EXOSAT observations of the Seyfert galaxy NGC 7469 - Rapid hard X-ray variability and a soft X-ray excess

Details EXOSAT observations of the Seyfert galaxy NGC 7469 - Rapid hard X-ray variability and a soft X-ray excess EXOSAT observations of the Seyfert galaxy NGC 7469 - Rapid hard X-ray variability and a soft X-ray excess

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.223p..29b&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 223, Dec. 1, 1986, p. 29P-35P.

Astronomy and Astrophysics

Astronomy

33

Exosat Satellite, Seyfert Galaxies, X Ray Astronomy, Galactic Nuclei, Interstellar Matter, Spectrum Analysis, Starburst Galaxies, Supernova Remnants, Variability

Scientific paper

The results of a series of EXOSAT observations of the Seyfert 1 (and starburst) galaxy NGC 7469 performed in July 1984 are presented. During one observation, hard X-ray variability by a factor 2 within 5 hr was found, while the soft X-ray intensity remained constant. In addition the spectral data indicate an excess of soft X-ray emission over that expected from extrapolation of the hard X-ray continuum. There is no evidence for any variability of this soft excess. An extranuclear origin associated with the starburst region seems unlikely, as is soft X-ray emission from any hot confining intercloud medium in the Seyfert narrow-line and broad-line regions, due to the high (greater than 5 x 10 to the 43rd erg/s) luminosity involved in this soft excess. However, soft X-ray emission from a hot optically thin wind cannot be excluded. An alternative is an extra soft X-ray component from the compact nucleus itself.

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