AAS 201st Meeting, January, 2003
Session 100. Galaxy Evolution and Surveys: Miscellaneous
Oral, Wednesday, January 8, 2003, 10:00-11:30am, 613-614

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[100.05] Comparing Baryonic and Halo Disk Galaxy Masses to z=1

C.J. Conselice, K. Bundy, R.S. Ellis (Caltech), N. Vogt (NMSU), J. Brinchmann (MPA), A. Benson (Caltech)

The detailed understanding of galaxy formation and evolution requires a knowledge of the mass components of galaxies, baryonic and dark, and how they evolve with time. To address this problem, we present initial results of a Keck/HST survey to evaluate virial and stellar masses for over 100 disk galaxies out to redshifts z ~1. Stellar masses have been derived using ground based K-band data in combination with HST optical images in various optical bands. We have developed tools for optimally fitting this photometry to stellar population synthesis models in order to determine the stellar mass of each galaxy. Virial masses are obtained through the use of scale length fits to surface brightness profiles and Vmax ratios obtained from long-slit Keck+LRIS data. We present the ratio of baryonic to total mass for our sample and discuss these results in the context of popular models for the evolution of disk galaxies.

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Bulletin of the American Astronomical Society, 34, #4
© 2002. The American Astronomical Soceity.