PI: Brian A. Keeney, University of Colorado, email@example.com
Address: Center for Astrophysics and Space Astronomy, 389 UCB, Boulder, CO 80309-0389, USA
CoI: John T. Stocke, University of Colorado
CoI: Jessica Rosenberg, University of Colorado
Title: Broad-band and H(alpha) Imaging of Galaxies with QSO Sightline Halo Probes
Abstract: We propose to obtain two-color (B,R) broad-band and narrow-band H(alpha) images of a sample of ~ 40 galaxies selected by having nearby (5-150h^-1_70 kpc impact parameter) bright QSO probes (\rm B <=17.0). These QSO targets will provide the sample for a systematic absorption line study of gaseous galaxy halos to be conducted with the Cosmic Origins Spectrograph (COS) to be installed on HST in Spring 2005. Before COS, spectrographs have had too low throughput in the far-UV to permit such a study, so this sample will provide the first look at the following questions as a function of galaxy luminosity, type, HI mass and current SFR: (1) What are the physical extents, covering factors and metallicities of galaxy halos? (2) How far away from galaxies are metals spread? (3) What are the kinematics of very extended galaxy halos? The 2.1m imaging will be complemented by long- slit spectra from the ARC 3.5m, VLA D array HI maps and the HST/COS \rm R=30000 far ! UV spectra. We were awarded six nights at the 2.1m for this program last spring. On our one clear night we observed seven galaxies and discovered a massive starburst in a dwarf irregular galaxy 33h_70^-1 kpc from a \rm B=16.5 QSO sightline.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360