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

• Published in: Monthly Notices of the Royal Astronomical Society
• Main Authors: 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., Carretero, J., Chiu, I., d'Andrea, C.B., Dacosta, L.N., Diehl, H.T., Doel, P., Eifler, T.F., Evrard, A.E., Fausti-Neto, A., Fosalba, P., Frieman, J., Gangkofner, C., Gonzalez, A., Gruen, D., Gruendl, R.A., Gupta, N., Gutierrez, G., Honscheid, K., Hlavacek-Larrondo, J., James, D.J., Kuehn, K., Kuropatkin, N., Lahav, O., March, M., Marshall, J.L., Martini, P., Mcdonald, M., Melchior, P., Miller, C.J., Miquel, R., Neilsen, E., Nord, B., Ogando, R., Plazas, A.A., Reichardt, C., Romer, A.K., Rozo, E., Rykoff, E.S., Sanchez, E., Santiago, B., Schubnell, M., Sevilla-Noarbe, I., Smith, R.C., Soares-Santos, M., Sobreira, F., Stalder, B., Stanford, S.A., Suchyta, E., Swanson, M.E.C., Tarle, G., Thomas, D., Vikram, V., Walker, A.R., Zhang, Y.
• Other Authors: Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), DES
• Format: Article in Journal/Newspaper
• Language: English
• Published: HAL CCSD 2017
• Subjects: galaxies: clusters: general; galaxies: clusters: individual; galaxies: evolution; galaxies: formation; galaxies: luminosity function; mass function; [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]; South pole
• Online Access: https://hal.science/hal-01554955; https://doi.org/10.1093/mnras/stx175

International audience 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 × 10^15M_⊙. 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 $$c_{\mathrm{g}} = 3.59^{+0.20}_{-0.18}$$, $$5.37^{+0.27}_{-0.24}$$ and $$1.38^{+0.21}_{-0.19}$$ 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 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.