Soft X-ray spectrum of BL Lacertae object AO 0235+164 as a tracer of elemental abundances at Z approximately 0.5

Details Soft X-ray spectrum of BL Lacertae object AO 0235+164 as a tracer of elemental abundances at Z approximately 0.5 Soft X-ray spectrum of BL Lacertae object AO 0235+164 as a tracer of elemental abundances at Z approximately 0.5

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...432..554m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 432, no. 2, p. 554-559

Astronomy and Astrophysics

Astrophysics

9

Absorption Spectra, Abundance, Bl Lacertae Objects, Hydrogen, Quasars, X Ray Absorption, X Ray Spectra, Disk Galaxies, Gamma Rays, Interstellar Matter

Scientific paper

We report the soft X-ray spectrum of BL Lac object AO 0235+164, observed with the Einstein Observatory Imaging Proportional Counter (IPC). This object (z = 0.94) has an intervening galaxy (or a protogalactic disk) at z = 0.524 present in the line of sight, producing both radio and optical absorption lines in the background BL Lac continuum. The X-ray spectrum exhibits a substantial soft X-ray cutoff, corresponding to several times that expected from our own Galaxy; we interpret that excess cutoff as due to the intervening galaxy. The comparison of the hydrogen column density inferred from the 21 cm radio data and the X-ray absorption allows, in principle, the determination of the elemental abundances in the intervening galaxy. However, the uncertainties in both the H I spin temperature and X-ray spectral parameters only loosely restrict these abundances to be 2 +/- 1 solar, which even at the lower limit appears higher than that inferred from studies of samples of optical absoprtion-line systems.

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