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The Influence of Cosmic Rays in the Circumnuclear Molecular Gas of NGC 1068

  • Rebeca Aladro
  • Serena Viti
  • Estelle Bayet
  • Denise Riquelme
Conference paper
Part of the Astrophysics and Space Science Proceedings book series (ASSSP, volume 34)

Abstract

We surveyed the circumnuclear disk of the Seyfert galaxy NGC 1068 between the frequencies 86.2 and 115.6 GHz, and identified 17 different molecules. Using a time and depth dependent chemical model we reproduced the observational results, and show that the column densities of most of the species are better reproduced if the cold gas is heavily pervaded by a high cosmic ray ionization rate of about 1,000 times that of the Milky Way. We discuss how molecules in the NGC 1068 nucleus may be influenced by this external radiation, as well as by UV radiation fields.

Keywords

Active Galactic Nucleus Column Density Local Thermodynamic Equilibrium Visual Extinction Local Thermodynamic Equilibrium Condition 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. 1.
    Aladro, R., Martín, S., Martín-Pintado, J., et al. 2011, A&A 535, A84ADSCrossRefGoogle Scholar
  2. 2.
    Aladro, R., Viti, S., Bayet, E., et al. 2012, submitted to A&A.Google Scholar
  3. 3.
    Bayet, E., Viti, S., Williams, D. A., et al. 2008, ApJ 676, 978ADSCrossRefGoogle Scholar
  4. 4.
    Bayet, E., Viti, S., Williams, D. A., et al. 2009, ApJ 696, 1466ADSCrossRefGoogle Scholar
  5. 5.
    Bayet, E., Aladro, R., Martín, S., et al. 2009, ApJ 707, 126ADSCrossRefGoogle Scholar
  6. 6.
    Bland-Hawthorn, J., Gallimore, J. F., Tacconi, L. J., et al.& Cecil, G. N. 1997, Astrophys. & Space Sci. 248, 9Google Scholar
  7. 7.
    Costagliola, F., Aalto, S., Rodriguez, M. I., et al. 2011, A&A 528, A30ADSCrossRefGoogle Scholar
  8. 8.
    Dalgarno, A. 2006, Proc. of the Natl. Acad. of Sci. 103, 12269Google Scholar
  9. 9.
    García-Burillo, S., Usero, A., Fuente, A., et al. 2010, A&A 519, A2ADSCrossRefGoogle Scholar
  10. 10.
    Habing, H. J. 1968, Bull. Astron. Inst. Neth. 19, 421ADSGoogle Scholar
  11. 11.
    Helfer, T. T., & Blitz, L. 1995, ApJ 450, 90ADSCrossRefGoogle Scholar
  12. 12.
    Kamenetzky, J., Glenn, J., Maloney, P. R., et al. 2011, ApJ 731, 83ADSCrossRefGoogle Scholar
  13. 13.
    Krips, M., Neri, R., García-Burillo, S., et al. 2008, ApJ 677, 262ADSCrossRefGoogle Scholar
  14. 14.
    Le Teuff, Y. H., Millar, T. J., & Markwick, A. J. 2000, Astron. & Astrophys. Ser., 146, 157ADSCrossRefGoogle Scholar
  15. 15.
    Martín, S., Mauersberger, R., Martín-Pintado, J., Henkel, C., & García-Burillo, S. 2006, Astrophys. J. Supl. Ser. 164, 450ADSCrossRefGoogle Scholar
  16. 16.
    Millar, T. J., MacDonald, G. H., & Gibb, A. G. 1997, A&A 325, 1163ADSGoogle Scholar
  17. 17.
    Nakajima, T., Takano, S., Kohno, K., et al. 2011, ApJ Lett. 728, L38ADSCrossRefGoogle Scholar
  18. 18.
    Schinnerer, E., Eckart, A., Tacconi, L. J., et al. 2000, ApJ 533, 850ADSCrossRefGoogle Scholar
  19. 19.
    Tacconi, L. J., Genzel, R., Blietz, M., et al. 1994, ApJ Lett. 426, L77ADSCrossRefGoogle Scholar
  20. 20.
    Telesco, C. M., & Harper, D. A. 1980, ApJ 235, 392ADSCrossRefGoogle Scholar
  21. 21.
    Usero, A., García-Burillo, S., Fuente, A., et al. 2004, A&A 419, 897ADSCrossRefGoogle Scholar
  22. 22.
    Viti, S., & Williams, D. A. 1999, MNRAS 305, 755ADSCrossRefGoogle Scholar
  23. 23.
    Viti, S., Collings, M. P., Dever, J. W., et al. 2004, Mon. Not. R. Astron. Soc. 354, 1141ADSCrossRefGoogle Scholar
  24. 24.
    Woodall, J., Agúndez, M., Markwick-Kemper, A. J., et al. 2007, A&A 466, 1197ADSCrossRefGoogle Scholar
  25. 25.
    Zaritsky, D., Kennicutt, R. C., Jr., & Huchra, J. P. 1994, ApJ 420, 87ADSCrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Rebeca Aladro
    • 1
  • Serena Viti
    • 1
  • Estelle Bayet
    • 2
  • Denise Riquelme
    • 3
  1. 1.Department of Physics and AstronomyUCLLondonUK
  2. 2.Sub-Department of AstrophysicsUniversity of OxfordOxfordUK
  3. 3.Instituto de Radioastronomía MilimétricaGranadaSpain

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