X-Ray Absorption in Moderate Redshift Damped Lyman Alpha Galaxies

Details X-Ray Absorption in Moderate Redshift Damped Lyman Alpha Galaxies X-Ray Absorption in Moderate Redshift Damped Lyman Alpha Galaxies

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cxo..prop..143b&link_type=abstract

Chandra Proposal ID #01700742

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Chandra Proposal Id #01700742

Scientific paper

We propose to measure the X-ray absorbing column associated with moderate redshift, intervening damped Lyman alpha and 21-cm quasar absorption line systems. The advantage of the X-ray absorption is that it gives a measure of the metal column density (mainly oxygen) and hence abundance, which is independent of ionization, inclusion of the atoms in a molecule, or depletion onto dust grains. We estimate that we will detect absorption if the gas is 1/8 solar or greater for one system at z=0.3 and 1/4 solar or greater for another at z=0.4. For two other objects, we request short exposures with ACIS-S to measure the spectral energy distribution in order to access the feasibility of future grating observations.

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