NASA NTRS · 19780024073
X-ray observations of BL Lac objects
Abstract
The BL Lac objects MK501 and MK421 were observed with OSO-8 and HEAO-1 X-ray detectors in the 2-60 keV band. Their spectra are similar with best fitting power laws having energy index -.4 alpha 4. A soft X-ray excess is indicated in their spectra. There was no detectable X-ray absorption with implied column densities N sub H 1.5 x 10 to the 22d power at sq cm. MK421 was a factor 6 weaker in November 1977 than in May 1977. An identification of PKS0548-322 with a new source H0548,-32 is suggested.
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Mushotzky, R. F., Boldt, E. A., Holt, S. A., Pravdo, S. H., Serlemitsos, P. J., Swank, J. H., Rothschild, R. H.. 1978-08-01. X-ray observations of BL Lac objects. https://ntrs.nasa.gov/citations/19780024073
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