Mathematics – Logic
Scientific paper
Feb 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001noao.prop..323r&link_type=abstract
NOAO Proposal ID #2001A-0323
Mathematics
Logic
Scientific paper
We propose to assemble optical-IR photometric (UBRIJHK) data on galaxies in the fields of 32 QSOs whose absorption spectra indicate that the sight-lines toward them pass through 36 large columns of neutral hydrogen gas with N_HI> 10^19 atoms cm^-2. About 44% (16) of the absorption systems are classically termed damped Ly(alpha) (DLA) systems with N_HI≥2×10^20 atoms cm^-2, while the remainder are sub-DLA with 10^19< N_HI< 2×10^20 atoms cm^- 2. These systems all have z< 1. HST spectroscopy yields precise measures of their HI column densities. Our specific goal is to use multi-color images of these fields to derive photometric redshifts for all the galaxies down to the limit L< 0.05-0.1L^*. For each absorption system we will then determine which galaxy is the absorbing galaxy. Further measurements will determine the absorbing galaxies' impact parameters, luminosities, and, when possible, morphological types. We have already assembled a substantial part of this data set and, from our work over the last several years, know that almost all of the DLA galaxies are (unexpectedly) much fainter than L^*. Consequently, the most straightforward way to make substantial future progress is by employing the photometric redshift technique. This work has important significance since it will allow us to determine the nature of the galactic objects that contain the bulk of the neutral hydrogen gas mass in the Universe at z< 1.
Lane Wendy
Monier Eric
Nestor Daniel
Rao Sandhya
Turnshek David
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