Physics
Scientific paper
Jul 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5351b&link_type=abstract
HST Proposal ID #5351
Physics
Hst Proposal Id #5351 Quasars &Amp, Agn Quasar Absorption
Scientific paper
In the past decade, quasar absorption line studies have revealed several important properties of diffuse material distributed in the universe. In particular, damped Ly-alpha absorbers have been found at high redshifts which are assumed to be protogalactic disks. Our goal is to identify this population of absorbers by investigating the nature of 21cm/damped Ly-alpha systems at intermediate z (0.3 to 1). We propose to perform a detailed imaging and spectroscopic study of four 21cm absorbers and three damped Ly-alpha absorber candidates, for which we have acquired subarcsec seeing deep images at CFHT. In six cases, there is an object blended with the quasar image with impact parameters in the range 0.6 to < 3". HST high spatial resolution will give the position, extent, inclination and morphologigal type of the intervening galaxy, and thus the location of the region of the disk/halo probed by the background optical and radio quasar sources. Observations of the damped Ly-alpha absorptions in the quasar spectra will give the HI column densities, which combined with the radio data will allow to derive the HI cloud temperatures and in the cases of extended radio sources the strength of their magnetic fields. The metal absorption lines (CII, CIV and in the optical MgII, MnII, FeII) will be used to relate the properties (ionization level, abundances) of intermediate and high redshift damped Ly-alpha absorbers.
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