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28 March 2024
 
  » arxiv » 1507.5636

 Article overview


The Evolution of the Galaxy Stellar Mass Function at z= 4-8: A Steepening Low-mass-end Slope with Increasing Redshift
Mimi Song ; Steven L. Finkelstein ; Matthew L. N. Ashby ; A. Grazian ; Yu Lu ; Casey Papovich ; Brett Salmon ; Rachel S. Somerville ; Mark Dickinson ; K. Duncan ; Sandy M. Faber ; Giovanni G. Fazio ; Henry C. Ferguson ; Adriano Fontana ; Yicheng Guo ; Nimish Hathi ; Seong-Kook Lee ; Emiliano Merlin ; S. P. Willner ;
Date 20 Jul 2015
AbstractWe present galaxy stellar mass functions (GSMFs) at $z=$ 4-8 from a rest-frame ultraviolet (UV) selected sample of $sim$4,500 galaxies, found via photometric redshifts over an area of $sim$280 arcmin$^2$ in the CANDELS/GOODS fields and the Hubble Ultra Deep Field. The deepest Spitzer/IRAC data yet-to-date from the Spitzer-CANDELS (26.5 mag, 3$sigma$) and the IRAC Ultra Deep Field 2010 (26.4-27.1 mag, 3$sigma$) surveys allow us to place robust constraints on the low-mass-end slope of the GSMFs, while the relatively large volume provides a better constraint at higher masses compared to previous space-based studies. Supplemented by a stacking analysis, we find a linear correlation between the rest-frame UV absolute magnitude at 1500AA ($M_{ m UV}$) and logarithmic stellar mass ($log M_*$). We use simulations to validate our method of measuring the slope of the $log M_*$-$M_{ m UV}$ relation, finding that the bias is minimized with a hybrid technique combining photometry of individual bright galaxies with stacked photometry for faint galaxies. The resultant measured slopes do not significantly evolve over $z=$ 4-8, while the normalization of the trend exhibits a weak evolution towards lower masses at higher redshift for galaxies at fixed $M_{ m UV}$. We combine the $log M_*$-$M_{ m UV}$ distribution with observed rest-frame UV luminosity functions at each redshift to derive the GSMFs. While we see no evidence of an evolution in the characteristic mass $M^*$, we find that the low-mass-end slope becomes steeper with increasing redshift from $alpha=-1.53^{+0.07}_{-0.06}$ at $z=4$ to $alpha=-2.45^{+0.34}_{-0.29}$ at $z=8$. The inferred stellar mass density, when integrated over $M_*=10^8$-$10^{13} M_{odot}$, increases by a factor of $13^{+35}_{-9}$ between $z=7$ and $z=4$ and is in good agreement with the time integral of the cosmic star-formation rate density.
Source arXiv, 1507.5636
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