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Astron. Astrophys. 345, 43-48 (1999)

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The X-ray emission from broad absorption line quasars

W. Brinkmann 1, T. Wang 2,3, M. Matsuoka 2 and W. Yuan 1,4

1 Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, D-85740 Garching, Germany
2 Cosmic Radiation Laboratory, RIKEN, 2-1 Hirosawa, Wako-shi Saitama 351-01, Japan
3 Center for Astrophysics, University of Science and Technology of China, Heifei, 230026, P.R. China
4 Yunnan Observatory, CAS, P.O. Box 110, Kumming, Yunnan 6500011, P.R. China

Received 19 November 1998 / Accepted 16 February 1999


Pointed ASCA observations as well as archival ROSAT data are used for a study of the X-ray emission of the three BAL Quasars LBQS 2212-1759, PG 1411+442, and PG 0043+039. All three objects are found to be X-ray quiet, possibly due to substantial intrinsic absorption with [FORMULA] cm-2 but might have intrinsically a more typical spectral energy distribution. This picture is supported by explicit spectral fits to the combined ROSAT/ASCA data of the nearby bright object PG 1411+442. An analysis of the large number of radio-quiet quasars not detected in the ROSAT All-Sky Survey indicates that perhaps only a small fraction of BAL quasars have not been recognized before and that the number of intrinsically X-ray quiet quasars must be small.

Key words: X-rays: galaxies – galaxies: quasars: general – galaxies: active

Send offprint requests to: W. Brinkmann (wpb@rzg.mpg.de)

© European Southern Observatory (ESO) 1999

Online publication: April 12, 1999