TY - JOUR
T1 - Star-forming fractions and galaxy evolution with redshift in rich X-ray-selected galaxy clusters
AU - Nantais, Julie B.
AU - Rettura, Alessandro
AU - Lidman, Chris
AU - Demarco, Ricardo
AU - Gobat, Raphael
AU - Rosati, Piero
AU - James Jee, M.
N1 - Funding Information:
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).
PY - 2013
Y1 - 2013
N2 - 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 10M⊙) 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.
AB - 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 10M⊙) 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.
KW - Galaxies: clusters: general
KW - Galaxies: clusters: individual: RDCS J1252.9-2927
KW - Galaxies: clusters: individual: RX J0152.7-1357
KW - Galaxies: evolution
UR - http://www.scopus.com/inward/record.url?scp=84881435248&partnerID=8YFLogxK
U2 - 10.1051/0004-6361/201321877
DO - 10.1051/0004-6361/201321877
M3 - Article
AN - SCOPUS:84881435248
VL - 556
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
SN - 0004-6361
M1 - A112
ER -