Computer Science
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10437b&link_type=abstract
HST Proposal ID #10437
Computer Science
Hst Proposal Id #10437 Quasar Absorption Lines And Igm
Scientific paper
This proposal is to complete our program to identify the galaxies responsible for the damped Lyman-alpha absorption systems {DLAs} at high redshift. By combining both STIS {GO-8172, Moller et al. 2002} and NICMOS {GO-7824, Warren et al. 2001} imaging with ground-based spectroscopy, we have been able to develop a picture which unifies DLA galaxies and Lyman-break galaxies {Moller et al. 2002}. However, the NICMOS observations failed {due to guide star problems} for a key target - the three z>3 DLAs along the sightline of QSO PC0953+4749. Of all the NICMOS targets in our DLA program, PC0953+4749 is potentially the best, because it is the faintest quasar, allowing us to probe the smallest impact parameters. Our Keck spectroscopy has revealed Lyman-alpha emission from the z=3.4 DLA {Bunker et al. 2004} - the highest-redshift example yet found. We also have a tentative detection of H-beta for this system from UKIRT near-IR spectroscopy. NICMOS observations will enable us to quantify the effects of dust and will provide the all-important sizes and morphologies in the rest-frame optical down to H=26 at 5sigma. HST resolution is essential because the Lyman-alpha emission source at z=3.4 has an impact parameter of only 0.4"
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