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2013ApJS..209....1F - Astrophys. J., Suppl. Ser., 209, 1 (2013/November-0)

Determining inclinations of active galactic nuclei via their narrow-line region kinematics. I. Observational results.


Abstract (from CDS):

Active galactic nuclei (AGNs) are axisymmetric systems to first order; their observed properties are likely strong functions of inclination with respect to our line of sight (LOS). However, except for a few special cases, the specific inclinations of individual AGNs are unknown. We have developed a promising technique for determining the inclinations of nearby AGNs by mapping the kinematics of their narrow-line regions (NLRs), which are often easily resolved with Hubble Space Telescope [O III] imaging and long-slit spectra from the Space Telescope Imaging Spectrograph. Our studies indicate that NLR kinematics dominated by radial outflow can be fit with simple biconical outflow models that can be used to determine the inclination of the bicone axis, and hence the obscuring torus, with respect to our LOS. We present NLR analysis of 53 Seyfert galaxies and the resulting inclinations from models of 17 individual AGNs with clear signatures of biconical outflows. Our model results agree with the unified model in that Seyfert 1 AGNs have NLRs inclined further toward our LOS than Seyfert 2 AGNs. Knowing the inclinations of these AGN NLRs, and thus their accretion disk and/or torus axes, will allow us to determine how their observed properties vary as a function of polar angle. We find no correlation between the inclinations of the AGN NLRs and the disks of their host galaxies, indicating that the orientation of the gas in the torus is independent of that of the host disk.

Abstract Copyright:

Journal keyword(s): galaxies: active - galaxies: individual (Akn 564, Circinus, IC 3639, IRAS 11058-1131, MCG-6-30-15 , Mrk 34, Mrk 279, Mrk 348, Mrk 463e, Mrk 493, Mrk 509, Mrk 705, Mrk 766, Mrk 1040, Mrk 1066, NGC 1358, NGC 1386, NGC 1667, NGC 2110, NGC 2273, NGC 3081, NGC 3227, NGC 339, NGC 3516, NGC 3783, NGC 4051, NGC 4303, NGC 4395, NGC 4507, NGC 5135, NGC 525, NGC 5283, NGC 5347, NGC 5427, NGC 5506, NGC 5548, NGC 5643, NGC 5695, NGC 572, NGC 5929, NGC 6300, NGC 7212, NGC 7469, NGC 7674, NGC 7682, NGC 788, UM 146) - galaxies: kinematics and dynamics - galaxies: Seyfert

Status at CDS:  

Simbad objects: 57

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