X-ray observations of a flare in NGC 4151 from OSO 8

Details X-ray observations of a flare in NGC 4151 from OSO 8 X-ray observations of a flare in NGC 4151 from OSO 8

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...225l.115m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 225, Nov. 1, 1978, p. L115-L118.

Astronomy and Astrophysics

Astronomy

78

Absorption Spectra, Infrared Spectra, Seyfert Galaxies, X Ray Spectra, Astronomical Models, Compton Effect, Fluorescence, Spaceborne Astronomy, Synchrotron Radiation, X Ray Absorption

Scientific paper

The 2-60-keV flux from NGC 4151 has been observed to change by a factor of 2 on a time scale of 1.5 days. No fluctuations in excess of a factor of 3 are detected on time scales less than 4 hours. During a total observation of approximately 11 days there were no statistically significant changes in spectral shape. The spectrum can be fitted by a power law with photon index of about 1.42 + or - 0.06 and a hydrogen column density of approximately 7.5 + or - 0.5 x 10 to the 22nd power atoms/sq cm. A 2-sigma residual to this fit implies fluorescent Fe line emission with an equivalent width of about 240 eV. Both synchrotron self-Compton and thermal Compton models are consistent with the X-ray data.

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