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- W2050196052 abstract "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." @default.
- W2050196052 created "2016-06-24" @default.
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- W2050196052 date "1994-09-01" @default.
- W2050196052 modified "2023-09-27" @default.
- W2050196052 title "Soft X-ray spectrum of BL Lacertae object AO 0235+164 as a tracer of elemental abundances at Z approximately 0.5" @default.
- W2050196052 doi "https://doi.org/10.1086/174593" @default.
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