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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Gems: The surface brightness and surface mass density evolution of disk galaxies
Astrophysical Journal, Volume 635, No. 2 I, Year 2005
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Description
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 MV ≲ -20, or equivalently, log(M/M⊙) ≳ 10. We find strong evolution in the magnitude-size scaling relation for galaxies with MV≲-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(M/M ⊙) ≳ 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. © 2005, The American Astronomical Society. All rights reserved.
Authors & Co-Authors
Rix, Hans Walter R.
Germany, Heidelberg
Max Planck Institute for Astronomy
Somerville, Rachel S.
United States, Baltimore
Space Telescope Science Institute
Bell, Eric F.
Germany, Heidelberg
Max Planck Institute for Astronomy
Häussler, Boris
Germany, Heidelberg
Max Planck Institute for Astronomy
Peng, Chien Y.
United States, Baltimore
Space Telescope Science Institute
United States, Tucson
The University of Arizona
Caldwell, John A.R.
United States, Baltimore
Space Telescope Science Institute
United States, Austin
University of Texas System
Heymans, Catherine E.
Germany, Heidelberg
Max Planck Institute for Astronomy
Jahnke, Knud
Germany, Potsdam
Leibniz Institute for Astrophysics Potsdam
Jogee, Shardha
United States, Baltimore
Space Telescope Science Institute
United States, Austin
The University of Texas at Austin
McIntosh, Daniel H.
United States, Amherst
University of Massachusetts Amherst
Meisenheimer, Klauss
Germany, Heidelberg
Max Planck Institute for Astronomy
Sánchez, Sebastián F.
Germany, Potsdam
Leibniz Institute for Astrophysics Potsdam
Spain, Almeria
Centro Astronómico Hispano-alemán
Wisotzki, Lutz
Germany, Potsdam
Leibniz Institute for Astrophysics Potsdam
Germany, Potsdam
Universität Potsdam
Statistics
Citations: 200
Authors: 13
Affiliations: 11
Identifiers
Doi:
10.1086/497679
ISSN:
15384357
Study Design
Cross Sectional Study
Study Approach
Quantitative