On the intermediate-redshift central stellar mass-halo mass relation, and implications for the evolution of the most massive galaxies since z ∼ 1

Francesco Shankar, Hong Guo, Vincent Bouillot, Alessandro Rettura, Alan Meert, Stewart Buchan, Andrey Kravtsov, Mariangela Bernardi, Ravi Sheth, Vinu Vikram, Danilo Marchesini, Peter Behroozi, Zheng Zheng, Claudia Maraston, Begoña Ascaso, Brian C. Lemaux, Diego Capozzi, Marc Huertas-Company, Roy R. Gal, Lori M. LubinChristopher J. Conselice, Marcella Carollo, Andrea Cattaneo

Research output: Contribution to journalArticlepeer-review

38 Scopus citations

Abstract

The stellar mass-halo mass relation is a key constraint in all semi-analytic, numerical, and semi-empirical models of galaxy formation and evolution. However, its exact shape and redshift dependence remain under debate. Several recent works support a relation in the local universe steeper than previously thought. Based on comparisons with a variety of data on massive central galaxies, we show that this steepening holds up to z ∼ 1 for stellar masses Mstar ≳ 2 × 1011 M. Specifically, we find significant evidence for a high-mass end slope of β ≳ 0.35-0.70 instead of the usual β ≲ 0.20-0.30 reported by a number of previous results. When including the independent constraints from the recent Baryon Oscillation Spectroscopic Survey clustering measurements, the data, independent of any systematic errors in stellar masses, tend to favor a model with a very small scatter (≲ 0.15 dex) in stellar mass at fixed halo mass, in the redshift range z < 0.8 and for MSTAR > 3 × 1011 M, suggesting a close connection between massive galaxies and host halos even at relatively recent epochs. We discuss the implications of our results with respect to the evolution of the most massive galaxies since z ∼ 1.

Original languageEnglish (US)
Article numberL27
JournalAstrophysical Journal Letters
Volume797
Issue number2
DOIs
StatePublished - Dec 20 2014
Externally publishedYes

Keywords

  • cosmology: theory
  • galaxies: evolution
  • galaxies: statistics

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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