Repeated X-ray flaring in NGC 4151

Research output: Contribution to journalArticlepeer-review


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.
Original languageEnglish
Pages (from-to)83-94
JournalMonthly Notices of the Royal Astronomical Society
Publication statusPublished - 1 Jul 1980


  • 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


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