Scaling Relations of Disk Galaxies in the Sloan Digital Sky Survey (Melanie Hall, Queen's University Astronomy Research Group)

Fundamental scaling relations for spiral galaxies are known to emerge when the observed galaxy radial velocity (V), total luminosity (L) and size (R) are combined.  I will present the compilation of a large sample of spiral galaxies with multi-band imaging from the SDSS and published galaxy rotational velocities V derived from HI line widths.  Through the comparison of SDSS and our own photometry, we establish the reliability of SDSS data products.  We also use our best galaxy parameters to derive tight VRL scaling relations including the largest correlation of galaxy velocity with baryonic mass (stars + gas), Mbar.  We find that the V-Mbar relation is not tighter, and thus no more fundamental, than the VL (so-called Tully-Fisher) relation of spiral galaxies.