The Size Evolution of Passive Galaxies: Observations from the Wide Field Camera 3 Early Release Science Program

Details The Size Evolution of Passive Galaxies: Observations from the Wide Field Camera 3 Early Release Science Program The Size Evolution of Passive Galaxies: Observations from the Wide Field Camera 3 Early Release Science Program

2010-07-08

arxiv.org/abs/1007.1460v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

11 pages, 7 figures, 4 tables. Submitted to ApJ

Scientific paper

We present results on the size evolution of passively evolving galaxies at 11.5. We identify 30 galaxies in ~40 square arcmin to H<25 mag. We supplement spectroscopic redshifts from the literature with photometric redshifts determined from the 15-band photometry from 0.22-8 micron. We determine effective radii from Sersic profile fits to the H-band image using an empirical PSF. We find that size evolution is a strong function of stellar mass, with the most massive (M* ~ 10^11 Msol) galaxies undergoing the most rapid evolution from z~2 to the present. Parameterizing the size evolution as (1+z)^{-alpha}, we find a tentative scaling between alpha and stellar mass of alpha ~ -1.8+1.4 log(M*/10^9 Msol). We briefly discuss the implications of this result for our understanding of the dynamical evolution of the red galaxies.

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