Deep NIC2 images of 20 high-z damped Ly-alpha galaxies

Details Deep NIC2 images of 20 high-z damped Ly-alpha galaxies Deep NIC2 images of 20 high-z damped Ly-alpha galaxies

Dec 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7824w&link_type=abstract

HST Proposal ID #7824

Computer Science

Hst Proposal Id #7824 Clusters Of Galaxies And Cosmology

Scientific paper

Using NIC2 we will obtain deep images of 20 high-z damped Ly- alpha galaxies at 1.86, as close as 0.4" { 1.5 h^-1 kpc} to the quasar line of sight. The damped Ly-alpha {DLA} galaxies contain nearly all the neutral gas in the Universe, so at high redshift they are the reservoirs from which today's stars formed. However the quasar absorption-line studies do not provide their sizes or morphologies, so they could be large e.g. the disks of today's spiral galaxies already formed, 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 m_V 26, m_H 23, and lie typically within 1" of the quasar. Our current program of STIS imaging will measure impact parameters, UV continuum sizes, and star-formation rates of a sample of high-z DLA galaxies. With NICMOS we will extend this study to the near-IR with deep H-band images of 20 DLA galaxies. These observations will provide the crucial rest- frame UV-optical colors and optical sizes and morphologies, vital for quantifying the effects of dust, and measuring ages and stellar masses. 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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