BUDHIES - III: the fate of H I and the quenching of galaxies in evolving environments

Journal
Date Issued
2016
Author(s)
Jaffé, Yara L.
•
Verheijen, Marc A. W.
•
Haines, Chris P.
•
Yoon, Hyein
•
Cybulski, Ryan
•
Montero-Castaño, María
•
Smith, Rory
•
Chung, Aeree
•
Deshev, Boris Z.
•
Fernández, Ximena
•
van Gorkom, Jacqueline
•
•
Yun, Min S.
•
Finoguenov, Alexis
•
Smith, Graham P.
•
Okabe, Nobuhiro
DOI
Abstract
In a hierarchical Universe clusters grow via the accretion of galaxies from the field, groups and even other clusters. As this happens, galaxies can lose and/or consume their gas reservoirs via different mechanisms, eventually quenching their star formation. We explore the diverse environmental histories of galaxies through a multiwavelength study of the combined effect of ram-pressure stripping and group `processing' in Abell 963, a massive growing cluster at z = 0.2 from the Blind Ultra Deep H I Environmental Survey (BUDHIES). We incorporate hundreds of new optical redshifts (giving a total of 566 cluster members), as well as Subaru and XMM-Newton data from LoCuSS, to identify substructures and evaluate galaxy morphology, star formation activity, and H I content (via H I deficiencies and stacking) out to 3 × R200. We find that Abell 963 is being fed by at least seven groups, that contribute to the large number of passive galaxies outside the cluster core. More massive groups have a higher fraction of passive and H I-poor galaxies, while low-mass groups host younger (often interacting) galaxies. For cluster galaxies not associated with groups we corroborate our previous finding that H I gas (if any) is significantly stripped via ram-pressure during their first passage through the intracluster medium, and find mild evidence for a starburst associated with this event. In addition, we find an overabundance of morphologically peculiar and/or star-forming galaxies near the cluster core. We speculate that these arise from the effect of groups passing through the cluster (post-processing). Our study highlights the importance of environmental quenching and the complexity added by evolving environments.
Volume
461
Issue
2
Start page
1202
Uri
Url
Issn Identifier
0035-8711
Ads BibCode
2016MNRAS.461.1202J
Rights
open.access
File(s)
Loading...
Thumbnail Image
Name

stw984.pdf

Description
PDF editoriale
Size

4.03 MB

Format

Adobe PDF

Checksum (MD5)

8d0f829d333917255a1e756c7b775bb5