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Paper: The Size Function of Galaxy Disks in the Sloan Digital Sky Survey
Volume: 396, Formation and Evolution of Galaxy Disks
Page: 413
Authors: Simard, L.
Abstract: 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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