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Variability of BL Lac objects at X-ray and other frequencies

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Abstract

EXOSAT observations reveal that daily X-ray variability appears to be a common property of high luminosity BL Lac objects. Results are reported for PKS0735+178, OM280(=1147+245), OQ530(=1418+546), OV-236 (=1921-293) and OJ287(=0851+202). In OJ287, for which we have the most extensive coverage, the amplitude of variability at X-ray frequencies appears to be a factor of a few larger than at longer wavelengths.

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Authors and Affiliations

  1. Dept. of Space Research, University of Birmingham, UK

    A. M. T. Pollock

  2. Dept. of Astronomy, University of Edinburgh, Scotland

    P. W. J. L. Brand

  3. National Radio Astronomy Observatory, Virginia, USA

    J. L. Bregman

  4. Dept. of Astronomy, Preston Polytechnic, UK

    E. I. Robson

Authors
  1. A. M. T. Pollock
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  2. P. W. J. L. Brand
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  3. J. L. Bregman
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  4. E. I. Robson
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Pollock, A.M.T., Brand, P.W.J.L., Bregman, J.L. et al. Variability of BL Lac objects at X-ray and other frequencies. Space Sci Rev 40, 607–612 (1985). https://doi.org/10.1007/BF00179874

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  • DOI: https://doi.org/10.1007/BF00179874

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