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X-ray spectral variability of 3C273

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Abstract

3C273 has been monitored by EXOSAT over the period December 1983 to June 1984 in 4 observations. In the December observation the flux was high and the spectrum showed a power law index of 1.5 changing to 0.9 at∼8 keV. In subsequent observations the flux dropped to∼40% of its original value and the hard tail disappeared. In the last observation the LE flux increased by a factor of 2 with no accompanying ME flux increase.

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Authors and Affiliations

  1. X-ray Astronomy Group, University of Leicester, LE1 7RH, Leicester

    M. J. L. Turner

  2. STECF, Garching, West Germany

    T. Courvoisier

  3. University of Tubingen, West Germany

    R. Staubert

  4. University of Palermo, Italy

    D. Molteni

  5. MPE, Garching, W. Germany

    J. Trumper

Authors
  1. M. J. L. Turner
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  2. T. Courvoisier
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  3. R. Staubert
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  4. D. Molteni
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  5. J. Trumper
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Turner, M.J.L., Courvoisier, T., Staubert, R. et al. X-ray spectral variability of 3C273. Space Sci Rev 40, 623–626 (1985). https://doi.org/10.1007/BF00179877

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