EXOSAT observations of the BL Lac object Mkn 421 |
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Authors: | R S Warwick I McHardy K A Pounds |
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Institution: | (1) X-ray Astronomy Group, University of Leicester, LE1 7RH Leicester |
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Abstract: | The BL Lac object Mkn 421 was observed by EXOSAT four times over a period of six days in February 1984. Significant X-ray variability was apparent on a timescale of less than a day, but with no accompanying spectral change. The source exhibited a very soft power law X-ray spectrum with an extremely low intrinsic column density (NH1020 cm–2). There was no evidence for an additional hard component attributable to synchrotron self-Compton emission. The observations when combined with other published data imply that significant changes occur in the form of the broad-band UV/X-ray continuum of this source. |
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