NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-24 T08:28:45 PDT
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For refcode 2013A&A...549A.100K:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
2013A&A...549A.100K The shape of broad-line profiles in active galactic nuclei Kollatschny, W.; Zetzl, M. Abstract. Aims: We present a study of the broad optical/UV emission line profiles in active galactic nuclei (AGN) to get information on the dominant velocity components (turbulence, rotation, etc.) in the central broad-line region (BLR). Methods: We introduce line broadening simulations of emission line profiles and compare these results with the largest homogeneous data set of reverberation-mapped AGN. Results: The underlying broad-line profiles in AGN are Lorentzian profiles caused by turbulence in the line emitting region. The turbulent velocities are different for the different line emitting regions of Hgamma, Halpha, Ly-{alpha}, C III] lambda1909, He II lambda1640, and Si IV lambda1400. The turbulent velocities go from 400 km s^-1^ for Hbeta up to 3800 km s^-1^ for Ly-{alpha} + N v lambda1240. The dominating broadening mechanism of these profiles is broadening due to rotation. The rotation velocities causing the line profile broadening go from 500 km s^-1^ up to 6500 km s^-1^. Here we present interrelations between observed emission line widths (FWHM) and their related rotational velocities to correct for the contribution of the turbulence to the broad-line profiles. Key words: accretion, accretion disks, line: profiles, galaxies: Seyfert, galaxies: active, quasars: emission lines
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