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      Modelling broad emission lines in active galactic nuclei

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          Abstract

          Broad Emission Lines are the most characteristic features of Active Galaxies, but the mechanism of creating a medium able to emit these intense lines is not quite clear. Observations clearly indicate that the motion of the material is predominantly Keplerian, with traces of inflow and outflow, but this still does not point out whether the lines partially come from the disk surface, or exclusively from the circumnuclear material, and whether this material originates from the disk as a wind, or comes, at least partially, from outside. I review the basic scenarios for the formation of the Broad Line Region (BLR), and the recent progress in modelling the physical conditions in the emitting medium. The current state is the the outer radius of the BLR is fixed by the dust sublimation temperature in the medium exposed to the irradiation from the central source, the inner radius is likely fixed by the dust sublimation temperature in the atmosphere of the non-illuminated accretion disk, and the local cloud density is a universal number fixed by the radiation pressure confinement. The time-dependent aspects of the BLR formation, however, still wait for serious modelling effort matching the quality of the observational data.

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          Journal
          02 August 2019
          Article
          1908.00742
          3fd7f32e-f45e-4932-bc40-4337e9c031e9

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

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          submitted to Open Astronomy, Proceedings of the conference 12th Serbian Conference on Spectral Line Shapes in Astrophysics, Vrdnik, Serbia, June 3-7, 2019. Comments wellcome!
          astro-ph.GA

          Galaxy astrophysics
          Galaxy astrophysics

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