S. Mathur et al 2000 ApJ 533 L79 doi:10.1086/312617
Thomson Thick X-Ray Absorption in a Broad Absorption Line Quasar, PG 0946+301
FREES. Mathur1,2, P. J. Green2, N. Arav3, M. Brotherton4, M. Crenshaw5, M. deKool6, M. Elvis2, R. W. Goodrich7, F. Hamann8, D. C. Hines9, V. Kashyap2, K. Korista10, B. M. Peterson1, J. C. Shields11, I. Shlosman12, W. van Breugel13 and M. Voit14
Show affiliationsWe present a deep ASCA observation of a broad absorption line quasar (BALQSO) PG 0946+301. The source was clearly detected in one of the gas imaging spectrometers, but not in any other detector. If BALQSOs have intrinsic X-ray spectra similar to normal radio-quiet quasars, our observations imply that there is Thomson thick X-ray absorption (NH 
1024 cm-2) toward PG 0946+301. This is the largest column density estimated so far toward a BALQSO. The absorber must be at least partially ionized and may be responsible for attenuation in the optical and UV. If the Thomson optical depth toward BALQSOs is close to 1, as inferred here, then spectroscopy in hard X-rays with large telescopes like XMM would be feasible.
- Subject headings
galaxies: active; quasars: absorption lines; quasars: individual (PG 0946+301); X-rays: galaxies
- Dates
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Issue 2 (2000 April 20)
Received 2000 February 1, accepted for publication 2000 March 1
Published 2000 March 24
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Thomson Thick X-Ray Absorption in a Broad Absorption Line Quasar, PG 0946+301
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