Coronal-Line Forest AGN: the best view of the inner edge of the AGN torus?

We introduce Coronal-Line Forest active galactic nuclei (CLiF AGN), AGN which have a rich spectrum of forbidden high-ionization lines (FHILs, e.g. [Fe vii], [Fe x] and [Ne v]), as well as relatively strong narrow (∼300 km s−1) Hα emission when compared to the other Balmer transition lines. We find t...

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Published in:Monthly notices of the Royal Astronomical Society 2015-04, Vol.448 (3), p.2900-2920
Main Authors: Rose, Marvin, Elvis, Martin, Tadhunter, Clive N.
Format: Article
Language:English
Subjects:
Active galactic nuclei
Astronomy
Density
Dust
Emission
Emissions
Emittance
Forests
Ions
Kinematics
Photoionization
Stars & galaxies
Strength
Walls
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description We introduce Coronal-Line Forest active galactic nuclei (CLiF AGN), AGN which have a rich spectrum of forbidden high-ionization lines (FHILs, e.g. [Fe vii], [Fe x] and [Ne v]), as well as relatively strong narrow (∼300 km s−1) Hα emission when compared to the other Balmer transition lines. We find that the kinematics of the CLiF emitting region are similar to those of the forbidden low-ionization emission-line (FLIL) region. We compare emission line strengths of both FHILs and FLILs to cloudy photoionization results and find that the CLiF emitting region has higher densities (104.5 
doi_str_mv 10.1093/mnras/stv113
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We find that the kinematics of the CLiF emitting region are similar to those of the forbidden low-ionization emission-line (FLIL) region. We compare emission line strengths of both FHILs and FLILs to cloudy photoionization results and find that the CLiF emitting region has higher densities (104.5 < n H < 107.5 cm−3) when compared to the FLIL emitting region (103.0 < n H < 104.5 cm−3). We use the photoionization results to calculate the CLiF regions radial distances (0.04 < R CLiF < 32.5 pc) and find that they are comparable to the dust grain sublimation distances (0.10 < R SUB < 4.3 pc). 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We compare emission line strengths of both FHILs and FLILs to cloudy photoionization results and find that the CLiF emitting region has higher densities (104.5 < n H < 107.5 cm−3) when compared to the FLIL emitting region (103.0 < n H < 104.5 cm−3). We use the photoionization results to calculate the CLiF regions radial distances (0.04 < R CLiF < 32.5 pc) and find that they are comparable to the dust grain sublimation distances (0.10 < R SUB < 4.3 pc). As a result, we suggest that the inner torus wall is the most likely location of the CLiF region, and the unusual strength of the FHILs is due to a specific viewing angle giving a maximal view of the far wall of the torus without the continuum being revealed.]]></abstract><cop>London</cop><pub>Oxford University Press</pub><doi>10.1093/mnras/stv113</doi><tpages>21</tpages><oa>free_for_read</oa></addata></record>
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subjects Active galactic nuclei
Astronomy
Density
Dust
Emission
Emissions
Emittance
Forests
Ions
Kinematics
Photoionization
Stars & galaxies
Strength
Walls
title Coronal-Line Forest AGN: the best view of the inner edge of the AGN torus?
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