On the Intermediate Line Region in AGNs

Tek P. Adhikari, Agata Różańska, Krzysztof Hryniewicz, Bozena Czerny, Gary J. Ferland

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


In this paper we explore the intermediate line region (ILR) by using the photoionisation simulations of the gas clouds present at different radial distances from the center, corresponding to the locations from BLR out to NLR in four types of AGNs. We let for the presence of dust whenever conditions allow for dust existence. All spectral shapes are taken from the recent multi-wavelength campaigns. The cloud density decreases with distance as a power law. We found that the slope of the power law density profile does not affect the line emissivity radial profiles of major emission lines: Hβ, He II, Mg II, C III, and O III. When the density of the cloud at the sublimation radius is as high as 1011.5 cm−3, the ILR should clearly be seen in the observations independently of the shape of the illuminating radiation. Moreover, our result is valid for low ionization nuclear emission regions of active galaxies.

Original languageEnglish
Article number19
JournalFrontiers in Astronomy and Space Sciences
StatePublished - Sep 29 2017

Bibliographical note

Publisher Copyright:
© Copyright © 2017 Adhikari, Różańska, Hryniewicz, Czerny and Ferland.


  • accrection disk
  • active galaxies
  • emission lines
  • photoionisation
  • radiative transfer

ASJC Scopus subject areas

  • Astronomy and Astrophysics


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