Lyman-Alpha Region of QSOS with Strong Absorption Lines: Cycle 4

Details Lyman-Alpha Region of QSOS with Strong Absorption Lines: Cycle 4 Lyman-Alpha Region of QSOS with Strong Absorption Lines: Cycle 4

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994hst..prop.5176b&link_type=abstract

HST Proposal ID #5176

Computer Science

Hst Proposal Id #5176 Quasars &Amp, Agn Quasar Absorption

Scientific paper

FOS spectra have been obtained of the Ly-alpha region of 3 quasars with 21 cm absorption, 3CR 196, PKS 1229-021, and 3CR 286. The absorbing object is almost certainly a galaxy disk in each case. Measurement of the damped Ly-alpha line will determine the H I column density in the 21 cm absorption system, and comparison with 21 cm will yield the spin temperature. The number of contributing components will be determined from existing or new 21 cm observations. Comparison with optical observations will allow the determination of chemical abundances with respect to H for elements with low-ionization lines. Images taken after the new WF/PC installation may identify the absorbing galaxy and, if so, will allow us to characterize the impact parameter and Hubble type of galaxies producing damped Ly-alpha absorption at moderate redshift. Two of these will be done in this proposal.

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