The contribution of faint active galactic nuclei to the hard X-ray background

@article{Fiore1999TheCO,
  title={The contribution of faint active galactic nuclei to the hard X-ray background},
  author={Fabrizio Fiore and Fabio La Franca and Paolo Giommi and Martin Elvis and Giorgio Matt and Andrea Comastri and Silvano Molendi and I. Gioia BeppoSAX Science Data Center Osservatorio As Astronomy and Hawaii},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={1999},
  volume={306}
}
  • F. Fiore, F. Franca, Hawaii
  • Published 30 March 1999
  • Physics
  • Monthly Notices of the Royal Astronomical Society
Hard X-ray selection is the most efficient way to discriminate between accretion-powered sources, such as active galactic nuclei (AGN), and sources dominated by starlight. Hard X-rays are also less affected than other bands by obscuration. We have therefore carried out the BeppoSAX High Energy Large Area Survey (HELLAS) in the largely unexplored 5–10 keV band, finding 180 sources in ∼50 deg2 of sky with flux≳5×10−14 erg cm−2 s−1. After correction for the non-uniform sky coverage this… 
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