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Title

Disk evolution since z-1 in a CDM universe

Author(s)

Brook, Chris B.;  Kawata, Daisuke;  Martel, Hugo;  Gibson, Brad K.;  Bailin, Jeremy

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.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing

Source

Astrophysical Journal, Vol. 639, no. 1 (2006), p. 126-135

Publication year

2006

Keyword(s)

Galaxy evolution;  Galaxy formation;  Galaxy structure;  Numerical methods

Publisher

University of Chicago Press

ISSN

0004-637X

Publisher URL

http://dx.doi.org/10.1086/499154

Copyright

Copyright © 2006 The American Astronomical Society. Reproduced in accordance with the copyright policy of the publisher.

Full text

Peer reviewed