GAMA/G10-COSMOS/3D-HST: evolution of the galaxy stellar mass function over 12.5 Gyr

A. H. Wright*, S. P. Driver, A. S. G. Robotham

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

Using a combined and consistently analysed GAMA, G10-COSMOS, and 3D-HST data set, we explore the evolution of the galaxy stellar mass function over lookback times tL ∈ [0.2, 12.5] h70-1 Gyr. We use a series of volume-limited samples to fit Schechter functions in bins of ~constant lookback time and explore the evolution of the best-fitting parameters in both single and two-component cases. In all cases, we employ a fitting procedure that is robust to the effects of Eddington bias and sample variance. Surprisingly, when fitting a two-component Schechter function, we find essentially no evidence of temporal evolution in M*, the two α slope parameters, or the normalization of the low-mass component. Instead, our fits suggest that the various shape parameters have been exceptionally stable over cosmic time, as has the normalization of the low-mass component, and that the evolution of the stellar mass function is well described by a simple build-up of the high-mass component over time. When fitting a single component Schechter function, there is an observed evolution in both M* and α however, this is interpreted as being an artefact. Finally, we find that the evolution of the stellar mass function, and the observed stellar mass density, can be well described by a simple model of constant growth in the high-mass source density over the last 11 h70-1 Gyr.

Original languageEnglish
Pages (from-to)3491-3502
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume480
Issue number3
Early online date6 Aug 2018
DOIs
Publication statusPublished - 1 Nov 2018

Keywords

  • Galaxies: evolution
  • Galaxies: luminosity function
  • Galaxies: stellar content
  • Mass function

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