The soft X-ray spectrum of NGC 4151 |
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| Authors: | K A Pounds R S Warwick J L Culhane P de Korte |
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| Institution: | (1) X-ray Astronomy Group, University of Leicester, Leicester, UK;(2) Mullard Space Science Laboratory, Dorking, Surrey, UK;(3) Laboratory for Space Research, Leiden, The Netherlands |
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| 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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