NASA NTRS · 19790046025
X-ray observations of BL Lac objects
Abstract
The BL Lac objects MK501 and MK421 have been observed by the HEAO-1 experiment A-2 in the 2-60-keV band. Their spectra are similar with best-fitting power laws having an energy index between -0.2 and 0.2. There was no detectable X-ray absorption with implied column densities of less than 1.5 x 10 to the 22nd H atoms/sq cm. MK421 was a factor 6 weaker in November 1977 then in May 1977. A new identification of PKS0548-322 with a source near 4U 0543-31 is suggested.
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Mushotzky, R. F., Boldt, E. A., Holt, S. S., Serlemitsos, P. J., Swank, J. H., Rothschild, R. H., Pravdo, S. H.. 1978-01-01. X-ray observations of BL Lac objects. https://ntrs.nasa.gov/citations/19790046025
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