The Pattern of Heavy Element Abundances in a Damped LyAlpha Galaxy

Details The Pattern of Heavy Element Abundances in a Damped LyAlpha Galaxy The Pattern of Heavy Element Abundances in a Damped LyAlpha Galaxy

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9173b&link_type=abstract

HST Proposal ID #9173

Computer Science

Hst Proposal Id #9173 Quasar Absorption Lines And Igm

Scientific paper

We propose to observe the quasar PKS 1127-143 {z=1.18} with the STIS E230M. We have detected X-ray absorption associated with an intervening 21-cm and damped LyAlpha absorber at z=0.312 in its spectrum with Chandra. The advantage of the X- ray measurement is that the derived metallicity is insensitive to ionization, inclusion of an atom in a molecule, or depletion onto grains. The X-ray absorption is mostly due to oxygen, and the abundance agrees with the oxygen abundance of 16-40 lines in a galaxy at the redshift of the absorber. The STIS spectrum will allow us to measure Zn II, an undepleted iron peak element. Comparison of the oxygen group measured in the X-rays with the iron peak nuclei measured by STIS will reveal whether the absorber has a Pop II, halo-type abundance pattern or a Pop I, disk-like abundance pattern. We also request a deep WFPC image so that we can characterize the morphology of the absorbing galaxy.

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