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Abstract
We present an analysis of galaxies in groups and clusters at 0.8 < z < 1.2, from the GCLASS and GEEC2 spectroscopic surveys. We compute a 'conversion fraction' fconvert that represents the fraction of galaxies that were prematurely quenched by their environment. For massive galaxies, Mstar > 1010.3M⊙, we find fconvert ~ 0.4 in the groups and ~ 0.6 in the clusters, similar to comparable measurements at z = 0. This means the time between first accretion into a more massive halo and final star formation quenching is tp ~ 2 Gyr. This is substantially longer than the estimated time required for a galaxy's star formation rate to become zero once it starts to decline, suggesting there is a long delay time during which little differential evolution occurs. In contrast with local observations we find evidence that this delay time-scale may depend on stellar mass, with tp approaching tHubble for Mstar ~ 109.5 M⊙. The result suggests that the delay time must not only be much shorter than it is today, but may also depend on stellar mass in a way that is not consistent with a simple evolution in proportion to the dynamical time. Instead, we find the data are well-matched by a model in which the decline in star formation is due to 'overconsumption', the exhaustion of a gas reservoir through star formation and expulsion via modest outflows in the absence of cosmological accretion. Dynamical gas removal processes, which are likely dominant in quenching newly accreted satellites today, may play only a secondary role at z = 1.
| Original language | English |
|---|---|
| Pages (from-to) | 4364-4376 |
| Number of pages | 13 |
| Journal | Royal Astronomical Society. Monthly Notices |
| Volume | 456 |
| Issue number | 4 |
| Early online date | 9 Jan 2016 |
| DOIs | |
| Publication status | Published - 11 Mar 2016 |
Bibliographical note
Export Date: 15 August 2017CODEN: MNRAA
Correspondence Address: Balogh, M.L.; Department of Physics and Astronomy, University of WaterlooCanada; email: [email protected]
Funding details: LCP, Library Company of Philadelphia
Funding details: MLB, Major League Baseball
Funding details: NOVA, Nurses Organization of Veterans Affairs
Funding details: NSERC, Natural Sciences and Engineering Research Council of Canada
Funding details: NWO, Nederlandse Organisatie voor Wetenschappelijk Onderzoek
Funding text: MLB would like to acknowledge generous support from NOVA and NWO visitor grants, as well as the excellent hospitality extended by the Sterrewacht of Leiden University, where this paper was mostly written during sabbatical leave from Waterloo. We are grateful to the SDSS, COSMOS and zCOSMOS teams for making their excellent data products publicly available. This research is supported by NSERC Discovery grants to MLB and LCP. RFJvdB acknowledges support from the Netherlands Organization for Scientific Research grant number 639.042.814, and the European Research Council FP7 grant number 340519. DJW acknowledges the support of the Deutsche Forschungsgemeinschaft via Project ID 3871/1-1. AF wishes to acknowledge Finnish Academy award, decision 266918.
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Keywords
- Galaxies: clusters: general
- Galaxies: evolution
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Birmingham Astrophysics : Consolidated Grant 2013-2016
Vecchio, A. (Principal Investigator), Ponman, T. (Co-Investigator), Freise, A. (Co-Investigator), Smith, G. (Co-Investigator), Speake, C. (Co-Investigator), Mandel, I. (Co-Investigator), Cruise, M. (Co-Investigator), Raychaudhury, S. (Co-Investigator) & Stevens, I. (Co-Investigator)
SCIENCE & TECHNOLOGY FACILITIES COUNCIL
1/04/13 → 30/09/16
Project: Research Councils