Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.192...83l&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 192, July 1980, p. 83-94. Research supported by the Science Research Co
Astronomy and Astrophysics
Astronomy
64
Flares, Galactic Nuclei, Periodic Variations, Seyfert Galaxies, Spaceborne Astronomy, X Ray Sources, X Ray Spectra, Ariel 5 Satellite, Autocorrelation, Data Processing, Gamma Ray Astronomy, Light Curve, Shot Noise, Stellar Luminosity, Variability
Scientific paper
The paper considers long term monitoring by Ariel V of the X-ray source associated with the nucleus of the Seyfert Galaxy NGC4151 which revealed frequent flaring on a time-scale of days. The possibility that all the X-ray emission is contained in flare-like events is discussed within the framework of a shot noise model. This behavior is interpreted in the light of information obtained at other wavelengths, and arguments are advanced to suggest that all emission from 1 keV to 3 MeV arises from the same region of radius of about 10 to the 14th cm. It is also suggested that accretion onto a massive collapsed object is required to explain the efficiency of energy production.
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