X-ray variability of BL Lac objects - H2155-304 and PKS 0548-322

Astronomy and Astrophysics – Astronomy

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Bl Lacertae Objects, Light Curve, Spaceborne Astronomy, X Ray Sources, Heao 2, Image Resolution, Proportional Counters, Variability, X Ray Spectra

Scientific paper

X-ray emission from two BL Lacertae objects (H2155-304 and PKS 0548-322) has been studied with the High-Resolution Imager and Monitor Proportional Counter (MPC) on the Einstein Observatory. The high-spatial-resolution observations confirm the identification of these X-ray sources with the BL Lac objects and give a source size less than about 2 arcsec. Variations in the X-ray intensity and spectrum of these sources were detected over time scales of a few hours from analysis of the MPC observations.

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