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EXOSAT Observations of Flux and Spectral Variability in the Seyfert Galaxy NGC5548

Published online by Cambridge University Press:  07 August 2017

G. Branduardi-Raymont
G. Branduardi-Raymont*
Affiliation:
Mullard Space Science Laboratory, University College London, Holmbury St Mary, Dorking, Surrey, UK

Extract

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The Seyfert galaxy NGC5548 was observed with EXOSAT 12 times between February 1984 and March 1986. The bottom panel of Fig. 1 shows the lightcurves obtained with the Low Energy telescope and CMA detector and the Medium Energy proportional counters. The CMA flux doubled in a month at the beginning of the EXOSAT coverage, and was down by more than an order of magnitude 15 months later; the source was again in a high state in January and March 1986. The ME lightcurve mirrors that of the CMA, with L2–6 keV varying between 1 and 5 × 1043 erg s−1.

Type
Part 3: X-rays and the Central Source
Information
Symposium - International Astronomical Union , Volume 134: Active Galactic Nuclei , 1989 , pp. 177 - 178
Copyright
Copyright © Kluwer 1989 

References

Fabian, A.C. et al. 1986, M.N.R.A.S., 221, 931.Google Scholar
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Reichert, G.A. and Peterson, B.M. 1988, Proceedings of the Georgia State Workshop on ‘AGN Variability’, in press.Google Scholar