X-ray intensity and spectral variations in the BL Lac sources H2155-304 and PKS0548-322

Details X-ray intensity and spectral variations in the BL Lac sources H2155-304 and PKS0548-322 X-ray intensity and spectral variations in the BL Lac sources H2155-304 and PKS0548-322

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.227..525a&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 227, July 15, 1987, p. 525-534.

Astronomy and Astrophysics

Astronomy

8

Bl Lacertae Objects, Periodic Variations, Radiant Flux Density, Spaceborne Astronomy, Spectral Energy Distribution, X Ray Spectra, Astronomical Spectroscopy, Heao 1, Heao 2, Light Curve, Satellite-Borne Instruments, Temporal Distribution

Scientific paper

The results from the X-ray observations of two BL Lacertae objects, H2155-304 and PKS0548-322, are presented. The observations were carried out with the HEAO-1 A2 Low Energy Detectors, the High Resolution Imager, and the Monitor Proportional Counter aboard the Einstein Observatory. Correlated X-ray intensity variations of about 20 percent in the 0.15-3.5 keV energy band and about 40 percent in the 1.5-10 keV energy band are observed in H2155-304 over a period of about 8 hr. A factor of two change in the intensity of PKS0548-322 in the 3.5-10 keV energy interval is also detected over a time interval of 1 hr. Variations in the X-ray intensity over a timescale of months and the hardening of the spectrum with increasing intensity are seen in the HEAO-1 A2 data on H2155-304. The shortest observed timescale for the variability is used to derive an upper limit on the mass of the central accreting source in the two BL Lac objects studied here.

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