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Star-forming fractions and galaxy evolution with redshift in rich X-ray-selected galaxy clusters

Nantais, Julie B. and Rettura, Alessandro and Lidman, Chris and Demarco, Ricardo and Gobat, Raphael and Rosati, Piero and Jee, M. James (2013) Star-forming fractions and galaxy evolution with redshift in rich X-ray-selected galaxy clusters. Astronomy and Astrophysics, 556 . Art. No. A112. ISSN 0004-6361.

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We have compared stacked spectra of galaxies, grouped by environment and stellar mass, among 58 members of the redshift z = 1.24 galaxy cluster RDCS J1252.9-2927 (J1252.9) and 134 galaxies in the z = 0.84 cluster RX J0152.7-1357 (J0152.7). These two clusters are excellent laboratories to study how galaxies evolve from star-forming to passive at z ~ 1. We measured spectral indices and star-forming fractions for our density- and mass-based stacked spectra. The star-forming fraction among low-mass galaxies (<7 × 10^(10)M_⊙) is higher in J1252.9 than in J0152.7, at about 4σ significance. Thus star formation is being quenched between z = 1.24 and z = 0.84 for a substantial fraction of low-mass galaxies. Star-forming fractions were also found to be higher in J1252.9 in all environments, including the core. Passive galaxies in J1252.9 have systematically lower D_n4000 values than in J0152.7 in all density and mass groups, consistent with passive evolution at modestly super-solar metallicities.

Item Type:Article
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URLURL TypeDescription DOIArticle Paper
Rettura, Alessandro0000-0002-5615-256X
Lidman, Chris0000-0003-1731-0497
Demarco, Ricardo0000-0003-3921-2177
Additional Information:© 2013 ESO. Article published by EDP Sciences. Published online 06 August 2013. Received 10 May 2013. Accepted 12 June 2013. J.N. acknowledges the support provided by FONDECYT postdoctoral research grant # 3120233. R.D. gratefully acknowledges the support provided by the BASAL Center for Astrophysics and Associated Technologies (CATA), and by FONDECYT grant N. 1130528. C.L. is the recipient of an Australian Research Council Future Fellowship (program number FT0992259).
Funding AgencyGrant Number
BASAL Center for Astrophysics and Associated Technologies (CATA)UNSPECIFIED
Australian Research Council Future FellowshipFT0992259
Subject Keywords:galaxies: clusters: individual: RX J0152.7-1357; galaxies: clusters: individual: RDCS J1252.9-2927; galaxies: evolution; galaxies: clusters: general
Record Number:CaltechAUTHORS:20131007-131052649
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Official Citation:Star-forming fractions and galaxy evolution with redshift in rich X-ray-selected galaxy clusters Julie B. Nantais, Alessandro Rettura, Chris Lidman, Ricardo Demarco, Raphael Gobat, Piero Rosati and M. James Jee A&A 556 A112 (2013) DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:41716
Deposited By: Ruth Sustaita
Deposited On:07 Oct 2013 20:55
Last Modified:09 Mar 2020 13:19

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