The Nature of Ultra-strong MgII Absorber Galaxies

Details The Nature of Ultra-strong MgII Absorber Galaxies The Nature of Ultra-strong MgII Absorber Galaxies

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008noao.prop..159n&link_type=abstract

NOAO Proposal ID #2008A-0159

Physics

Scientific paper

We propose to obtain GMOS spectra of galaxies identified by Nestor et al. (2007, ApJ, 658, 185) in the fields of 10 quasars containing rare "ultra-strong" MgII absorbers which exhibit saturated low-ion absorption over lower-limit velocity spreads of > 300-650 km/s. Ultra-strong MgII absorbers may have important implications on our understanding of the evolution of global star formation, hierarchical galaxy formation, and the distribution of metals into the IGM. These observations will confirm the redshifts and therefore identities of the absorbing galaxies and determine or set limits on their star formation rates and metallicities, thereby providing the first unambiguous empirical clues to the origin of the extreme velocity spreads seen in absorption that define these systems. These data will also confirm or repudiate the possible discovery of 4L* < L < 13L* galaxies, associated with these absorbers, with luminosities and redshifts intermediate to local starburst galaxies and Lyman-break galaxies.

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