QSO Absorption System Snap Shot Survey-Part 2 OF 3: Cycle 3 High

Details QSO Absorption System Snap Shot Survey-Part 2 OF 3: Cycle 3 High QSO Absorption System Snap Shot Survey-Part 2 OF 3: Cycle 3 High

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993hst..prop.4952t&link_type=abstract

HST Proposal ID #4952

Physics

Hst Proposal Id #4952 Quasars &Amp, Agn

Scientific paper

A snap shot survey with the HST FOS can readily provide a wealth of information on four different types of QSO absorption systems, all of which have strong spectral signatures. Lyman limit systems include a large fraction of all metal line systems which arise in galaxy halos, plus those intergalactic clouds with the largest HI column densities. Damped Lyman-alpha systems probably arise in galactic disks. They are 10 times rarer, but they have the largest column densities, and are the most interesting of systems. Strong Associated CIV systems arise in high ionization gas which is physically connected to the individual QSOs, as do the ejected Broad Absorption Line systems. We show that we can readily produce samples of each of these four types of systems which are twice the size of the existing samples. These systems sample gas in a wide variety of environments: intergalactic clouds, galactic halos, galactic disks, the neighbourhood of the QSO, and gas ejected from the QSOs. The follow-up potential is enormous. All of the rarer types of system will each be studied in detail in future. We will learn about the origin, redshift evolution, ionization, and the metal abundances of absorption systems. A quick look at many targets, providing a primary sample for follow-up investigations, is an optimal way to spend HST time prior to COSTAR.

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