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

Yara L. Jaffé, Marc A.W. Verheijen, Chris P. Haines, Hyein Yoon, Ryan Cybulski, María Montero-Castaño, Rory Smith, Aeree Chung, Boris Z. Deshev, Ximena Fernández, Jacqueline van Gorkom, Bianca M. Poggianti, Min S. Yun, Alexis Finoguenov, Graham P. Smith, Nobuhiro Okabe

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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.

Original languageEnglish
Pages (from-to)1202-1221
Number of pages20
JournalMonthly Notices of the Royal Astronomical Society
Volume461
Issue number2
DOIs
Publication statusPublished - 2016 Sep 11

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Jaffé, Y. L., Verheijen, M. A. W., Haines, C. P., Yoon, H., Cybulski, R., Montero-Castaño, M., Smith, R., Chung, A., Deshev, B. Z., Fernández, X., van Gorkom, J., Poggianti, B. M., Yun, M. S., Finoguenov, A., Smith, G. P., & Okabe, N. (2016). BUDHIES - III: The fate of H i and the quenching of galaxies in evolving environments. Monthly Notices of the Royal Astronomical Society, 461(2), 1202-1221. https://doi.org/10.1093/mnras/stw984