Computer Science
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997hst..prop.7294c&link_type=abstract
HST Proposal ID #7294
Computer Science
Hst Proposal Id #7294 Quasar Absorption Lines
Scientific paper
AO 0235+164 is a BL Lac object, the line of sight to which passes close to two luminous objects. One of these objects {or both} produces a unique variable 21 cm absorption line system. Observations of the Ly-alpha absorption line at 1853Angstrom in the spectrum of AO 0235+164 will yield the H I column density, providing a measurement of spin temperature in the absorber. When combined with observations of weak metal lines obtained at the Keck Observatory, an absolute measurement of the gas phase metal abundances in a galactic disk at z=0.524 will be obtained. This can be compared with the total metal abundance measured from X-ray absorption to yield a dust-to-gas ratio. Comparison of the continuum shape with new X-ray continuum observations {which can be scheduled simultaneously due to the flexibility of the Asca scheduling system} will measure the extinction. A comparison of the extinction with both the total abundance of metals and the gas phase abundance will be unique. HST spectroscopic observations are required because the Ly-alpha line lies in the UV.
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