NOAO >   Observing Info >   Approved Programs >   2014A-0247

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Proposal Information for 2014A-0247


PI: Brian Keeney, University of Colorado Boulder, brian.keeney@colorado.edu
Address: Center for Astrophysics and Space Astronomy, 389 UCB, Boulder, CO 80309, USA

CoI: John Stocke, University of Colorado Boulder
CoI: Blair Savage, University of Wisconsin Madison
CoI: James Green, University of Colorado Boulder

Title: Gas and Galaxies in the Cosmic Web: A Galaxy Redshift Survey around \sl HST/COS Sight Lines

Abstract: The unprecedented far-UV throughput of the Cosmic Origins Spectrograph (COS; 20-30 times that of STIS at \mathcal R ~ 20,000) is revolutionizing studies of the local intergalactic medium (IGM). In particular, COS is allowing us to refine estimates of the baryon content and metallicity of the IGM, as well as the relationship of IGM absorbers to galaxies. Accordingly, the COS Science Team allocated ~ 200 \sl HST orbits of GTO time to map the baryon content of the local ``Cosmic Web'' in gas and galaxies. For the past five years, we have been obtaining HYDRA spectra of all galaxies brighter than g=20 with z_\rm photo < z_\rm AGN that are within 20\arcmin of the 39 AGN targeted by the COS Science Team. Our previous WIYN/HYDRA observations successfully obtain accurate redshifts for > 90% of g<=20 galaxies targeted, allowing an accurate galaxy census to L>=0.1 L^* for z\lesssim0.1. This semester, we propose to complete this spectroscopic campaign.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2014A-0247

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