Hostname: page-component-8448b6f56d-c47g7 Total loading time: 0 Render date: 2024-04-19T04:18:10.107Z Has data issue: false hasContentIssue false
  • English
  • Français

Warped discs and the Unified Scheme

Published online by Cambridge University Press:  01 August 2006

Andrew Lawrence
Andrew Lawrence*
Affiliation:
Institute for Astronomy, University of Edinburgh Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK email: al@roe.ac.uk
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The standard torus picture for explaining the difference between Type I and Type II AGN is physically unlikely and provides no natural explanation for a number of simple facts - the average covering factor, the broad range of covering factors, and the characteristic reprocessing distance. Parsec scale warped discs are a strong alternative. A very simple “misaligned disc” model produces good agreement with covering factor statistics, but predicts too many off-axis emission line cones. I discuss possible ways to improve such a model.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S238: Black Holes from Stars to Galaxies – Across the Range of Masses , August 2006 , pp. 117 - 122
Copyright
Copyright © International Astronomical Union 2007

References

Antonucci, R. R. J. & Miller, A. S. 1985, ApJ, 297, 621CrossRefGoogle Scholar
Clarke, C. J., Kinney, A. L. & Pringle, J. E. 1998, ApJ, 495, 189CrossRefGoogle Scholar
Elvis, M., Wilkes, B. J., McDowell, J. C.Green, R. F.Bechtold, J.Willner, S. P. et al. 1994, ApJSS, 95, 1CrossRefGoogle Scholar
Grimes, J. A., Rawlings, S. & Willott, C. J. 2004, MNRAS, 349, 503CrossRefGoogle Scholar
Hunt, L. K. & Malkan, M. A. 2004, ApJ, 616, 707CrossRefGoogle Scholar
Jackson, N. & Browne, I. W. A. 1990, Nature, 343, 43CrossRefGoogle Scholar
Kinney, A. L., Schmitt, H. R., Clarke, C. J., Pringle, J. E., Ulvestad, J. S. & Antonucci, R. R. J. 2000, ApJ, 537, 152CrossRefGoogle Scholar
Krolik, J. H. & Begelman, M. C. 1988, ApJ, 329, 702CrossRefGoogle Scholar
Lawrence, A. 1991, MNRAS, 252, 586CrossRefGoogle Scholar
Lacy, M., Storrie-Lombardi, L. J.Sajina, A. et al. 2004, ApJ, 154, 166Google Scholar
Malkan, M. A.Gorjian, V. & Tam, R. 1998, ApJSS, 117, 25CrossRefGoogle Scholar
Martinez-Sansigre, A.Rawlings, S.Lacy, M.Fadda, D.Marline, F. R.Simpson, C. et al. 2005, Nature, 436, 666CrossRefGoogle Scholar
Nagar, N. M. & Wilson, A. 1999, ApJ, 516, 97CrossRefGoogle Scholar
Phinney, E. S. 1989, in Theory of Accretion Disks, p. 457, eds Meyer, F. et al. (Dordrecht: Kluwer)CrossRefGoogle Scholar
Pringle, J. E. 1996, MNRAS, 281, 357CrossRefGoogle Scholar
Pringle, J. E. 1997, MNRAS, 292, 136CrossRefGoogle Scholar
Rush, B., Malkan, M. A. & Spinoglio, L. 1993, ApJSupp 89, 1CrossRefGoogle Scholar
Sanders, D. B., Phinney, E. S., Neugebauer, G., Soifer, B. T. & Mathews, K. 1989, ApJ, 347, 29CrossRefGoogle Scholar
Schmitt, H. R., Pringle, J. E., Clarke, C. J. & Kinney, A. L. 2002, ApJ, 575, 150CrossRefGoogle Scholar
Schmitt, H. R., Donley, J. L., Antonucci, R. R. J., Hutchings, J. B. & Kinney, A. L. 2003, ApJSS, 148, 327CrossRefGoogle Scholar
Simpson, C. 2005, MNRAS, 360, 565CrossRefGoogle Scholar
Tohline, J. E. & Osterbrock, D. E. 1982, ApJ, 252, L49CrossRefGoogle Scholar
Ulvestad, J. S. & Wilson, A. S. 1984, ApJ, 285, 439CrossRefGoogle Scholar
Ueda, Y., Akiyama, M., Ohta, K. & Miyaji, T. 2003, ApJ, 598, 886CrossRefGoogle Scholar
Whittle, M. 1985, MNRAS, 213, 33CrossRefGoogle Scholar
Willott, C. J., Rawlings, S., Blundell, K. & Lacy, M. 2000, MNRAS, 316, 449CrossRefGoogle Scholar