MUSE Analysis of Gas around Galaxies (MAGG) – II: metal-enriched halo gas around z ∼ 1 galaxies
- Dutta, Rajeshwari ORCID Centre for Extragalactic Astronomy, Durham University, South Road, Durham DH1 3LE, UK
- Fumagalli, Michele ORCID Dipartimento di Fisica G. Occhialini, Università degli Studi di Milano Bicocca, Piazza della Scienza 3, I-20126 Milano, Italy
- Fossati, Matteo ORCID Dipartimento di Fisica G. Occhialini, Università degli Studi di Milano Bicocca, Piazza della Scienza 3, I-20126 Milano, Italy
- Lofthouse, Emma K Dipartimento di Fisica G. Occhialini, Università degli Studi di Milano Bicocca, Piazza della Scienza 3, I-20126 Milano, Italy
- Prochaska, J Xavier Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), 5-1-5 Kashiwanoha, Kashiwa 277-8583, Japan
- Arrigoni Battaia, Fabrizio Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str 1, D-85748 Garching bei München, Germany
- Bielby, Richard M ORCID Institute for Data Science, Durham University, South Road, Durham DH1 3LE, UK
- Cantalupo, Sebastiano ORCID Department of Physics, ETH Zurich, Wolgang-Pauli-Strasse 27, CH-8093 Zurich, Switzerland
- Cooke, Ryan J ORCID Centre for Extragalactic Astronomy, Durham University, South Road, Durham DH1 3LE, UK
- Murphy, Michael T ORCID Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia
- O’Meara, John M W. M. Keck Observatory, 65-1120 Mamalahoa Hwy. Kamuela, HI 96743, USA
- 2020-10-12
Published in:
- Monthly Notices of the Royal Astronomical Society. - Oxford University Press (OUP). - 2020, vol. 499, no. 4, p. 5022-5046
English
ABSTRACT
We present a study of the metal-enriched cool halo gas traced by Mg ii absorption around 228 galaxies at z ∼ 0.8–1.5 within 28 quasar fields from the MUSE Analysis of Gas around Galaxies survey. We observe no significant evolution in the Mg ii equivalent width versus impact parameter relation and in the Mg ii covering fraction compared to surveys at z ≲ 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 ≈0.1 $\rm M_\odot yr^{-1}$ and up to impact parameters ≈250–350 kpc from quasars, we find that the majority ($67^{+12}_{-15}$ 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 Mg ii 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.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1093/mnras/staa3147
- ISSN 0035-8711
- Persistent URL
- https://sonar.ch/global/documents/274498
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