The Size Function of Galaxy Disks in the Sloan Digital Sky Survey

Details The Size Function of Galaxy Disks in the Sloan Digital Sky Survey The Size Function of Galaxy Disks in the Sloan Digital Sky Survey

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..396..413s&link_type=abstract

Formation and Evolution of Galaxy Disks ASP Conference Series, Vol. 396, Proceedings of the conference held 1-5 October, 2007 at

Astronomy and Astrophysics

Astronomy

Scientific paper

We perform two-dimensional, PSF-convolved bulge-disk decompositions in g, r, and i of a sample of 493,366 galaxies from the Sloan Digital Sky Survey Data Release Six. We compute the disk size function as a function of disk luminosity and characterize it through Gauss-Hermite expansions. The width of the size function increases by 50% towards fainter disk magnitudes, but it is still a factor of 1.4-2 narrower than theoretically predicted. The size function also exhibits highly significant deviations from log normality. In particular, 3.7% of the disks occupy a tail at large scale lengths, and these large disks are predominantly found in bulge-dominated galaxies. Their large sizes may come from angular momentum transfer in major merger events that form early-type galaxies.

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