PROPERTIES OF DISKS AND BULGES OF SPIRAL AND LENTICULAR GALAXIES IN THE SLOAN DIGITAL SKY SURVEY
- Department of Astronomy, University of Tokyo, Hongo, Tokyo 113-0033 (Japan)
- Department of Astronomy and Research Center for the Early Universe, University of Tokyo, Hongo, Tokyo 113-0033 (Japan)
- Institute for Advanced Study, Princeton, NJ 08540 (United States)
- Institute for Cosmic Ray Research, University of Tokyo, Kashiwa 277-8582 (Japan)
- Graduate School of Political Science, Waseda University, Shinjuku, Tokyo 169-8050 (Japan)
A bulge-disk decomposition is made for 737 spiral and lenticular galaxies drawn from a Sloan Digital Sky Survey galaxy sample for which morphological types are estimated. We carry out the bulge-disk decomposition using the growth curve fitting method. It is found that bulge properties, effective radius, effective surface brightness, and also absolute magnitude, change systematically with the morphological sequence; from early to late types, the size becomes somewhat larger, and surface brightness and luminosity fainter. In contrast, disks are nearly universal, their properties remaining similar among disk galaxies irrespective of detailed morphologies from S0 to Sc. While these tendencies were often discussed in previous studies, the present study confirms them based on a large homogeneous magnitude-limited field galaxy sample with morphological types estimated. The systematic change of bulge-to-total luminosity ratio, B/T, along the morphological sequence is therefore not caused by disks but mostly by bulges. It is also shown that elliptical galaxies and bulges of spiral galaxies are unlikely to be in a single sequence. We infer the stellar mass density (in units of the critical mass density) to be OMEGA = 0.0021 for spheroids, i.e., elliptical galaxies plus bulges of spiral galaxies, and OMEGA = 0.00081 for disks.
- OSTI ID:
- 21378395
- Journal Information:
- Astrophysical Journal, Vol. 705, Issue 1; Other Information: DOI: 10.1088/0004-637X/705/1/245; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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