X-ray observations of BL Lac objects

Details X-ray observations of BL Lac objects X-ray observations of BL Lac objects

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978stin...7832016m&link_type=abstract

Unknown

Astronomy and Astrophysics

Astrophysics

Astrophysics, X Ray Spectra, Density Measurement, Power Spectra, X Ray Sources

Scientific paper

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 NH 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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