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; M. James Jee

doi:10.1051/0004-6361/201321877

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, M. James Jee

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20 Scopus citations

Abstract

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.

Original language	English
Article number	A112
Journal	Astronomy and Astrophysics
Volume	556
DOIs	https://doi.org/10.1051/0004-6361/201321877
State	Published - 2013
Externally published	Yes

Keywords

Galaxies: clusters: general
Galaxies: clusters: individual: RDCS J1252.9-2927
Galaxies: clusters: individual: RX J0152.7-1357
Galaxies: evolution

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@article{62436745f62b4a94a1203ad07ca7cd67,

title = "Star-forming fractions and galaxy evolution with redshift in rich X-ray-selected galaxy clusters",

abstract = "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.",

keywords = "Galaxies: clusters: general, Galaxies: clusters: individual: RDCS J1252.9-2927, Galaxies: clusters: individual: RX J0152.7-1357, Galaxies: evolution",

author = "Nantais, {Julie B.} and Alessandro Rettura and Chris Lidman and Ricardo Demarco and Raphael Gobat and Piero Rosati and {James Jee}, M.",

note = "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).",

year = "2013",

doi = "10.1051/0004-6361/201321877",

language = "English",

volume = "556",

journal = "Astronomy and Astrophysics",

issn = "0004-6361",

publisher = "EDP Sciences",

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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

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U2 - 10.1051/0004-6361/201321877

DO - 10.1051/0004-6361/201321877

M3 - Article

AN - SCOPUS:84881435248

SN - 0004-6361

VL - 556

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - A112

ER -

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

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Keywords

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