The z = 0.93 DLA in the Gravitationally Lensed QSO HE 0512-3329: a Test of Dust Bias in DLA Samples

Details The z = 0.93 DLA in the Gravitationally Lensed QSO HE 0512-3329: a Test of Dust Bias in DLA Samples The z = 0.93 DLA in the Gravitationally Lensed QSO HE 0512-3329: a Test of Dust Bias in DLA Samples

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9076p&link_type=abstract

HST Proposal ID #9076

Mathematics

Probability

Hst Proposal Id #9076 Quasar Absorption Lines And Igm

Scientific paper

Gregg et al have recently discovered that the bright QSO HE 0512-3329 is gravitationally lensed into two closely separated images and that the lensing galaxy is in all probability a damped LyAlpha system at z_ abs = 0.9313. Here we request two HST orbits to use STIS to record the profile of the LyAlpha absorption line with sufficient S/N to deduce the column density of H I. This observation will make it possible to measure, for the first time, the abundances of several elements--including Zn, Cr, Fe, Si, and Mn--close {2-3 kpc} to the nucleus of a galaxy at z eq 1. There is a suspicion that DLAs at such close impact parameters may be missing from current samples due to dust obscuration, but this obstacle is overcome in this case by the boost provided by gravitational lensing. Establishing whether the metallicity of the galaxy is close to solar, as expected, will provide the first indication of the importance of dust in biasing absorption studies of the universe at z <=q 1. In addition the resolved STIS spectra along the two sight-lines will probe the spatial structure of a DLA on small scales; no such measurement has been performed before.

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