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Issue A&A Volume 417, Number 1, April I 2004 Page(s) 61 - 70 Section Extragalactic astronomy DOI 10.1051/0004-6361:20034517

A&A 417, 61-70 (2004)
DOI: 10.1051/0004-6361:20034517

Intrinsic absorbers in BL Lac objects: The XMM-Newton view

A. J. Blustin, M. J. Page and G. Branduardi-Raymont

MSSL, University College London, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UK
(Received 15 October 2003 / Accepted 15 December 2003)

Abstract
We present XMM-Newton observations of four BL Lac objects ( 1H1219+301 , H1426+428 , Markarian 501 and  PKS 0548-322) , which have been found with past X-ray missions to contain evidence of broad soft X-ray absorption features. Observations with the high resolution Reflection Grating Spectrometers on XMM-Newton provide the best chance yet of investigating these features. No broad absorption features are observed in any of the objects. Neither do we find convincing evidence for narrow emission and absorption lines in the RGS spectra. We discuss the history of observations of broad absorption features in these four objects, finding that if the features exist then they must be transient, and that - given the frequency of reported observations of them - we can rule out the existence of transient broad absorption features in these objects at 93% confidence.

Key words: galaxies: active -- galaxies: BL Lacertae objects: individual: 1H1219+301, H1426+428, Markarian 501, PKS 0548-322 -- X-rays: galaxies

Offprint request: A. J. Blustin, ajb@mssl.ucl.ac.uk

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