The hard X-ray spectrum of NGC 4151

Details The hard X-ray spectrum of NGC 4151 The hard X-ray spectrum of NGC 4151

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.195..241c&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 195, Apr. 1981, p. 241-244. Research supported by the Science Research

Astronomy and Astrophysics

Astronomy

11

Galactic Radiation, Seyfert Galaxies, Spaceborne Astronomy, X Ray Sources, X Ray Telescopes, Black Holes (Astronomy), Compton Effect, Gamma Rays, Magnetohydrodynamic Turbulence, Turbulent Heat Transfer

Scientific paper

Observations of the X-ray emitting Seyfert galaxy NGC4151 by the scintillation telescope (ST) on board the satellite Ariel V are discussed. The ST operated over the photon energy range 26 to 1200 keV. The high energy results are compared with previous observations and confirm that variations in the photon range of 2 keV to 1 MeV are no more than a factor of two to three. This observation is consistent with that seen in low energy X-rays and all other wavelengths except gamma rays. The low variability of NGC4151 is significantly different from the observations of the radio galaxy Centaurus A, which shows large variations in the hard X-ray spectral band. This difference between two candidates for massive black hole theories is not yet explainable by present theoretical understanding.

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