Penetrating Dust Tori in AGN

  • Gabriela Canalizo
  • Claire Max
  • Robert Antonucci
  • David Whysong
  • Alan Stockton
  • Mark Lacy
Part of the Astrophysics and Space Science Library book series (ASSL, volume 319)

Abstract

We present preliminary results from high resolution ~ 0.05”) adaptive optics observations of Cygnus A. The images show a biconical structure strongly suggestive of an obscuring torus around a quasar nucleus. A bright (K’ = 18.5) point source is found near the expected position of the nucleus. We interpret this source as the hot inner rim of the torus seen through the opening of the torus. Using high angular resolution K-band spectroscopy, we measure the ratio of molecular to recombination hydrogen lines as a function of distance to the center of the putative torus. These measurements place constraints on the properties of the torus and indicate a projected diameter of ~ 600 pc.

Keywords

Active galaxies infrared galaxies adaptive optics 

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References

  1. Canalizo, G., Max, C. E., Whysong, D., Antonucci, R., Dahm, S. E. 2003, ApJ, 597, 823ADSCrossRefGoogle Scholar
  2. Carilli, C. L., & Barthel, P. D. 1996, A&A Rev., 7, 1Google Scholar
  3. de Koff, S. 2000, ApJ, 129, 33CrossRefGoogle Scholar
  4. Imanishi, M., Ueno, S. 2000, ApJ, 535, 626ADSCrossRefGoogle Scholar
  5. Ogle, P., Cohen, M., Miller, J. S., Tran, H. D., Fosbury, R. A. E., Goodrich, R. W. 1997, ApJ, 482, L37ADSCrossRefGoogle Scholar
  6. Tadhunter, C. N., Packham, C., Axon, D. J., Jackson, N. J., Hough, J. H., Robinson, A., Young, S., Sparks, W. 1999, ApJ, 512, 91ADSCrossRefGoogle Scholar
  7. Tadhunter, C. N., Sparks, W., Axon, D. J., Bergeron, L., Jackson, N. J., Packham, C., Hough, J. H., Robinson, A., Young, S. 2000, MNRAS, 313, 52ADSCrossRefGoogle Scholar
  8. Ueno, S., Koyama, K., Nishida, M., Yamauchi, S., Ward, M.J. 1994, ApJL, 431, 1CrossRefGoogle Scholar
  9. Vestergaard, M., Barthel,P.D. 1993, AJ, 105, 456ADSCrossRefGoogle Scholar
  10. Ward, M. J., Blanco, P. R., Wilson, A. S., Nishida, M. 1991, ApJ, 382, 115ADSCrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 2004

Authors and Affiliations

  • Gabriela Canalizo
    • 1
  • Claire Max
    • 2
    • 3
  • Robert Antonucci
    • 4
  • David Whysong
    • 4
  • Alan Stockton
    • 5
  • Mark Lacy
    • 6
  1. 1.Department of Earth Sciences and IGPPUniversity of CaliforniaRiversideUSA
  2. 2.Lawrence Livermore National LaboratoryIGPPUSA
  3. 3.Center for Adaptive OpticsUniversity of CaliforniaSanta CruzUSA
  4. 4.Physics DepartmentUniversity of CaliforniaSanta BarbaraUSA
  5. 5.Institute for AstronomyUniversity of HawaiiUSA
  6. 6.Spitzer Science Center, MS 220-6CaltechUSA

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