| Abstract: |
I will present new scaling relations of disk galaxies based on a well-defined sample selected from SDSS at z~0.1. By combining (i) the relation between stellar mass and "optical" rotation velocity, which is measured at the luminous part of the disk (i.e., the Tully-Fisher relation) and (ii) the relation between stellar mass and dark matter halo mass, derived from weak lensing, one can constrain the total (luminous and dark matter) mass profile of disk galaxies over two orders of magnitude (<10 kpc to 100 kpc). Results serve as constraints on disk galaxy formation models, and in particular, the extent of halo contraction due to baryon infall-- an open issue on both theoretical and observational fronts. |
