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作者 Grodnicki, Lauren R
書名 Luminous halos surrounding edge-on disk galaxies in the Sloan Digital Sky Survey
國際標準書號 9781124048680
book jacket
說明 82 p
附註 Source: Dissertation Abstracts International, Volume: 71-07, Section: B, page: 4297
Adviser: Richard Kron
Thesis (Ph.D.)--The University of Chicago, 2010
We present the first measurement of both major-axis and minor-axis average surface brightness profiles of low-redshift (0.009 ≤ z ≤ 0.1), edge-on Sc-Sd galaxies. The 906 objects in our sample have 90% Petrosian radii between 5 kpc and 15 kpc and were selected from the Fourth Data Release of the Sloan Digital Sky Survey. The minor-axis profile extends to 20 kpc above the disk and a limiting surface brightness of 30 mag/arcsec2 . We demonstrate that this surface brightness profile is best fit by an exponential+power-law with slope 2.3 +/- 0.3 in agreement with simulations and star counts around individual galaxies. We attribute the power-law component to a diffuse stellar halo and present the first measurement of such around isolated, late-type galaxies. We also divide our sample according to physical size and show that the minor-axis power-law slopes of the two size categories do not differ by more than 2sigma, also in agreement with simulations. We find that the average major-axis scale length is reap = 4.37 +/- 0.012 kpc, somewhat larger than the typical value for face-on galaxies (see, for example, Kent (1985)). We also present the first measurement of the ratio of the disk luminosity to that of the halo, and provide a context for this ratio
School code: 0330
Host Item Dissertation Abstracts International 71-07B
主題 Physics, Astrophysics
Alt Author The University of Chicago. Astronomy and Astrophysics
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