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 M⊙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.

Dutta, R., Fumagalli, M., Fossati, M., Lofthouse, E., Prochaska, J., Arrigoni&nbsp, et al. (2020). MUSE Analysis of Gas around Galaxies (MAGG) – II: metal-enriched halo gas around z ∼ 1 galaxies. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 499(4 (December 2020)), 5022-5046 [10.1093/mnras/staa3147].

MUSE Analysis of Gas around Galaxies (MAGG) – II: metal-enriched halo gas around z ∼ 1 galaxies

Dutta, Rajeshwari
;
Fumagalli, Michele;Fossati, Matteo;Lofthouse, Emma K;Cantalupo, Sebastiano;
2020

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 M⊙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.
Articolo in rivista - Articolo scientifico
Scientifica
galaxies: groups: general; galaxies: haloes; quasars: absorption lines
English
Dutta, R., Fumagalli, M., Fossati, M., Lofthouse, E., Prochaska, J., Arrigoni , et al. (2020). MUSE Analysis of Gas around Galaxies (MAGG) – II: metal-enriched halo gas around z ∼ 1 galaxies. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 499(4 (December 2020)), 5022-5046 [10.1093/mnras/staa3147].
Dutta, R; Fumagalli, M; Fossati, M; Lofthouse, E; Prochaska, J; Arrigoni , ; Battaia, F; Bielby, R; Cantalupo, S; Cooke, R; Murphy, M; O’Meara, J
File in questo prodotto:
File Dimensione Formato  
staa3147.pdf

Solo gestori archivio

Tipologia di allegato: Publisher’s Version (Version of Record, VoR)
Dimensione 4.24 MB
Formato Adobe PDF
4.24 MB Adobe PDF   Visualizza/Apri   Richiedi una copia

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/294026
Citazioni
  • Scopus 18
  • ???jsp.display-item.citation.isi??? 0
Social impact