X-ray observations of BL Lacertae objects

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

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...226l..65m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 226, Dec. 1, 1978, p. L65-L67.

Astronomy and Astrophysics

Astronomy

69

Bl Lacertae Objects, X Ray Sources, X Ray Spectra, Heao 1, Oso-8, Spaceborne Astronomy

Scientific paper

Results are reported for OSO 8 and HEAO 1 X-ray observations of the BL Lac objects Mrk 421, Mrk 501, and PKS 0548-322 over the energy range from 2 to 60 keV. It is found that the X-ray spectra of Mrk 421 and 501 are similar, exhibit statistically significant soft X-ray excesses, lack low-energy absorption, and are best fitted by power laws over the 2-30-keV range with respective photon indices of approximately 0.91 and 1.2 and respective hydrogen column densities of less than 8 x 10 to the 21st per sq cm and no more than 1.8 x 10 to the 22nd per sq cm. It is noted that the spectral index for both sources is identical, within errors, to the HF radio spectral index and that Mrk 421 experienced a factor of 6 decrease in the 2-10-keV band over a six-month period. A tentative identification of PKS 0548-322 with the source H0548-32 is suggested.

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