Baryon Cycles in the Biggest Galaxies

Donahue, Megan; Voit, G. Mark

doi:10.48550/arxiv.2204.08099

Cited by 2 publications

(1 citation statement)

References 600 publications

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“…The circumgalactic medium (CGM), a baryon reservoir surrounding galaxies, represents a critical interface in the galactic baryon cycle that drives galaxy evolution (see Tumlinson et al 2017;Donahue & Voit 2022 for recent reviews). The CGM is the reservoir that gathers both feedback energy and material ejected from galaxies, as well as accreting gas, which will feed star formation (e.g., Naab & Ostriker 2017).…”

Section: Introductionmentioning

confidence: 99%

The Cosmic Ultraviolet Baryon Survey (CUBS) V: on the thermodynamic properties of the cool circumgalactic medium at z ≲ 1

Chen

Rudie

et al. 2022

Monthly Notices of the Royal Astronomical Society

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This paper presents a systematic study of the photoionization and thermodynamic properties of the cool circumgalactic medium (CGM) as traced by rest-frame ultraviolet absorption lines around 26 galaxies at redshift z ≲ 1. The study utilizes both high-quality far-ultraviolet and optical spectra of background QSOs and deep galaxy redshift surveys to characterize the gas density, temperature, and pressure of individual absorbing components and to resolve their internal non-thermal motions. The derived gas density spans more than three decades, from $\log (n_{\rm H}/{{\rm cm^{-3}}}) \approx -4$ to −1, while the temperature of the gas is confined in a narrow range of log (T/K) ≈ 4.3 ± 0.3. In addition, a weak anticorrelation between gas density and temperature is observed, consistent with the expectation of the gas being in photoionization equilibrium. Furthermore, decomposing the observed line widths into thermal and non-thermal contributions reveals that more than 30 per cent of the components at z ≲ 1 exhibit line widths driven by non-thermal motions, in comparison to <20 per cent found at z ≈ 2–3. Attributing the observed non-thermal line widths to intra-clump turbulence, we find that massive quenched galaxies on average exhibit higher non-thermal broadening/turbulent energy in their CGM compared to star-forming galaxies at z ≲ 1. Finally, strong absorption features from multiple ions covering a wide range of ionization energy (e.g. from Mg ii to O iv) can be present simultaneously in a single absorption system with kinematically aligned component structure, but the inferred pressure in different phases may differ by a factor of ≈10.

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Section: Introductionmentioning

confidence: 99%

The Cosmic Ultraviolet Baryon Survey (CUBS) V: on the thermodynamic properties of the cool circumgalactic medium at z ≲ 1

Chen

Rudie

et al. 2022

Monthly Notices of the Royal Astronomical Society

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The Cosmic Ultraviolet Baryon Survey (CUBS) V: On the Thermodynamic Properties of the Cool Circumgalactic Medium at $z < 1$

Qu¹,

Chen²,

Rudie³

et al. 2022

Preprint

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This paper presents a systematic study of the photoionization and thermodynamic properties of the cool circumgalactic medium (CGM) as traced by rest-frame ultraviolet absorption lines around 26 galaxies at redshift 𝑧 1. The study utilizes both highquality far-ultraviolet and optical spectra of background QSOs and deep galaxy redshift surveys to characterize the gas density, temperature, and pressure of individual absorbing components and to resolve their internal non-thermal motions. The derived gas density spans more than three decades, from log(𝑛 H /cm −3 ) ≈ −4 to −1, while the temperature of the gas is confined in a narrow range of log(𝑇/K) ≈ 4.3 ± 0.3. In addition, a weak anti-correlation between gas density and temperature is observed, consistent with the expectation of the gas being in photoionization equilibrium. Furthermore, decomposing the observed line widths into thermal and non-thermal contributions reveals that more than 30% of the components at 𝑧 1 exhibit line widths driven by non-thermal motions, in comparison to < 20% found at 𝑧 ≈ 2-3. Attributing the observed non-thermal line widths to intra-clump turbulence, we find that massive quenched galaxies on average exhibit higher non-thermal broadening/turbulent energy in their CGM compared to star-forming galaxies at 𝑧 1. Finally, strong absorption features from multiple ions covering a wide range of ionization energy (e.g., from Mg to O ) can be present simultaneously in a single absorption system with kinematically aligned component structure, but the inferred pressure in different phases may differ by a factor of ≈ 10.

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Baryon Cycles in the Biggest Galaxies

Cited by 2 publications

References 600 publications

The Cosmic Ultraviolet Baryon Survey (CUBS) V: on the thermodynamic properties of the cool circumgalactic medium at z ≲ 1

The Cosmic Ultraviolet Baryon Survey (CUBS) V: on the thermodynamic properties of the cool circumgalactic medium at z ≲ 1

The Cosmic Ultraviolet Baryon Survey (CUBS) V: On the Thermodynamic Properties of the Cool Circumgalactic Medium at $z < 1$

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