Computer Science
Scientific paper
Jul 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003hst..prop.9784b&link_type=abstract
HST Proposal ID #9784
Computer Science
Hst Proposal Id #9784 Quasar Absorption Lines And Igm
Scientific paper
We seek to measure the gas-phase metallicity, dust content, and gas kinematics in the interstellar medium {ISM} of the Low Surface Brightness {LSB} galaxy SBS 1543+593, by observing absorption lines in the spectrum of the background QSO HS 1543+5921. The QSO shines directly through the center of the LSB galaxy, producing a damped Lyman-alpha {DLA} line. This is the lowest redshift DLA system known outside of the local group. Specifically, we wish to use the G140M grating of STIS to: a} determine the metallicity of the interstellar gas in the LSB galaxy by accurately measuring the column densities of neutral hydrogen and sulphur; and b} estimate the amount of dust present from a precise measure of the nickel column density. The grating settings chosen to acomplish these goals will also allow us to: c} characterize the kinematics of cool gas in the disk and halo of the LSB galaxy by observing the line profiles of strong low ionization species {Si II, O I, C I, C II, etc.}; and d} search for absorption from NV which may arise in any highly ionized component of the ISM due to accretion of intragroup gas onto the galaxy.
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