Other
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.218..685p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 218, Feb. 15, 1986, p. 685-694.
Other
52
Exosat Satellite, Radiant Flux Density, Seyfert Galaxies, X Ray Spectra, Emission Spectra, Infrared Spectra, Line Spectra, Spectral Energy Distribution, Ultraviolet Spectra
Scientific paper
EXOSAT observations of the Seyfert galaxy NGC 4151 over the period 1983 July - 1984 April have revealed a steeply decreasing flux in the 2 - 10 keV band. Other observations have shown that this coincided with a fall in the whole infrared-to-ultraviolet continuum and a marked weakening of the broad emission lines. The X-ray spectral shape, however, remained unchanged, although - 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 about 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. It is suggested that this soft component may be thermal emission from a hot intercloud medium in the narrow emission line region.
Culhane Leonard J.
de Korte Piet A. J.
Pounds Kenneth A.
Warwick Robert S.
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