STIS Deep DLA Imaging Survey II

Details STIS Deep DLA Imaging Survey II STIS Deep DLA Imaging Survey II

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8172m&link_type=abstract

HST Proposal ID #8172

Computer Science

Hst Proposal Id #8172 Quasar Absorption Lines

Scientific paper

Using STIS we will obtain deep images of 20 high-z damped Ly- alpha galaxies at 1.86, as close as 0.4" { 1.4 h^-1 kpc} to the quasar line of sight. The damped Ly-alpha galaxies contain nearly all neutral gas in the Universe, so at high redshift they are the reservoirs from which today's stars formed. However quasar absorption- line studies do not provide sizes or morphologies, so they could be either large disks, or small e.g. more numerous proto-galactic subunits. Deep imaging can resolve this issue, and HST is required because the galaxies are very faint, and lie typically within 1" of the quasar. Our STIS survey is aimed at measuring impact parameters, UV continuum sizes, and star-formation rates of high-z DLA galaxies. With NICMOS we extended this study to the near-IR with deep H-band imaging of 20 DLA galaxies. These observations will provide the crucial rest-frame UV-optical colors and optical sizes and morphologies. This proposal is to now complete STIS imaging of the NICMOS sample. The HST imaging together with ground-based spectroscopy will unify absorption-line studies and faint galaxy imaging studies, providing a comprehensive picture of the history of assembly, star formation, gas consumption, and chemical enrichment in the DLA galaxies.

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