The effect of partial obscuration on the luminosity dependence of the obscured fraction in active galactic nuclei

Jack H. Mayo*, Andy Lawrence

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Surveys of active galactic nuclei (AGN) in different observational regimes seem to give different answers for the behaviour of the obscured fraction with luminosity. Based on the complex spectra seen in recent studies, we note that partial covering could significantly change the apparent luminosities of many AGN, even after apparent X-ray absorption correction. We explore whether this effect could reproduce the observed dependence of the obscured fraction on the apparent X-ray luminosities seen between 2 and 10 keV. We can reproduce the observed trend in a model where 33 per cent of AGN are unobscured, 30 per cent are heavily buried and 37 per cent have a range of intermediate partial coverings. Our model is also tentatively successful at reproducing observed trends in the X-ray versus infrared luminosity ratio for AGN.

Original languageEnglish
Pages (from-to)1593-1598
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Volume434
Issue number2
DOIs
Publication statusPublished - Sep 2013

Keywords

  • galaxies: active
  • galaxies: nuclei
  • quasars: general
  • galaxies: Seyfert
  • X-rays: galaxies
  • XMM-NEWTON OBSERVATIONS
  • SEYFERT 2 GALAXIES
  • X-RAY-ABSORPTION
  • SWIFT-BAT SURVEY
  • OPTICAL SPECTROSCOPY
  • UNIFIED SCHEMES
  • AGN
  • VARIABILITY
  • EVOLUTION
  • NGC-1068

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