科研之友
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摘要
We search type 1 active galactic nuclei (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 Ha line profile is not properly investigated. Using similar to 24,000 type 2 AGNs at z < 0.1, initially selected from Sloan Digital Sky Survey Data Release 7 by Bae & Woo, 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-H alpha = 40.73. 0.32 erg s(-1) and low Eddington ratio with a mean log L-bol/L-Edd = -2.04. +/- 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 [O III] 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.
- 出版日期2017-6-10
