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Galaxy populations in massive galaxy clusters to z=1.1: colour distribution, concentration, halo occupation number and red sequence fraction

Hennig, C; Mohr, JJ; Zenteno, A; Desai, S; Dietrich, JP; Bocquet, S; Strazzullo, V; ... Zhang, Y; + view all (2017) Galaxy populations in massive galaxy clusters to z=1.1: colour distribution, concentration, halo occupation number and red sequence fraction. Monthly Notices of the Royal Astronomical Society , 467 (4) pp. 4015-4035. 10.1093/mnras/stx175. Green open access

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Abstract

We study the galaxy populations in 74 Sunyaev–Zeldovich effect selected clusters from the South Pole Telescope survey, which have been imaged in the science verification phase of the Dark Energy Survey. The sample extends up to z ∼ 1.1 with 4 × 1014 M⊙ ≤ M200 ≤ 3 × 1015M⊙. Using the band containing the 4000 Å break and its redward neighbour, we study the colour–magnitude distributions of cluster galaxies to ∼m* + 2, finding that: (1)The intrinsic rest frame g − r colour width of the red sequence (RS) population is ∼0.03 out to z ∼ 0.85 with a preference for an increase to ∼0.07 at z = 1, and (2) the prominence of the RS declines beyond z ∼ 0.6. The spatial distribution of cluster galaxies is well described by the NFW profile out to 4R200 with a concentration of cg=3.59+0.20−0.18 cg=3.59−0.18+0.20 , 5.37+0.27−0.24 5.37−0.24+0.27 and 1.38+0.21−0.19 1.38−0.19+0.21 for the full, the RS and the blue non-RS populations, respectively, but with ∼40 per cent to 55 per cent cluster to cluster variation and no statistically significant redshift or mass trends. The number of galaxies within the virial region N200 exhibits a mass trend indicating that the number of galaxies per unit total mass is lower in the most massive clusters, and shows no significant redshift trend. The RS fraction within R200 is (68 ± 3) per cent at z = 0.46, varies from ∼55 per cent at z = 1 to ∼80 per cent at z = 0.1 and exhibits intrinsic variation among clusters of ∼14 per cent. We discuss a model that suggests that the observed redshift trend in RS fraction favours a transformation time-scale for infalling field galaxies to become RS galaxies of 2–3 Gyr.

Type: Article
Title: Galaxy populations in massive galaxy clusters to z=1.1: colour distribution, concentration, halo occupation number and red sequence fraction
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stx175
Publisher version: http://doi.org/10.1093/mnras/stx175
Language: English
Additional information: © 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Physical Sciences, Astronomy & Astrophysics, galaxies: clusters: general, galaxies: clusters: individual, galaxies: evolution, galaxies:formation, galaxies: luminosity function, mass function, SOUTH-POLE TELESCOPE, SIMILAR-TO 1, BARYON ACOUSTIC-OSCILLATIONS, SPT-SZ SURVEY, NEAR-INFRARED PROPERTIES, DIGITAL SKY SURVEY, K-BAND PROPERTIES, LUMINOSITY FUNCTION, MAGNITUDE RELATION, X-RAY
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
URI: https://discovery.ucl.ac.uk/id/eprint/1540730
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