Metal-enriched halo gas across galaxy overdensities over the last 10 billion years

Dutta, Rajeshwari and Fumagalli, Michele and Fossati, Matteo and Bielby, Richard M. and Stott, John P. and Lofthouse, Emma K. and Cantalupo, Sebastiano and Cullen, Fergus and Crain, Robert A. and Tripp, Todd M. and Prochaska, J. Xavier and Arrigoni Battaia, Fabrizio and Burchett, Joseph N. and Fynbo, Johan P. U. and Murphy, Michael T. and Schaye, Joop and Tejos, Nicolas and Theuns, Tom (2021) Metal-enriched halo gas across galaxy overdensities over the last 10 billion years. Monthly Notices of the Royal Astronomical Society, 508 (3). pp. 4573-4599. ISSN 0035-8711

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We present a study of metal-enriched halo gas traced by Mg II and C IV absorption at z <2 in the MUSE Analysis of Gas around Galaxies survey and the Quasar Sightline and Galaxy Evolution survey. Using these large and complete galaxy surveys in quasar fields, we study the dependence of the metal distribution on galaxy properties and overdensities, out to physical projected separations of 750 kpc. We find that the cool, low-ionization gas is significantly affected by the environment across the full redshift range probed, with ≍2-3 times more prevalent and stronger Mg II absorption in higher overdensity group environments and in regions with greater overall stellar mass and star formation rates. Complementary to these results, we have further investigated the more highly ionized gas as traced by C IV absorption, and found that it is likely to be more extended than the Mg II gas, with ≍2 times higher covering fraction at a given distance. We find that the strength and covering fraction of C IV absorption show less significant dependence on galaxy properties and environment than the Mg II absorption, but more massive and star-forming galaxies nevertheless also show ≍2 times higher incidence of C IV absorption. The incidence of Mg II and C IV absorption within the virial radius shows a tentative increase with redshift, being higher by a factor of ≍1.5 and ≍4, respectively, at z > 1. It is clear from our results that environmental processes have a significant impact on the distribution of metals around galaxies and need to be fully accounted for when analysing correlations between gaseous haloes and galaxy properties.

Item Type:
Journal Article
Journal or Publication Title:
Monthly Notices of the Royal Astronomical Society
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This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record Rajeshwari Dutta, Michele Fumagalli, Matteo Fossati, Richard M Bielby, John P Stott, Emma K Lofthouse, Sebastiano Cantalupo, Fergus Cullen, Robert A Crain, Todd M Tripp, J Xavier Prochaska, Fabrizio Arrigoni Battaia, Joseph N Burchett, Johan P U Fynbo, Michael T Murphy, Joop Schaye, Nicolas Tejos, Tom Theuns, Metal-enriched halo gas across galaxy overdensities over the last 10 billion years, Monthly Notices of the Royal Astronomical Society, Volume 508, Issue 3, December 2021, Pages 4573–4599, is available online at:
Uncontrolled Keywords:
?? galaxies: groups: generalgalaxies: haloesquasars: absorption linesastronomy and astrophysicsspace and planetary science ??
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Deposited On:
07 Mar 2022 15:15
Last Modified:
12 Feb 2024 00:45