GAMA/G10-COSMOS/3D-HST : evolution of the galaxy stellar mass function over 12.5 Gyr
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.
Citation
Wright , A H , Driver , S P & Robotham , A S G 2018 , ' GAMA/G10-COSMOS/3D-HST : evolution of the galaxy stellar mass function over 12.5 Gyr ' , Monthly Notices of the Royal Astronomical Society , vol. 480 , no. 3 , pp. 3491-3502 . https://doi.org/10.1093/MNRAS/STY2136
Publication
Monthly Notices of the Royal Astronomical Society
Status
Peer reviewed
ISSN
0035-8711Type
Journal article
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