Hard X-ray variability of NGC 4151

Details Hard X-ray variability of NGC 4151 Hard X-ray variability of NGC 4151

May 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...373...75p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 373, May 20, 1991, p. 75-79. CNR-supported research.

Astronomy and Astrophysics

Astronomy

16

Crab Nebula, Seyfert Galaxies, X Ray Spectra, Balloon-Borne Instruments, Emission Spectra, X Ray Astronomy

Scientific paper

During a balloon flight on July 15, 1987 of the MIFRASO telescope, a region of the sky containing the Seyfert galaxy NGC 4151 was studied over the photon energy range 15-335 keV. A 13-sigma excess, interpreted as originating from the direction of NGC 4151, was detected in this energy band and the corresponding emission spectrum is represented by a single power law with a photon spectral index of alpha = 1.5 + or - 0.1. With respect to the July 1986 observation of this source with the same telescope, the alpha slope is statistically unchanged, while the X-ray flux in the energy range 27-80 keV shows, at the 95-percent confidence level, an increase of about 40 percent. An observation of the Crab Nebula, that proves the stability of the telescope response through the two measurements of NGC 4151, is also described.

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