Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996hst..prop.6712w&link_type=abstract
HST Proposal ID #6712
Physics
Hst Proposal Id #6712 Qso Absorption Lines
Scientific paper
The origin of the Lyman-Alpha clouds has been a subject ofintense recent activity. The launch of HST made it possiblefor the first time to make direct identification of objects atlow/intermediate redshift which give rise to Lyman-Alphaabsorption towards a bright background QSO. Using acombination of HST QSO spectra and ground-based multi-slitspectroscopy, we have shown that many Lyman-Alpha clouds arisein gigantic gaseous envelopes around galaxies. Our analysis sofar has been based on HST FOS QSO spectra, where the weakestabsorption systems typically detected are ~ 0.3Angstrom, whichcan arise around galaxies at impact parameters of out to 160h^-1 kpc. In order to properly understand the nature of gasin and around galaxies we must now explore how far out fromthe galaxy centre this incredibly tenuous gas extends. To dothis, we wish to obtain GHRS spectra of two particularlyinteresting QSOs, centred on fields where we have alreadycarried out extensive multi-slit redshift surveys, to searchfor weak Lyman-Alpha absorption associated with the galaxies.Detections or non-detections of absorption associated withgalaxies greater than 160 h^-1 kpc will both place fundamentalnew constraints on the nature of these gigantic gaseousenvelopes around galaxies.
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