The massive end of the luminosity and stellar mass functions and clustering from CMASS to SDSS: evidence for and against passive evolution

M. Bernardi, A. Meert, R. K. Sheth, M. Huertas-Company, C. Maraston, F. Shankar, V. Vikram

Research output: Contribution to journalArticlepeer-review

77 Downloads (Pure)

Abstract

We describe the luminosity function, based on Sersic fits to the light profiles, of CMASS galaxies at z ~ 0.55. Compared to previous estimates, our Sersic-based reductions imply more luminous, massive galaxies, consistent with the effects of Sersic- rather than Petrosian or de Vaucouleur-based photometry on the Sloan Digital Sky Survey (SDSS) main galaxy sample at z ~ 0.1. This implies a significant revision of the high mass end of the correlation between stellar and halo mass. Inferences about the evolution of the luminosity and stellar mass functions depend strongly on the assumed, and uncertain, k+e corrections. In turn, these depend on the assumed age of the population. Applying k+e corrections taken from fitting the models of Maraston et al. (2009) to the colors of both SDSS and CMASS galaxies, the evolution of the luminosity and stellar mass functions appears impressively passive, provided that the fits are required to return old ages. However, when matched in comoving number- or luminosity-density, the SDSS galaxies are less strongly clustered compared to their counterparts in CMASS. This rules out the passive evolution scenario, and, indeed, any minor merger scenarios which preserve the rank ordering in stellar mass of the population. Potential incompletenesses in the CMASS sample would further enhance this mismatch. Our analysis highlights the virtue of combining clustering measurements with number counts.
Original languageEnglish
Pages (from-to)4122-4135
Number of pages14
JournalMonthly Notices of the Royal Astronomical Society
Volume455
Issue number4
Early online date4 Dec 2015
DOIs
Publication statusPublished - 1 Feb 2016

Keywords

  • astro-ph.GA
  • astro-ph.CO
  • galaxies: abundances
  • galaxies: evolution
  • galaxies; luminosity function
  • mass function
  • galaxies: photometry
  • large-scale structure of Universe
  • RCUK
  • STFC

Fingerprint

Dive into the research topics of 'The massive end of the luminosity and stellar mass functions and clustering from CMASS to SDSS: evidence for and against passive evolution'. Together they form a unique fingerprint.

Cite this