Journal of The Korean Astronomical Society (천문학회지)

The Korean Astronomical Society (한국천문학회)
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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)
  • Received : 2020.08.03
  • Accepted : 2020.09.24
  • Published : 2020.10.31
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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.

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References

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