Revealing of convex disk profiles in LSB galaxies
Abstract
The radial brightness profiles of 38 disk-dominated low surface brightness (LSB) galaxies, 12 taken from Romanishin et al. and 26 taken from Sloan Digital Sky Survey, were investigated. The profiles were decomposed into bulge and disk components using Kormendy's method. In our approach both the bulge and the disk profiles were fitted through Sersic's formula. Thus the convexity of the disk profile is expressed in terms of the exponential power number in the formula, without introducing the concept of a cut-off radius of the disk. We found that the convexity of the RSS83 disk profiles correlates with the luminosity of the bulge. Such a correlation was not found for the SDSS profiles, probably due to the low resolution of the profiles. We found also for both samples that the convexity of the disk profiles correlates with the ratio of the scale lengths of the disk and the bulge. We interpreted these correlations as indirect evidences, as in the case of normal galaxies, that more massive LSB galaxies have more convex disk profiles.
- Publication:
-
Bulgarian Astronomical Journal
- Pub Date:
- 2006
- Bibcode:
- 2006BlgAJ...8..143D
- Keywords:
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- galactic disks;
- galaxies;
- structure;
- galaxies;
- fundamental parameters