Mathematics – Logic
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000hst..prop.8570s&link_type=abstract
HST Proposal ID #8570
Mathematics
Logic
Hst Proposal Id #8570 Quasar Absorption Lines And Igm
Scientific paper
-0.15truein Recently, the nearby star-forming dwarf galaxy SBS 1543+593 {z=0.009} was discovered to be superimposed upon the bright quasar HS 1543+5921 {z 0.8, m_B=16.8}. Very few such alignments are known, making HS 1543+5921/SBS 1543+593 a unique system for absorption-line studies with HST. In order to investigate the properties of SBS 1543+593 and determine the utility of future work, we request 2 orbits for a small pilot project. First, we propose to obtain a STIS spectrum which will allow us to determine the HI column density in the sight-line through the dwarf. Second, we propose to obtain a near-UV image of SBS 1543+593 with WFPC2 {to be used with ground-based images}. The image will allow us to ascertain the dwarf galaxy's morphological type {spiral or irregular}, details of its star formation, and investigate whether amplification bias due to the gravitational lens effect plays a role in the appearance of this improbable alignment. An exciting discovery which might result from this study is that SBS 1543+593 gives rise to a damped LyAlpha {DLA} absorption line in the spectrum of the background quasar. DLA absorbers are the reservoirs of most of the observable neutral gas mass in the Universe at higher redshifts, yet few have been directly matched with galaxies so far. There is a clear need to seize the opportunity presented by HS 1543+5921/SBS 1543+593, since a positive outcome would increase the sample of well-resolved nearby DLA galaxies.
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