Computer Science
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12198r&link_type=abstract
HST Proposal ID #12198. Cycle 18
Computer Science
Scientific paper
We propose an absorption-line study of 3 QSO sight lines behind the Leo Ring with COS. The Leo Ring is a huge { 200 kpc in diameter, HI mass of 2x10^9 solar masses} neutral gas cloud that has been postulated to be either tidal or primordial in origin. Despite over 25 years of investigation, the mystery of its origin remains unsolved. By obtaining the most robust measurement of metallicity to date and constraining the ionized gas content along these sight lines, we will finally be able to determine the origin of the gas. The observations include Ly-alpha plus low and high ionization metal lines in absorption that will be modeled with the photoionization code, CLOUDY. If the gas in this feature is primordial {low metallicity and highly ionized}, it provides an interesting challenge for those who model the formation and evolution of galaxies and reveals a unique mode of galaxy formation. Alternatively if the feature is tidal in origin, these observations represent one of the first absorption line studies of tidal gas which has been argued to be a significant component of the enrichment of the intergalactic medium.;
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