NOAO >   Observing Info >   Approved Programs >   2003B-0266

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Proposal Information for 2003B-0266


PI: John T. Stocke, University of Colorado, stocke@casa.colorado.edu
Address: Center for Astrophysics and Space Astronomy, UCB 389, Boulder, CO 80309, US

CoI: Jessica L. Rosenberg, University of Colorado
CoI: Brian A. Keeney, University of Colorado
CoI: Emma Ryan-Weber, University of Melbourne
CoI: Mary Putman, University of Colorado

Title: Broad-band and H(alpha) Imaging of Galaxies with QSO Sightline Probes Through Their Halos

Abstract: We propose to obtain two-color (B, R) broad-band and narrow-band H(alpha) images of a sample of 16 galaxies which have nearby (5 - 150h^-1_70 kpc impact parameter) bright QSO probes (V<=17.0). These data will be used to select the best 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 fall 2004. Before COS, HST spectrographs have had too low throughput in the far-UV to permit such a study, so the COS sample will provide the first look at the following questions as a function of galaxy luminosity, type, HI mass, and current star formation rate: \noindent (1) What are the physical extents, covering factors and metallicities of galaxy halos? \noindent (2) How far away from galaxies have metals spread? \noindent (3) What are the kinematics of very extended galaxy halos? The 0.9m imaging (and 2.1m imaging in the north) will be complemented by long-slit spectra, ATCA or VLA H I maps and, of course, the HST/COS R=22000 far-UV spectra. The southern fall sky includes our highest priority target (see Figure 1).


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