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

C. Hennig, J. J. Mohr, A. Zenteno, S. Desai, J. P. Dietrich, S. Bocquet, V. Strazzullo, A. Saro, T. M.C. Abbott, F. B. Abdalla, M. Bayliss, A. Benoit-Lévy, R. A. Bernstein, E. Bertin, D. Brooks, R. Capasso, D. Capozzi, A. Carnero, M. Carrasco Kind, J. CarreteroI. Chiu, C. B. D’Andrea, L. N. daCosta, H. T. Diehl, P. Doel, T. F. Eifler, A. E. Evrard, A. Fausti-Neto, P. Fosalba, J. Frieman, C. Gangkofner, A. Gonzalez, D. Gruen, R. A. Gruendl, N. Gupta, G. Gutierrez, K. Honscheid, J. Hlavacek-Larrondo, D. J. James, K. Kuehn, N. Kuropatkin, O. Lahav, M. March, J. L. Marshall, P. Martini, M. McDonald, P. Melchior, C. J. Miller, R. Miquel, E. Neilsen, B. Nord, R. Ogando, A. A. Plazas, C. Reichardt, A. K. Romer, E. Rozo, E. S. Rykoff, E. Sanchez, B. Santiago, M. Schubnell, I. Sevilla-Noarbe, R. C. Smith, M. Soares-Santos, F. Sobreira, B. Stalder, S. A. Stanford, E. Suchyta, M. E.C. Swanson, G. Tarle, D. Thomas, V. Vikram, A. R. Walker, Y. Zhang

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22 Scopus citations

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 × 10 14 M ≤ M 200 ≤ 3 × 10 15 M. 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 4R 200 with a concentration of c g = 3.59 + 0 0 20 18 , 5.37 + 0 0 27 24 and 1.38 + 0 0 21 19 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 N 200 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 R 200 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

Original languageEnglish (US)
Pages (from-to)4015-4035
Number of pages21
JournalMonthly Notices of the Royal Astronomical Society
Volume467
Issue number4
DOIs
StatePublished - Jun 1 2017

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Hennig, C., Mohr, J. J., Zenteno, A., Desai, S., Dietrich, J. P., Bocquet, S., Strazzullo, V., Saro, A., Abbott, T. M. C., Abdalla, F. B., Bayliss, M., Benoit-Lévy, A., Bernstein, R. A., Bertin, E., Brooks, D., Capasso, R., Capozzi, D., Carnero, A., Carrasco Kind, M., ... Zhang, Y. (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), 4015-4035. https://doi.org/10.1093/mnras/stx175