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3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since z = 3

van der Wel, A.; Franx, M.; van Dokkum, P. G.; Skelton, R. E.; Momcheva, I. G.; Whitaker, K. E.; Brammer, G. B.; Bell, E. F.; Rix, H. W.; Wuyts, S.; Ferguson, H. C.; Holden, B. P.; Barro, G.; Koekemoer, A. M.; Chang, Y. Y.; McGrath, E. J.; Häussler, B.; Dekel, A.; Behroozi, P.; Fumagalli, M.; Leja, J.; Lundgren, B. F.; Maseda, M. V.; Nelson, E. J.; Wake, D. A.; Patel, S. G.; Labbé, I.; Faber, S. M.; Grogin, N. A. and Kocevski, D. D. (2014). 3D-HST+CANDELS: The Evolution of the Galaxy Size-Mass Distribution since z = 3. Astrophysical Journal, 788(1), article no. 28.

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Spectroscopic+photometric redshifts, stellar mass estimates, and rest-frame colors from the 3D-HST survey are combined with structural parameter measurements from CANDELS imaging to determine the galaxy size-mass distribution over the redshift range 0 < z < 3. Separating early- and late-type galaxies on the basis of star-formation activity, we confirm that early-type galaxies are on average smaller than late-type galaxies at all redshifts, and we find a significantly different rate of average size evolution at fixed galaxy mass, with fast evolution for the early-type population, $R_{\rm {eff}}\propto (1 + z)^{-1.48}$, and moderate evolution for the late-type population, $R_{\rm {eff}}\propto (1 + z)^{-0.75}$. The large sample size and dynamic range in both galaxy mass and redshift, in combination with the high fidelity of our measurements due to the extensive use of spectroscopic data, not only fortify previous results but also enable us to probe beyond simple average galaxy size measurements. At all redshifts the slope of the size-mass relation is shallow, $R_{\rm {eff}}\propto M_*^{0.22}$, for late-type galaxies with stellar mass >3 × 10$^{9} M_\odot$, and steep, $R_{\rm {eff}}\propto M_*^{0.75}$, for early-type galaxies with stellar mass >2 × 10$^{10} M_\odot$. The intrinsic scatter is ≲ 0.2 dex for all galaxy types and redshifts. For late-type galaxies, the logarithmic size distribution is not symmetric but is skewed toward small sizes: at all redshifts and masses, a tail of small late-type galaxies exists that overlaps in size with the early-type galaxy population. The number density of massive (~10$^{11} M_\odot$), compact ($R_{\rm {eff}}$ < 2 kpc) early-type galaxies increases from z = 3 to z = 1.5-2 and then strongly decreases at later cosmic times.

Item Type: Journal Item
Copyright Holders: 2014 The American Astronomical Society
ISSN: 1538-4357
Extra Information: 19 pp.
Keywords: galactic evolution; galaxies; fundamental parameters; high-redshift galaxies; galactic structure
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 48546
Depositing User: Users 0 not found.
Date Deposited: 22 Feb 2017 09:13
Last Modified: 09 Dec 2018 07:06
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