Physics – Optics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003phdt........10g&link_type=abstract
Thesis (PhD). UNIVERSITY OF CALIFORNIA, LOS ANGELES, Source DAI-B 64/06, p. 2714, Dec 2003, 162 pages.
Physics
Optics
Scientific paper
This thesis presents a sample of resolved, infrared (IR) images of galaxies at z ˜ 0.6 taken with the 10 m Keck Telescope's adaptive optics (AO) system. We regularly achieve a spatial resolution of 0.0'' 5 and are thus able to resolve both the disk and bulge components. We have extracted morphological information for ten galaxies and compared their properties to those of a local sample. The selection effects of both samples were explicitly taken into account in order to derive the unbiased result that disks at z ˜ 0.6 are ˜0.6 mag arcsec-2 brighter than, and about the same size as, local disks. The case with no luminosity evolution is ruled out at 90% confidence. We also find, in a more qualitative analysis, that the bulges of these galaxies have undergone a smaller amount of surface brightness evolution and also have not changed significantly in size from z ˜ 0.6 to today. This is the first time this type of morphological evolution has been measured in the IR and it points to the unique power of AO in exploring galaxy evolution.
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