Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.8086b&link_type=abstract
HST Proposal ID #8086
Physics
Hst Proposal Id #8086 Galaxies
Scientific paper
We propose to obtain STIS G750L slitless spectroscopy and a 50CCD image of the field around the quasar PKS 2200-238 during the Leonid meteor shower to identify high redshift galaxies associated with Lyman-alpha and metal absorption systems in the quasar spectrum. Our key aim is to achieve the direct optical identification of high redshift galaxies which produce absorption against the background QSO. Whilst there are many direct detections of Lyman alpha absorbing galaxies at low-intermediate redshifts {z<0.7; see Lanzetta et al 1995, ApJ, 442, 538}, there are currently no direct identifications of galaxies giving rise to Lyman-a forest lines at high redshifts. It is important to do this in order to understand the nature of Lyman forest absorbers over all redshifts, particularly in light of recent results claiming the existence of a break in the redshift distribution {dn/dz} for Lyman-a forest absorbers around z=1.7 {Weymann et al 1998, ApJ, 506}. Such a feature in the redshift distribution might indicate the onset of a new population of objects. The observations proposed here will address this issue.
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