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- W1639647538 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." @default.
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- W1639647538 date "1978-08-01" @default.
- W1639647538 modified "2023-09-27" @default.
- W1639647538 title "X-ray observations of BL Lac objects" @default.
- W1639647538 hasPublicationYear "1978" @default.
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