Year: 2005
Type: article
Abstract: We combine HST imaging from the GEMS (Galaxy Evolution from Morphologies and SEDs) survey with photometric redshifts from COMBO-17 to explore the evolution of disk-dominated galaxies since z ≲ 1.1. The sample is composed of all GEMS galaxies with Sérsic indices n < 2.5, derived from fits to the galaxy images. We account fully for selection effects through careful analysis of image simulations; we are limited by the depth of the redshift and HST data to the study of galaxies with M V ≲ -20, or equivalently, log ≳ 10. We find strong evolution in the magnitude-size scaling relation for galaxies with M V ≲ -20, corresponding to a brightening of ~1 mag arcsec -2 in rest-frame V band by z ~ 1. Yet disks at a given absolute magnitude are bluer and have lower stellar mass-to-light ratios at z ~ 1 than at the present day. As a result, our findings indicate weak or no evolution in the relation between stellar mass and effective disk size for galaxies with log ≳ 10 over the same time interval. This is strongly inconsistent with the most naive theoretical expectation, in which disk size scales in proportion to the halo virial radius, which would predict that disks are a factor of 2 denser at fixed mass at z ~ 1. The lack of evolution in the stellar mass-size relation is consistent with an "inside-out" growth of galaxy disks on average (galaxies increasing in size as they grow more massive), although we cannot rule out more complex evolutionary scenarios.
Source: The Astrophysical Journal
DOI: 10.1086/497679
Authors: Marco Barden, Hans‐Walter Rix, Rachel S. Somerville, Eric F. Bell, Boris Hausler, Chien Y. Peng, Andrea Borch, Steven V. W. Beckwith, John A. R. Caldwell, Catherine Heymans, Knud Jahnke, Shardha Jogee, Daniel H. McIntosh, Klaus Meisenheimer, Sebastian F. Sanchez, Lutz Wisotzki, Christian Wolf
Institutions: Max Planck Institute for Astronomy, Space Telescope Science Institute, University of Arizona, Johns Hopkins University, McDonald Observatory, Leibniz Institute for Astrophysics Potsdam, The University of Texas at Austin, University of Massachusetts Amherst, Calar Alto Observatory, University of Potsdam, University of Oxford
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funders: National Science Foundation, U.S. Department of Energy, National Aeronautics and Space Administration, Alfred P. Sloan Foundation, Princeton University, University of Washington, Johns Hopkins University, University of Pittsburgh, New Mexico State University, Space Telescope Science Institute, Max-Planck-Gesellschaft, Max-Planck-Institut für Astronomie, U.S. Naval Observatory, Fermilab, Los Alamos National Laboratory
OpenAlex ID: W2018828554