A systematic search for hidden type 1 AGNs: gas kinematics and scaling relations

Abstract

We search type 1 AGNs among emission-line galaxies, that are typically classified as type 2 AGNs based on emission line flux ratios if a broad component in the H$\alpha$ line profile is not properly investigated. Using ~24,000 type 2 AGNs at z $<$0.1 initially selected from Sloan Digital Sky Survey Data Release 7 by Bae, et al. 2014, we identify a sample of 611 type 1 AGNs based on the spectral fitting results and visual inspection. These hidden type 1 AGNs have relatively low luminosity with a mean broad \Ha\ luminosity, log L${}_{\mathrm{H}\alpha }$ $=$ 40.73$\pm$0.32 \ergs\, and low Eddington ratio with a mean log L${}_{bol}$/L${}_{\mathrm{Edd}}$ $=$ -2.04$\pm$0.34, while they do follow the black hole mass - stellar velocity dispersion relation defined by the inactive galaxies and the reverberation-mapped type 1 AGNs. We investigate ionized gas outflows based on the [OIII] $\lambda$5007 kinematics, which show relatively high velocity dispersion and velocity shift, indicating that the line-of-sight velocity and velocity dispersion of the ionized gas in type 1 AGNs is on average larger than that of type 2 AGNs.

ApJ submitted, revised based on referee's comments, 12 pages, 12 figures

References in corpus (16)

• The Host Galaxies and Classification of Active Galactic Nuclei
• Galaxy Zoo 1 : Data Release of Morphological Classifications for nearly 900,000 galaxies
• The black hole mass - stellar velocity dispersion relation of narrow-line Seyfert 1 galaxies
• On the nature of Seyfert galaxies with high [OIII]5007 blueshifts
• Cosmic Evolution of Black Holes and Spheroids. I: The M_BH-sigma Relation at z=0.36
• The FIRST-2MASS Red Quasar Survey
• A New Catalogue of Type 1 AGN and its Implication on the AGN Unified Model
• Narrow-line Seyfert 1 Galaxies and the M_BH - sigma Relation
• Multi-epoch Spectroscopy of Dwarf Galaxies with AGN Signatures: Identifying Sources with Persistent Broad H-alpha Emission
• The Prevalence of Gas Outflows in Type 2 AGNs. II. 3D Biconical Outflow Models
• Delayed or no feedback? - Gas outflows in Type 2 AGNs. III
• A Census of Gas Outflows in Type 2 Active Galactic Nuclei
• Cosmic Evolution of Black Holes and Spheroids. V. The Relation Between Black Hole Mass and Host Galaxy Luminosity for a Sample of 79 Active Galaxies
• The AKARI 2.5-5.0 Micron Spectral Atlas of Type-1 Active Galactic Nuclei: Black Hole Mass Estimator, Line Ratio, and Hot Dust Temperature
• Relativistic redshifts in quasar broad lines
• Misclassified type 1 AGNs in the local universe

Cited by in corpus (13)

• Black Hole Mergers From Globular Clusters Observable by LISA I: Eccentric Sources Originating From Relativistic $N$-body Dynamics
• A census of ionized gas outflows in type 1 AGNs: gas outflows in AGNs. V
• LLAMA: The $M_{BH}$ - ${\sigma }_{\star }$ Relation of the most luminous local AGNs
• Unravelling the complex structure of AGN-driven outflows III. The outflow size-luminosity relation
• A Uniformly Selected, All-Sky, Optical AGN Catalog
• The correlation of outflow kinematics with star formation rate -- Gas outflows in AGNs. VI
• Tracing the outflow kinematics in Type 2 Active Galactic Nuclei
• Outflow kinematics manifested by the H-alpha line: gas outflows in Type 2 AGNs. IV
• A Uniformly Selected, Southern-Sky 6dF, Optical AGN Catalog
• [OIII] 5007A Emission Line Width as a Surrogate for stellar dispersion in Type 1 AGNs?
• Spatially Resolved Spectroscopic Study of nearby Seyfert Galaxies: Implications for a Population of "Missed" Seyferts at High-$\text{z}$
• Active galactic nuclei and gravitational redshifts
• Search of Intermediate Mass Black Holes at Low Redshift with Intra-night Variability