Kinematics of the H$\alpha$ and H$\beta$ broad line region in an SDSS sample of type 1 AGNs

Abstract

Here we investigate the kinematics of the part of the broad line region (BLR) in active galactic nuclei (AGNs) emitting H$\beta$ and H$\alpha$ emission lines. We explore the widths and asymmetries of the broad H$\beta$ and H$\alpha$ emission lines in a sample of high quality (i.e. high signal to noise ratio) spectra of type 1 AGN taken from the Data Release 16 of the Sloan Digital Sky Survey, in order to explore possible deviation from the gravitationally bound motion. To find only the broad component of H$\beta$ and H$\alpha$ we use the FANTASY (Fully Automated pythoN Tool for AGN Spectra analYsis) code for the multi-component modeling of the AGN spectra and for careful extraction of the broad emission line parameters. We show that based on the broad line profiles widths and asymmetries, the BLR gas emitting H$\beta$ and H$\alpha$ lines follows similar kinematics, and seems to be virialized in our sample of type 1 AGN.

11 pages, 14 figures, accepted for publication in Monthly Notices of the Royal Astronomical Society

References in corpus (8)

• A Catalog of Quasar Properties from SDSS DR7
• The diversity of quasars unified by accretion and orientation
• A Reverberation-Based Mass for the Central Black Hole in NGC 4151
• The flux ratio of the [OIII] 5007,4959 lines in AGN: Comparison with theoretical calculations
• The structure of the Mg II broad line emitting region in Type 1 AGNs
• A flare in the optical spotted in the changing-look Seyfert NGC 3516
• Tracing the outflow kinematics in Type 2 Active Galactic Nuclei
• Measuring the Virial Factor in SDSS DR5 Quasars with Redshifted H$\beta$ and Fe ii Broad Emission Lines

Cited by in corpus (3)

• The rise and fall of the iron-strong nuclear transient PS16dtm
• A candidate of binary black hole system in AGN with broad Balmer emission lines having quite different line widths
• Measuring the Virial Factor in SDSS DR7 AGNs with Redshifted H$\beta$ and H$\alpha$ Broad Emission Lines