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http://dx.doi.org/10.5303/JKAS.2020.53.5.103

SPATIALLY RESOLVED KINEMATICS OF GAS AND STARS IN HIDDEN TYPE 1 AGNS  

Son, Donghoon (Astronomy Program, Department of Physics and Astronomy, Seoul National University)
Woo, Jong-Hak (Astronomy Program, Department of Physics and Astronomy, Seoul National University)
Eun, Da-In (Astronomy Program, Department of Physics and Astronomy, Seoul National University)
Cho, Hojin (Astronomy Program, Department of Physics and Astronomy, Seoul National University)
Karouzos, Marios (Nature Astronomy, Springer Nature)
Park, Songyeon (Astronomy Program, Department of Physics and Astronomy, Seoul National University)
Publication Information
Journal of The Korean Astronomical Society / v.53, no.5, 2020 , pp. 103-115 More about this Journal
Abstract
We analyze the spatially resolved kinematics of gas and stars for a sample of ten hidden type 1 AGNs in order to investigate the nature of their central sources and the scaling relation with host galaxy stellar velocity dispersion. We select our sample from a large number of hidden type 1 AGNs, which are identified based on the presence of a broad (full width at half maximum ≳1000 km s-1) component in the Hα line profile and which are frequently mis-classified as type 2 AGNs because AGN continuum and broad emission lines are weak or obscured in the optical spectral range. We used the Blue Channel Spectrograph at the 6.5-m Multiple Mirror Telescope to obtain long-slit data with a spatial scale of 0.3 arcsec pixel-1. We detected broad Hβ lines for only two targets; however, the presence of strong broad Hα lines indicates that the AGNs we selected are all low-luminosity type 1 AGNs. We measured the velocity, velocity dispersion, and flux of stellar continuum and gas emission lines (i.e., Hβ and [O III]) as a function of distance from the center. The spatially resolved gas kinematics traced by Hβ or [O III] are generally similar to the stellar kinematics except for the inner center, where signatures of gas outflows are detected. We compare the luminosity-weighted effective stellar velocity dispersions with the black hole masses and find that our hidden type 1 AGNs, which have relatively low back hole masses, follow the same scaling relation as reverberation-mapped type 1 AGN and more massive inactive galaxies.
Keywords
galaxies: active; galaxies: kinematics and dynamics; quasars: emission lines;
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