Other
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7290b&link_type=abstract
HST Proposal ID #7290
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Hst Proposal Id #7290 Quasar Absorption Lines
Scientific paper
The distinction between Lyman alpha and heavy element absorbers towards QSOs has become fuzzy after the discovery by Cowie et al. {1995, AJ, 109, 1522} that about one half of Lyman-alpha absorbers with HI column density larger than 3* 10^14, cm^-2 show CIV absorption as well. On the other hand, on-going imaging and spectroscopic surveys in the fields of HST/FOS target QSOs demonstrate that a large fraction of Lyman-alpha absorbers at low redshifts arise in gaseous envelopes of galaxies at galactocentric radii of up to 160 kpc {H_0=100 km/s/Mpc is used throughout}. In contrast, only some of the galaxies being crossed by the QSO light at an impact parameter of less than 65 kpc show CIV absorption in the HST/FOS spectra. Here we propose to use STIS to search for CIV absorption associated with the Lyman-alpha absorbing galaxies at galactocentric distances in the range 100-500 kpc. Detection of such absorption features would imply that the halo gas of these galaxies has been enriched by either some sort of galactic fountain or in-situ halo star formation and would also determine up to which radius this process has operated.
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