Constraints on a soft X-ray excess in the quasar 3C 279 |
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Authors: | A. J. Lawson,& I. M. MHardy |
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Affiliation: | Department of Physics &38;Astronomy, University of Southampton, University Road, Southampton SO17 1BJ |
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Abstract: | We present the results of a three-week daily monitoring campaign of the quasar 3C 279 by the X-ray satellites RXTE ROSAT . A cross-correlation provides no evidence for any time lag between the very similar soft and hard X-ray light curves, and the source shows no significant spectral variability over the observing period. There is no evidence to support the presence of a soft excess, with a 99 per cent upper limit on any such component of 25 per cent of the total observed luminosity in the 0.1–2 keV band (<3 × 1038 W). This fraction (but not the luminosity) is significantly lower than that of the soft excess observed in 3C 273. |
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Keywords: | galaxies: active quasars: individual: 3C 279 X-rays: galaxies |
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