NOAO >   Observing Info >   Approved Programs >   2012A-0311

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Proposal Information for 2012A-0311


PI: Brian A. Keeney, University of Colorado, brian.keeney@colorado.edu
Address: Center for Astrophysics and Space Astronomy, 389 UCB, Boulder, CO 80309-0389, USA

CoI: John T. Stocke, University of Colorado
CoI: David Syphers, University of Colorado
CoI: Charles W. Danforth, University of Colorado
CoI: Bart P. Wakker, University of Wisconsin
CoI: Blair D. Savage, University of Wisconsin
CoI: Simon L. Morris, University of Durham, UK
CoI: Nicolas Tejos, University of Durham, UK

Title: Gas and Galaxies in the Cosmic Web: II. Associations of Galaxies with O VI Absorbers

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. Here we propose deep Gemini-N/GMOS spectroscopy of galaxies near QSOs targeted for \hst/COS UV spectroscopy to connect \OVI absorbers, which enter the \hst/COS bandpass at z\gtrsim0.1, to galaxies and galaxy groups. When combined with the \hst/COS far-UV spectra, these galaxy spectra will enhance our understanding of the composition and topology of the Universe in both gas and galaxies, allowing us to refine the local baryon census, investigate galaxy/absorber relationships (in some cases determining explicitly whether gas is infalling or outflowing from galaxies), assess the extent of metal transport away from galaxies, and constrain the metallicity of gas in galaxy voids.


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