oft X-ray Variability of the Bright Quasar 3C273

Details oft X-ray Variability of the Bright Quasar 3C273 oft X-ray Variability of the Bright Quasar 3C273

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001japa...22..283k&link_type=abstract

Journal of Astrophysics and Astronomy, Vol. 22, p. 283-292, 2001

Astronomy and Astrophysics

Astrophysics

3

Scientific paper

We present the results from ROSAT observations of 3C273 in the soft X-ray band. The light variation of 3C273 was investigated for three different energy bands of soft, medium, and hard. The maximum variability with a factor of 2 for 551 days was confirmed at all three different bands. This appears to be a periodic variation within the period of roughly 6 months. However, the short-term or micro variation was not so distinct and the light variation of each band did not show any correlation between them. The hardness ratio for hard and soft bands shows irregular variation but there was no correlation between them. There is no distinct variation of the photon index in the case of simple power law model fitting. For power law + free absorption model fitting, the average photon index ( Γ ) is 2.08.

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