X-Ray Spectrum of the BL Lacertae Object PKS 0548-322 Observed with GINGA

Details X-Ray Spectrum of the BL Lacertae Object PKS 0548-322 Observed with GINGA X-Ray Spectrum of the BL Lacertae Object PKS 0548-322 Observed with GINGA

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995pasj...47..131t&link_type=abstract

Publications of the Astronomical Society of Japan, v.47, p.131-140.

Astronomy and Astrophysics

Astronomy

29

Bl Lacertae Objects, Galaxies: Active, Galaxies: Individual (Pks 0548-322), X-Rays: Spectra

Scientific paper

The BL Lac object PKS 0548-322 was observed in X-rays with Ginga five times between 1990 January and 1991 March. The 2--20 keV flux varied by a factor of 2.5, and the spectral energy index alpha showed a significant change of between 0.8 +/- 0.02 and 1.03 +/- 0.04. No simple relation has been found between the flux and the spectral index. An upper limit for the equivalent width of the iron K line is 83 eV at 90% confidence. Based on the spectral results, we propose a simple scheme to interpret the variation of the X-ray spectrum in terms of the synchrotron emission. This gives new constraints on the properties of the emission region.

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