The Bulletin of The Korean Astronomical Society (천문학회보)

The Korean Astronomical Society (한국천문학회)
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Relation between Black Hole Mass and Bulge in Hard X-ray selected Type 1 AGNs

  • Son, Suyeon (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) ;
  • Kim, Minjin (Department of Astronomy and Atmospheric Sciences, Kyungpook National University) ;
  • Barth, Aaron J. (Department of Physics and Astronomy, University of California at Irvine) ;
  • Ho, Luis C. (Kavli Institute for Astronomy and Astrophysics)
  • Published : 2020.10.13
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Abstract

We present a scaling relation between black hole (BH) mass and bulge luminosity for 35 nearby (z<0.1) type 1 active galaxies, selected from the 70-month Swift-BAT X-ray source catalog. Thanks to the unbiased selection and proximity of the parent sample, our sample is suitable to study the physical connection between central black holes and host galaxies. We use the F814W images obtained with the Advanced Camera for Surveys on Hubble Space Telescope, to perform the imaging decomposition with GALFIT. With a careful treatment on the PSF model, we measure the I-band bulge brightness robustly. In combination with the BH mass estimated from a single-epoch spectroscopic data, we present the correlation between BH mass and bulge luminosity of the target AGNs. We demonstrate that our sample marginally lies off from the M(BH)-L(bulge) relation of inactive galaxies. We discuss possible physical origins of this discrepancy. Finally, we present how the relation depends on the photometric properties of AGNs and host galaxies, which may provide an useful insight on the co-evolution between BHs and host galaxies.

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