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Dusty Torus Formation by Anisotropic Radiative Pressure Feedback of Active Galactic Nuclei

Dusty Torus Formation by Anisotropic Radiative Pressure Feedback of Active Galactic Nuclei. Shuang-Nan Zhang Institute of High Energy Physics and National Astronomical Observatories of China Chinese Academy of Sciences. Liu,Y. & Zhang, S.N., 2011, ApJL, 728, L44. The unified model of AGN.

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Dusty Torus Formation by Anisotropic Radiative Pressure Feedback of Active Galactic Nuclei

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  1. Dusty Torus Formation by Anisotropic Radiative Pressure Feedback of Active Galactic Nuclei Shuang-Nan Zhang Institute of High Energy Physics and National Astronomical Observatories of China Chinese Academy of Sciences Liu,Y. & Zhang, S.N., 2011, ApJL, 728, L44

  2. The unified model of AGN Formation？ Dusty torus Evolution？

  3. AGN feedback The normal of the accretion disk • The distribution of the dust is anisotropic • The UV/optical radiation from the accretion disk is also anisotropic • The effect of radiation pressure is significant due to the presence of dust observer A~500

  4. The evolution of AGNs A B C Momentum effect of radiation

  5. Evaporation radius The inner radius of dust Energy effect of radiation

  6. The profile of a dusty torus

  7. NH-L/LEdd plane Raimundo, Fabian, Bauer et al. 2010

  8. The fraction of type 2 AGNs Hasinger 2008

  9. The inner radius of dust Suganuma et al. 2006

  10. The evolution of dusty torus Bright, with torus, but without BLR

  11. Weak line quasars Shemmer et al. 2009; EW<5 A; continuum similar to normal quasars

  12. Evidence of hot dust in WLQ Black body from hot dust Diamond-Stanic et al. 2009

  13. Radio quiet BL Lac Plotkin et al. 2009 No obvious emission lines

  14. Variability • Observations are quite limited • Weaker than radio loud BL Lac？ • Need more observations Plotkin et al. 2010

  15. Conclusions • The distribution of dusty gas should also be anisotropic due to the influence of the anisotropic disk radiation • This model can explain the presence of some obscured AGNs with high Eddington ratios and can also quantitatively reproduce the observed decreasing fractionof type 2 AGNs with increasing luminosity. • Our model predicts the existence of bright AGNswith dusty tori, but without broad line regions. • Weak line quasars and radio quite BL Lac Objects? Liu,Y. & Zhang, S.N., 2011, ApJL, 728, L44

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