Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 499, Issue 4, Pages 5022-5046Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa3147
Keywords
galaxies: groups: general; galaxies: haloes; quasars: absorption lines
Categories
Funding
- European Research Council (ERC) under the European Union [757535]
- Fondazione Cariplo [2018-2329]
- Swiss National Science Foundation [PP00P2 163824]
- Australian Research Council [DP130100568, DP170103470]
- European Organisation for Astronomical Research in the Southern Hemisphere under ESO programme [197.A-0384, 065.O-0299, 067.A-0022, 068.A-0461, 068.A-0492, 068.A-0600, 068.B-0115, 069.A-0613, 071.A-0067, 071.A-0114, 073.A-0071, 073.A-0653, 073.B-0787, 074.A-0306, 075.A-0464, 077.A-0166, 080.A-0482, 083.A-0042, 091.A-0833, 092.A-0011, 093.A-0575, 094.A-0280, 094.A-0131, 094.A-0585, 095.A-0200, 097.A-0089, 099.A-0159, 166.A-0106, 189.A-0424]
- BISNational E-infrastructure capital grant [ST/K00042X/1]
- STFC capital grants [ST/H008519/1, ST/K00087X/1]
- STFC DiRAC Operations grant [ST/K003267/1]
- Durham University
- Alfred P. Sloan Foundation
- U.S. Department of Energy Office of Science
- W. M. Keck Foundation
- National Aeronautics and Space Administration
- NASA ADAP [NNX10AE84G]
- NASA's Exoplanet Exploration Program
- STFC [ST/T001550/1, ST/L000636/1, ST/T001348/1, ST/T001569/1, ST/R001014/1, ST/P003400/1, ST/V002384/1, ST/V002376/1, ST/M006948/1, ST/M007073/1, ST/S003916/1, ST/R001006/1, ST/S003762/1, ST/M007006/1, ST/M007065/1, ST/T001372/1, ST/R00689X/1, ST/K00333X/1, ST/H008519/1, ST/V002635/1, ST/T00049X/1, ST/M007618/1, ST/R001049/1, ST/J005673/1, ST/P000673/1, ST/P002447/1, ST/M006530/1, ST/R000832/1] Funding Source: UKRI
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We present a study of the metal-enriched cool halo gas traced by MgII absorption around 228 galaxies at z similar to 0.8-1.5 within 28 quasar fields from the MUSE Analysis of Gas around Galaxies survey. We observe no significant evolution in the MgII equivalent width versus impact parameter relation and in theMg II covering fraction compared to surveys at z less than or similar to 0.5. The stellar mass, along with distance from galaxy centre, appears to be the dominant factor influencing the Mg II absorption around galaxies. With a sample that is 90 per cent complete down to a star formation rate of approximate to 0.1M(circle dot) yr(-1) and up to impact parameters approximate to 250-350 kpc from quasars, we find that the majority (67(-15+)(12) per cent or 14/21) of the Mg II absorption systems are associated with more than one galaxy. The complex distribution of metals in these richer environments adds substantial scatter to previously reported correlations. Multiple galaxy associations show on average five times stronger absorption and three times higher covering fraction within twice the virial radius than isolated galaxies. The dependence of MgII absorption on galaxy properties disfavours the scenario in which a widespread intragroup medium dominates the observed absorption. This leaves instead gravitational interactions among group members or hydrodynamic interactions of the galaxy haloes with the intragroup medium as favoured mechanisms to explain the observed enhancement in the Mg II absorption strength and cross-section in rich environments.
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