X-ray observations of the bright Seyfert galaxy IC 4329A

Details X-ray observations of the bright Seyfert galaxy IC 4329A X-ray observations of the bright Seyfert galaxy IC 4329A

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...377..417s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 377, Aug. 20, 1991, p. 417-425.

Astronomy and Astrophysics

Astronomy

9

Active Galactic Nuclei, Brightness Distribution, Seyfert Galaxies, X Ray Astronomy, X Ray Spectra, Exosat Satellite, Satellite Observation, Spectrum Analysis

Scientific paper

A detailed analysis of two Exosat observations of the Seyfert galaxy IC 4329A is presented which reveals long-term and short-term X-ray intensity variations. Intensity variations of about 35 percent on a time scale of 1 yr and about 12 percent on a time scale of about 20,000 sec are detected. The observed X-ray spectra are well fitted by simple power-law models without any indication for low-energy excess. The observed value of N(H) is nearly 10 times larger absorption than the Galactic value, implying the presence of considerable absorption local to the source and consistent with the reddening observed in the optical spectrum. The photon indices lies in the range 1.7-1.9 with evidence for variability at the 90 percent confidence level.

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