Poster Presentation
Obscuring Fraction of Active Galactic Nuclei Implied by Supernova and Radiative Feedbacks
Presenter: Nozomu Kawakatsu (National Institute of Technology, Kure College)
We study the obscuring structure of circumnuclear disks (CNDs) by considering supernova (SN) feedbacks from nuclear starburst and the effect of anisotropic radiative pressure from active galactic nuclei (AGNs). We suppose that the mass accretion onto a central supermassive black hole (SMBH) is triggered by SN-driven turbulence within CNDs, and we explore how the structures of CNDs depend on the BH mass (M_BH) and AGN luminosity (L_AGN). We find that the obscuring fraction (fobs) peaks at ∼10% of the Eddington luminosity (L_Edd), and its maximal value is fobs ∼ 0.6 for less massive SMBHs (e.g., MBH < 10^8 M_sun). This is because the scale height of CNDs is determined by the SN-driven accretion for a smaller LAGN, while the dusty molecular gas in CNDs is blown away by the radiation pressure from AGNs beyond the critical luminosity. On the other hand, for massive SMBHs (e.g., MBH > 10^8 M_sun), fobs is always smaller than 0.2, and it is almost independent of L_AGN because the scale height of CNDs is mainly controlled by the maximal star formation efficiency ( C∗,max ) in CNDs. We will compare our predictions with the mid-infrared and X-ray observations.
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