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.
http://arxiv.org/abs/1311.7207

For a PDF version of the article, click here.

SCALING LAWS IN DISK GALAXIES

Alister W. Graham


Centre for Astrophysics and Supercomputing, Swinburne University of Technology, Hawthorn, Victoria 3122, Australia.


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

LIGHT PROFILES - THE RADIAL CONCENTRATION OF STARS

A FEW SELECT DISK GALAXY SCALING RELATIONS
Insight from elliptical galaxies
Bulges

BULGE-TO-DISK FLUX RATIOS AND THE HUBBLE SEQUENCE
Bulgeless galaxies

(BLACK HOLE)-BULGE SCALING RELATIONS

PSEUDOBULGES
Rotation
Ages

COMPACT MASSIVE BULGES

REFERENCES

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