Lyman Alpha clouds toward PKS1302-102.

Details Lyman Alpha clouds toward PKS1302-102. Lyman Alpha clouds toward PKS1302-102.

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8306l&link_type=abstract

HST Proposal ID #8306

Physics

Hst Proposal Id #8306 Quasar Absorption Lines

Scientific paper

We propose to conduct high spectral resolution {DeltaLambda 10 km/s} observations of the low-redshift quasar PKS1302-102 {z_em=0.278}, whose line of sight comprises 20 Lyman Alpha absorbers with HI column densities in excess of 10^14 cm^- 2. Using existing archive FOS data of this quasar, we derived constraints on the average ionization state and metallicity of the absorbers. The constraint is not stringent because the FOS spectrum did not fully resolve the absorption lines. However, when combined with existing upper limits on the local metagalactic ionizing flux, it already suggests that these low-z Lyman Alpha clouds are on average metal-deficient, with Fe/H< -1. At high resolution, the confidence region for the average radiation flux intensity and metallicity would sharpen considerably and yield a reliable estimate of these two physical characteristics; notably, this would yield an estimate of the baryon content of Lyman Alpha clouds at low redshift. Moreover, three int er vening galaxies are present in the field, with impact parameters spanning 40-200 kpc. This line of sight thus provides a unique opportunity, for a relatively low observational cost, to study the morphology and physical conditions of low-z Lyman Alpha clouds, whose nature and origin remain unknown.

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