The colors of central and satellite galaxies in zCOSMOS out to z ≃ 0.8 and implications for quenching

C. Knobel, S. J. Lilly, K. Kovač, Y. Peng, T. J. Bschorr, C. M. Carollo, T. Contini, J. P. Kneib, O. Le Fevre, V. Mainieri, A. Renzini, M. Scodeggio, G. Zamorani, S. Bardelli, M. Bolzonella, A. Bongiorno, K. Caputi, O. Cucciati, S. De La Torre, L. De RavelP. Franzetti, B. Garilli, A. Iovino, P. Kampczyk, F. Lamareille, J. F. Le Borgne, V. Le Brun, C. Maier, M. Mignoli, R. Pello, E. Perez Montero, V. Presotto, J. Silverman, M. Tanaka, L. Tasca, L. Tresse, D. Vergani, E. Zucca, L. Barnes, R. Bordoloi, A. Cappi, A. Cimatti, G. Coppa, A. M. Koekemoer, C. López-Sanjuan, H. J. McCracken, M. Moresco, P. Nair, L. Pozzetti, N. Welikala

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

We examine the red fraction of central and satellite galaxies in the large zCOSMOS group catalog out to z ≃ 0.8, correcting for both the incompleteness in stellar mass and for the less than perfect purities of the central and satellite samples. We show that at all masses and at all redshifts, the fraction of satellite galaxies that have been quenched, i.e., that are red, is systematically higher than that of centrals, as seen locally in the Sloan Digital Sky Survey (SDSS). The satellite quenching efficiency, which is the probability that a satellite is quenched because it is a satellite rather than a central, is, as locally, independent of stellar mass. Furthermore, the average value is about 0.5, which is also very similar to that seen in the SDSS. We also construct the mass functions of blue and red centrals and satellites and show that these broadly follow the predictions of the Peng et al. analysis of the SDSS groups. Together, these results indicate that the effect of the group environment in quenching satellite galaxies was very similar to what it is today when the universe was about half its present age.

Original languageEnglish
Article number24
JournalAstrophysical Journal
Volume769
Issue number1
DOIs
Publication statusPublished - 2013 May 20

Keywords

  • cosmology: observations
  • galaxies: evolution
  • galaxies: groups: general
  • galaxies: luminosity function, mass function
  • galaxies: statistics

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'The colors of central and satellite galaxies in zCOSMOS out to z ≃ 0.8 and implications for quenching'. Together they form a unique fingerprint.

  • Cite this

    Knobel, C., Lilly, S. J., Kovač, K., Peng, Y., Bschorr, T. J., Carollo, C. M., Contini, T., Kneib, J. P., Le Fevre, O., Mainieri, V., Renzini, A., Scodeggio, M., Zamorani, G., Bardelli, S., Bolzonella, M., Bongiorno, A., Caputi, K., Cucciati, O., De La Torre, S., ... Welikala, N. (2013). The colors of central and satellite galaxies in zCOSMOS out to z ≃ 0.8 and implications for quenching. Astrophysical Journal, 769(1), [24]. https://doi.org/10.1088/0004-637X/769/1/24