Galaxy Evolution in the last 9 Billion Years

Details Galaxy Evolution in the last 9 Billion Years Galaxy Evolution in the last 9 Billion Years

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007phdt.........1h&link_type=abstract

PhD Thesis, Combined Faculties for the Natural Sciences and for Mathematics of the Ruperto-Carola University of Heidelberg, Germ

Mathematics

1

Cosmology: Observations, Galaxies: Evolution, Galaxies: High-Redshift, Galaxies: Spiral, Galaxies, Spheroidal, Galaxies: Merging, Surveys

Scientific paper

I use HST imaging from the GEMS survey and photometric redshifts from COMBO-17 to explore the role of blue spheroidal galaxies (BSGs) and the evolution of disk-dominated galaxies since z~1. To be able to define the galaxy samples, I extensively tested GALFIT and GIM2D, two widely used 2-D fitting packages, on both simulated and real data. I find that GALFIT returns more reliable results than GIM2D; in particular due to its ability to simultaneously fit neighboring galaxies. Both codes significantly underestimate the uncertainty of the fit. I extract a sample of BSG galaxies through automated and visual classification of rest-frame images. I find that only high-mass-density BSGs can passively evolve into typical red-sequence galaxies. I find that the high-density BSGs include ~6% of the massive early type galaxy population, consistent with expectations from published massive galaxy merger rates. I find strong evolution of the galaxy magnitude-size scaling relation for disk-dominated galaxies with M_V <~ -20, corresponding to a brightening of ~1 mag arcsec^-2 in rest-frame V-band by z~1. Only weak or no evolution was found in the mass-size relation for galaxies with log(M/M_sun) >~ 10 in the same time, consistent with an inside-out' growth of galaxy disks on average. Galaxies increase in size as they grow more massive.

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