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

Resultado de la investigación: Article

16 Citas (Scopus)

Resumen

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.

Idioma originalEnglish
Número de artículoA112
PublicaciónAstronomy and Astrophysics
Volumen556
DOI
EstadoPublished - 19 ago 2013

Huella dactilar

galaxies
stars
x rays
stellar mass
metallicity
star formation

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Citar esto

Nantais, Julie B. ; Rettura, Alessandro ; Lidman, Chris ; Demarco, Ricardo ; Gobat, Raphael ; Rosati, Piero ; James Jee, M. / Star-forming fractions and galaxy evolution with redshift in rich X-ray-selected galaxy clusters. En: Astronomy and Astrophysics. 2013 ; Vol. 556.
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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.",
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Star-forming fractions and galaxy evolution with redshift in rich X-ray-selected galaxy clusters. / Nantais, Julie B.; Rettura, Alessandro; Lidman, Chris; Demarco, Ricardo; Gobat, Raphael; Rosati, Piero; James Jee, M.

En: Astronomy and Astrophysics, Vol. 556, A112, 19.08.2013.

Resultado de la investigación: Article

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.

PY - 2013/8/19

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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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