Hard X-ray observations of NGC 4151

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

Jul 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...199l...5b&link_type=abstract

Astrophysical Journal, vol. 199, July 1, 1975, pt. 2, p. L5-L8.

Astronomy and Astrophysics

Astronomy

48

Galactic Radiation, Seyfert Galaxies, Spaceborne Astronomy, X Ray Sources, Astronomical Models, Oso-7, Radiant Flux Density, Uhuru Satellite, X Ray Astronomy, X Ray Spectra, X Ray Telescopes

Scientific paper

The X-ray source 3U 1207 + 39, associated with the Seyfert galaxy NGC 4151, has been scanned repeatedly by the UCSD X-ray telescope on board the OSO-7 satellite. A weak source with a hard spectrum has been unambiguously detected in this region in October 1972, and with lesser statistical significance at other times between November 1971 and May 1973. The photon spectrum in the 7-110 keV range is best fitted by a power law of the form dN/dE = 0.012 E to the exponent negative 1.1 photons per sq cm per second per keV, consistent with the Uhuru measurement in the 2-6 keV range. The hard spectrum observed and very short electron lifetimes implied severely constrained nonthermal models for the emission. An extremely hot gas is also consistent with the observations.

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