New evidence for keV X-ray variability of QSO 0241 + 622

Astronomy and Astrophysics – Astronomy

Scientific paper

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Quasars, Spaceborne Astronomy, X Ray Sources, Heao 2, Proportional Counters, Temporal Distribution, Variability

Scientific paper

The results of two observations of the X-ray QSO 0241 + 622 were compared, in order to find evidence of X-ray variability in the keV range. The observations were performed using the Imaging Proportional Counter (IPC) instrument on board the Einstein Observatory satellite. Evidence is presented for a variability of more than a factor of two for an IPC flux of 0.5-4.5 keV.

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