CfA OIR Division Lunch Talks
Thursday, May 8, 2008, 12:30 pm, Pratt Conference Room

Puzzles in Galaxy Scaling Relations

Dr. Stephane Courteau (Queen's University)

Spiral galaxies exhibit global correlations between their total luminosity, maximum circular velocity, and disk scale length that pose a fundamental challenge to standard models of structure formation. On local scales, galaxy scaling relations that include velocity dispersion estimates (such as the M_BH-sigma and the Vcirc-sigma relations) are also challenging to both structure formation and galaxy dynamics models. I will discuss recent derivations of global and local galaxy scaling relations and our attempts to understand them. These scaling relations can also be interpreted in terms of the relative distribution of baryonic and dark matter in spiral galaxies as I address in this presentation.