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2000ApJ...531..137K - Astrophys. J., 531, 137-158 (2000/March-1)
The evolution of early-type galaxies in distant clusters. I. Surface photometry and structural parameters for 53 galaxies in the z=0.33 cluster Cl 1358+62.
KELSON D.D., ILLINGWORTH G.D., VAN DOKKUM P.G. and FRANX M.
Abstract (from CDS):
We investigated the stability of re by comparing the r1/4-law fits to the half-light radii derived using other commonly used surface brightness profiles. In particular, we fit Sersic r1/n laws (finding the best-fit n in the range n=1-6) and superpositions of r1/4-law bulges with exponential disks. The half-light radii derived from the best-fit Sersic profiles varied with respect to re from the r1/4-law fits by only 1% in the median, but with a standard deviation of more than 40% in re. For the bulge+disk fits, the derived half-light radii were offset from re of the r1/4-law fits by 10% in the mean, also showing a large standard deviation of more than 40%. By comparing the fitted half-light radii from the Sersic laws with those derived from the bulge+disk fitting, one also finds a large scatter of 30%. Based on these tests, we conclude that, in general, half-light radii are only measured with a typical accuracy of 30%-40%.
While there are large uncertainties in half-light radii, these do not impact the subsequent fundamental plane analysis because the combination r<I>0.76, which enters the fundamental plane, is extremely stable. The rms scatter in r<I>0.76 is less than 3%, regardless of the form of the profile fit to the galaxies.
By fitting bulge+disk profiles, we find that the median bulge fraction of the sample is 84% and that the few E+A galaxies in this sample have disks which make up about 10%-35% of their total light. These results are consistent with the residuals from fitting two-dimensional r1/4-law models directly to the galaxies, in which disklike structures are revealed in about half of the sample. Two of the three E+A galaxies show spiral arm structure.
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Journal keyword(s): Galaxies: Clusters: Individual: Alphanumeric: Cl 1358+62 - Galaxies: Evolution
Simbad objects: 56
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