PI: Brian Keeney, University of Colorado, email@example.com
Address: Center for Astrophysics and Space Astronomy, 389 UCB, Boulder, CO 80309, USA
CoI: John Stocke, University of Colorado
CoI: Emma Ryan-Weber, Swinburne University of Technology
Title: Gas and Galaxies in the Cosmic Web: III. Imaging Galaxies Near \hst/COS AGN Fields with DECam
Abstract: The Cosmic Origins Spectrograph (COS) was installed aboard the \sl Hubble Space Telescope (\sl HST) in May 2009 and is now routinely returning UV spectra of unprecedented quality that enable detailed studies of the low-z intergalactic medium (IGM). The unique promise of this extensive set of UV spectra is to connect QSO absorbers with galaxies, allowing us to determine which absorbers are associated with galactic infall/outflow processes - a connection that can only be done with confidence at low redshift. For the past five years, we have obtained 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 GTO team. Now we are pursuing observations of an additional 30 COS GO sight lines, primarily in the northern hemisphere where SDSS images and photometric redshifts are available for target selection. In this proposal, we request one grey night to image the fields of 10-15 southern hemisphere sight lines with DECam. We will calculate photometric redshifts for all galaxies in these images to target those with z_\rm photo < z_\rm AGN for follow-up spectroscopy.
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