NOAO >   Observing Info >   Approved Programs >   2005A-0544

Small NOAO Logo

Proposal Information for 2005A-0544


PI: Daniel Nestor, University of Florida, dbn@phyast.pitt.edu
Address: Astronomy Department, 211 Bryant Space Science Center, Gainesville, FL 32611-2055, USA

CoI: Sandhya Rao, University of Pittsburgh
CoI: Dave Turnshek, University of Pittsburgh
CoI: Fred Hamann, University of Florida

Title: Imaging Ultra-Strong Low Redshift \ionMg2 Absorbers

Abstract: Quasar absorption lines provide a mechanism to study structures in the Universe selected via gas cross section at cosmologically- significant distances. Importantly, there is no luminosity bias in this type of selection. The Sloan Digital Sky Survey has allowed for the discovery of a very large number of \ionMg2 absorption systems, including an unprecedented number of the strongest systems. We have catalogued a new regime of ``ultra-strong'' \ionMg2 absorbers, which correspond to enormous kinematic spreads and large \ionH1 column densities. Because of the previous lack of any known ultra-strong systems, their nature has not yet been explored. Thus, we propose to use WIYN to image ~ 8-10 quasar fields containing ultra-strong \ionMg2 absorbers. Two hour exposures in r^\prime will allow us to detect L\lesssim0.1L^* at z~0.5 and tip-tilt will allow small impact parameters to be accessed in order to identify any absorbing galaxy(s) and uncover the nature of these rare systems.


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 >   2005A-0544

noaoprop-help@noao.edu

Small NOAO Logo