Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7333m&link_type=abstract
HST Proposal ID #7333
Computer Science
Hst Proposal Id #7333 Cosmology
Scientific paper
Using STIS, in 50CCD mode, we will obtain images of 48 damped LyAlpha galaxies. The low read-out noise, small pixel size, large well depth, and high throughput of this configuration allows us to detect any galaxy brighter than m_V=28 to within ~0.5" of the quasar. At present there is only one damped system successfully imaged with HST. The targets of our proposed DLA--survey cover a large range of redshift and column density, and the result will be an enormous increase in our understanding of the nature of the damped LyAlpha galaxies and their role in galaxy formation. We will measure impact parameters for all the detected galaxies, and light profiles of the detected continuum emission. These data will enable us to answer two crucial questions that are currently unanswered: beginenumerate em What are the sizes of the damped LyAlpha systems? em What is the connection between the damped LyAlpha systems and the Lyman--break galaxies? endenumerate Taken together this information will provide the whole of the galaxy luminosity function at high redshift, and may be compared against the increasingly sophisticated simulations of galaxy formation, and so test theories of hierarchical galaxy formation. This study will unify absorption-line studies, and faint galaxy imaging studies, thereby allowing a detailed treatment of the history of star formation, gas consumption, chemical enrichment, and assembly in the population of galaxies.
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