z_{\rm abs}$=1.168 Mg\,II system shows coherence over $\gtrsim$ 6 kpc and is associated with an [O\,II] emitting galaxy situated 89 kpc away, with SFR $\geq$ 4.6 $\pm$ {1.5} $\rm M_{\odot}$/yr and $M_{*}=10^{9.6\pm0.2} M_{\odot}$. result 1.00 0.92 0.07 asserted 1.00
s7 Based on this combined analysis, we determine that the absorber is consistent with being an inflowing filament. interpretation 0.99 0.94 0.17 hedged possibility 0.99
s8 The $z_{\rm abs}$=1.393 Mg\,II system traces dense CGM gas clumps varying in strength over $\lesssim$ 2 kpc physical scales. result 1.00 0.93 0.09 asserted 1.00
s9 Our findings suggest that this absorber is likely related to an outflowing clump. interpretation 0.99 0.89 0.10 hedged possibility 1.00
s10 Our joint approach combining 3D-spectroscopy observations of lensed systems and simulations with extreme resolution in the CGM put new constraints on the clumpiness of cold CGM gas, a key diagnostic of the baryon cycle. contribution 0.79 0.91 0.59 hedged possibility 0.64

What kind of paper the classifier reports this is: empirical study 1.00 · evidence from observation or experiment 0.96.

What was examined, and what was not

sources read
  • arXiv listing abstract v1
not examined
  • full text
  • figures and tables
  • references and citing sentences
  • relations to other papers
levels run
  • P abstract
not run
  • S sections
  • T body sentences
  • C citations
  • R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper
Original abstract

Determining the clumpiness of matter around galaxies is pivotal to a full understanding of the spatially inhomogeneous, multi-phase gas in the circumgalactic medium (CGM). We combine high spatially resolved 3D observations with hydrodynamical cosmological simulations to measure the cold circumgalactic gas clumpiness. We present new adaptive-optics-assisted VLT/MUSE observations of a quadruply lensed quasar, targeting the CGM of 2 foreground $z\sim$1 galaxies observed in absorption. We additionally use zoom-in FOGGIE simulations with exquisite resolution ($\sim$0.1 kpc scales) in the CGM of galaxies to compute the physical properties of cold gas traced by Mg\,II absorbers. By contrasting these mock-observables with the VLT/MUSE observations, we find a large spread of fractional variations of Mg\,II equivalent widths with physical separation, both in observations and simulations. The simulations indicate a dependence of the Mg\,II coherence length on the underlying gas morphology (filaments vs clumps). The $z_{\rm abs}$=1.168 Mg\,II system shows coherence over $\gtrsim$ 6 kpc and is associated with an [O\,II] emitting galaxy situated 89 kpc away, with SFR $\geq$ 4.6 $\pm$ {1.5} $\rm M_{\odot}$/yr and $M_{*}=10^{9.6\pm0.2} M_{\odot}$. Based on this combined analysis, we determine that the absorber is consistent with being an inflowing filament. The $z_{\rm abs}$=1.393 Mg\,II system traces dense CGM gas clumps varying in strength over $\lesssim$ 2 kpc physical scales. Our findings suggest that this absorber is likely related to an outflowing clump. Our joint approach combining 3D-spectroscopy observations of lensed systems and simulations with extreme resolution in the CGM put new constraints on the clumpiness of cold CGM gas, a key diagnostic of the baryon cycle.

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References
How the literature uses it

3 arXiv papers cite this in 4 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

What it cites · 8 sentences without a confident label

Uses data or values from 1 paper
Compares with 1 paper
Cites as background 1 paper
  • The canonical view is that inflows preferentially occur along the major axis, while outflows are aligned with the minor axis, corresponding to the path of least resistance [ref] .

    2009.07809 · Mg II Absorber at $z_abs$=1.168 · 0.82

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