Abstract
EXOSAT observations of the Seyfert galaxy NGC 4151 over the period July 1983 to April 1984 have revealed a decreasing flux in the 2 – 10 keV band. In accord with previous measurements a power law spectrum attenuated with a simple column of cold gas does not provide a satisfactory spectral fit below ~3 keV, where a lower relative opacity is required. Inclusion of additional low energy data from the EXOSAT telescopes allows the modelling of the absorbing column to be improved and reveals a second, separate, soft X-ray spectral component.
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© 1985 D. Reidel Publishing Company, Dordrecht, Holland
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Pounds, K.A., Warwick, R.S., Culhane, J.L., de Korte, P. (1985). The Soft X-Ray Spectrum of NGC 4151. In: Peacock, A. (eds) X-Ray Astronomy in the Exosat Era. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-5448-9_78
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DOI: https://doi.org/10.1007/978-94-009-5448-9_78
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