MUSE analysis of gas around galaxies (MAGG) – III. The gas and galaxy environment of z = 3–4.5 quasars

Fossati, M; Fumagalli, M; Lofthouse, EK; Dutta, R; Cantalupo, S; Arrigoni Battaia, F; Fynbo, JPU; Lusso, E; Murphy, MT; Prochaska, JX; Theuns, T; Cooke, RJ

Abstract

We present a study of the environment of 27 z = 3–4.5 bright quasars from the MUSE Analysis of Gas around Galaxies (MAGG) survey. With medium-depth Multi Unit Spectroscopic Explorer (MUSE) observations (4 h on target per field), we characterize the effects of quasars on their surroundings by studying simultaneously the properties of extended gas nebulae and Ly α emitters (LAEs) in the quasar host haloes. We detect extended (up to ≈100 kpc) Ly α emission around all MAGG quasars, finding a very weak redshift evolution between z = 3 and z = 6. By stacking the MUSE datacubes, we confidently detect extended emission of C IV and only marginally detect extended He II up to ≈40 kpc, implying that the gas is metal enriched. Moreover, our observations show a significant overdensity of LAEs within 300 km s−1 from the quasar systemic redshifts estimated from the nebular emission. The luminosity functions and equivalent width distributions of these LAEs show similar shapes with respect to LAEs away from quasars suggesting that the Ly α emission of the majority of these sources is not significantly boosted by the quasar radiation or other processes related to the quasar environment. Within this framework, the observed LAE overdensities and our kinematic measurements imply that bright quasars at z = 3–4.5 are hosted by haloes in the mass range ≈1012.0−−1012.5 M⊙⁠.

Citation

Fossati, M., Fumagalli, M., Lofthouse, E., Dutta, R., Cantalupo, S., Arrigoni Battaia, F., Fynbo, J., Lusso, E., Murphy, M., Prochaska, J., Theuns, T., & Cooke, R. (2021). MUSE analysis of gas around galaxies (MAGG) – III. The gas and galaxy environment of z = 3–4.5 quasars. Monthly Notices of the Royal Astronomical Society, 503(2), 3044-3064. https://doi.org/10.1093/mnras/stab660

• Journal Article Type: Article
• Acceptance Date: Mar 1, 2021
• Online Publication Date: Mar 8, 2021
• Publication Date: 2021-05
• Deposit Date: Jul 14, 2021
• Publicly Available Date: Jul 14, 2021
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Royal Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 503
• Issue: 2
• Pages: 3044-3064
• DOI: https://doi.org/10.1093/mnras/stab660
• Public URL: https://durham-repository.worktribe.com/output/1245568