Galaxy environments over cosmic time: The non-evolving radial galaxy distributions around massive galaxies since z = 1.6

Tomer Tal, Pieter G. Van Dokkum, Marijn Franx, Joel Leja, David A. Wake, Katherine E. Whitaker

Research output: Contribution to journalArticlepeer-review

21 Scopus citations

Abstract

We present a statistical study of the environments of massive galaxies in four redshift bins between z = 0.04 and z = 1.6, using data from the Sloan Digital Sky Survey and the NEWFIRM Medium Band Survey. We measure the projected radial distribution of galaxies in cylinders around a constant number density selected sample of massive galaxies and utilize a statistical subtraction of contaminating sources. Our analysis shows that massive primary galaxies typically live in group halos and are surrounded by 2-3 satellites with masses more than one-tenth of the primary galaxy mass. The cumulative stellar mass in these satellites roughly equals the mass of the primary galaxy itself. We further find that the radial number density profile of galaxies around massive primaries has not evolved significantly in either slope or overall normalization in the past 9.5 Gyr. A simplistic interpretation of this result can be taken as evidence for a lack of mergers in the studied groups and as support for a static evolution model of halos containing massive primaries. Alternatively, there exists a tight balance between mergers and accretion of new satellites such that the overall distribution of galaxies in and around the halo is preserved. The latter interpretation is supported by a comparison to a semi-analytic model, which shows a similar constant average satellite distribution over the same redshift range.

Original languageEnglish (US)
Article number31
JournalAstrophysical Journal
Volume769
Issue number1
DOIs
StatePublished - May 20 2013

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'Galaxy environments over cosmic time: The non-evolving radial galaxy distributions around massive galaxies since z = 1.6'. Together they form a unique fingerprint.

Cite this