To appear in the ASP Conf. Ser. "Structure and Dynamics
of Disk Galaxies" - Petit Jean Mountain, Arkansas, USA (12-16 August
2013), M.Seigar and P.Treuthardt, eds
Published in Bulletin of the Astronomical Society of
India, Vol. 41, No. 1, p. 61-115, 2013.
For a PDF version of the article, click here.
http://arxiv.org/abs/1311.7207
Abstract: A brief overview of several recent disk galaxy scaling relations is presented, along with some historical background. In particular, after introducing the (basic) radial light profiles of disk galaxies, I explain several important `structural' scaling relations and review the latest bulge-(black hole mass) diagrams. I go on to present the typical bulge-to-disk flux ratios of disk galaxies and suggest the use of a grid of bulge-to-disk ratio versus disk Hubble type — based on the nature of the spiral arms — to complement the Hubble-Jeans sequence. I then briefly mention pure disk galaxies before cautioning on difficulties with identifying pseudobulges built from secular evolution. Finally, I conclude by discussing a likely connection between modern day bulges in disk galaxies and high-redshift (z ~ 2 ± 0.5) compact galaxies which may have since acquired a disk via cold flows and quiescent accretion.
Table of Contents