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The SFR-M* Relation and Empirical Star-Formation Histories from ZFOURGE at 0.5 < z < 4 | | Adam R. Tomczak
; Ryan F. Quadri
; Kim-Vy H. Tran
; Ivo Labbe
; Caroline M. S. Straatman
; Casey Papovich
; Karl Glazebrook
; Rebecca Allen
; Gabreil B. Brammer
; Michael Cowley
; Mark Dickinson
; David Elbaz
; Hanae Inami
; Glenn G. Kacprzak
; Glenn E. Morrison
; Themiya Nanayakkara
; S. Eric Persson
; Glen A. Rees
; Brett Salmon
; Corentin Schreiber
; Lee R. Spitler
; Katherine E. Whitaker
; | | Date: |
20 Oct 2015 | | Abstract: | We explore star-formation histories (SFHs) of galaxies based on the evolution
of the star-formation rate stellar mass relation (SFR-M*). Using data from the
FourStar Galaxy Evolution Survey (ZFOURGE) in combination with far-IR imaging
from the Spitzer and Herschel observatories we measure the SFR-M* relation at
0.5 < z < 4. Similar to recent works we find that the average infrared SEDs of
galaxies are roughly consistent with a single infrared template across a broad
range of redshifts and stellar masses, with evidence for only weak deviations.
We find that the SFR-M* relation is not consistent with a single power-law of
the form SFR ~ M*^a at any redshift; it has a power-law slope of a~1 at low
masses, and becomes shallower above a turnover mass (M_0) that ranges from
10^9.5 - 10^10.8 Msol, with evidence that M_0 increases with redshift. We
compare our measurements to results from state-of-the-art cosmological
simulations, and find general agreement in the slope of the SFR-M* relation
albeit with systematic offsets. We use the evolving SFR-M* sequence to generate
SFHs, finding that typical SFRs of individual galaxies rise at early times and
decline after reaching a peak. This peak occurs earlier for more massive
galaxies. We integrate these SFHs to generate mass-growth histories and compare
to the implied mass-growth from the evolution of the stellar mass function. We
find that these two estimates are in broad qualitative agreement, but that
there is room for improvement at a more detailed level. At early times the SFHs
suggest mass-growth rates that are as much as 10x higher than inferred from the
stellar mass function. However, at later times the SFHs under-predict the
inferred evolution, as is expected in the case of additional growth due to
mergers. | | Source: | arXiv, 1510.6072 | | Services: | Forum | Review | PDF | Favorites | |
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