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Title:
Disk Evolution since z~1 in a CDM Universe
Authors:
Brook, Chris B.; Kawata, Daisuke; Martel, Hugo; Gibson, Brad K.; Bailin, Jeremy
Affiliation:
AA(Département de physique, de génie physique et d'optique, Université Laval, Québec, QC G1K 7P4, Canada.), AB(Observatories of the Carnegie Institute of Washington, 813 Santa Barbara Street, Pasadena, CA 91101.; Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK.), AC(Département de physique, de génie physique et d'optique, Université Laval, Québec, QC G1K 7P4, Canada.), AD(Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK.; Laboratoire d'Astrophysique, Ecole Polytechnique Federale de Lausanne (EPFL), Observatoire, CH-1290 Sauverny, Switzerland.; Centre for Astrophysics and Supercomputing, Swinburne University, Hawthorn, Victoria 3122, Australia.), AE(Centre for Astrophysics, University of Central Lancashire, Preston PR1 2HE, UK.)
Publication:
The Astrophysical Journal, Volume 639, Issue 1, pp. 126-135. (ApJ Homepage)
Publication Date:
03/2006
Origin:
UCP
ApJ Keywords:
Galaxies: Evolution, Galaxies: Formation, Galaxies: Structure, Methods: Numerical
DOI:
10.1086/499154
Bibliographic Code:
2006ApJ...639..126B

Abstract

Increasingly large populations of disk galaxies are now being observed at increasingly high redshifts, providing new constraints on our knowledge of how such galaxies evolve. Are these observations consistent with a cosmology in which structures form hierarchically? To probe this question, we employ SPH/N-body galaxy-scale simulations of late-type galaxies. We examine the evolution of these simulated disk galaxies from redshift 1 to 0, looking at the mass-size and luminosity-size relations, and the thickness parameter, defined as the ratio of scale height to scale length. The structural parameters of our simulated disks settle down quickly, and after redshift z=1 the galaxies evolve to become only slightly flatter. Our simulated present-day galaxies are larger, more massive, less bright, and redder than at z=1. The inside-out nature of the growth of our simulated galaxies reduces, and perhaps eliminates, expectations of evolution in the size-mass relation.
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