The Size Evolution of Passive Galaxies: Observations from the Wide Field Camera 3 Early Release Science Program - Astrophysics > Cosmology and Nongalactic AstrophysicsReport as inadecuate




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Abstract: We present results on the size evolution of passively evolving galaxies at11.5. Weidentify 30 galaxies in ~40 square arcmin to H<25 mag. We supplementspectroscopic redshifts from the literature with photometric redshiftsdetermined from the 15-band photometry from 0.22-8 micron. We determineeffective radii from Sersic profile fits to the H-band image using an empiricalPSF. We find that size evolution is a strong function of stellar mass, with themost massive M* ~ 10^11 Msol galaxies undergoing the most rapid evolutionfrom 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+1.4logM*-10^9 Msol. We briefly discuss the implications of this result for ourunderstanding of the dynamical evolution of the red galaxies.



Author: R. E. Ryan Jr., P. J. McCarthy, S. H. Cohen, H. Yan, N. P. Hathi, A. M. Koekemoer, M. J. Rutkowski, M. R. Mechtley, R. A. Windhor

Source: https://arxiv.org/







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