X-ray variability of the quasar 3C273

White, Glenn J. and Ricketts, Martin J. (1979). X-ray variability of the quasar 3C273. Monthly Notices of the Royal Astronomical Society, 187 pp. 757–759.

URL: http://adsabs.harvard.edu/abs/1979MNRAS.187..757W


Observations of the quasar 3C273 made during 1975-77 have shown that the X-ray flux varied on a time scale of several months. No similar variation was present in radio and optical data taken at similar times. If this variation results from luminosity variations of a central compact object, then an upper limit of ≤4 x 1017cm can be set on its dimensions.

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