Hostname: page-component-586b7cd67f-r5fsc Total loading time: 0 Render date: 2024-11-30T00:36:25.206Z Has data issue: false hasContentIssue false
  • English
  • Français

Megamaser Activity in Active Galaxies

Published online by Cambridge University Press:  25 May 2016

Willem A. Baan
Willem A. Baan*
Affiliation:
Netherlands Foundation for Research in Astronomy Westerbork Observatory, 7990 AA Dwingeloo, The Netherlands

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.

Megamaser emission provides an unprecedented view of the inner nuclear regions of active galaxies. The characteristics of OH, H2CO, and H2O sources identify different physical environments in the nuclei of megamaser host galaxies. Various classification schemes suggest a dominant starburst nature for the OH and H2CO sources providing the NIR/FIR radiation field as a pump. The molecular emission originates in a 50–100 parsec disk/torus, which is not yet completely observed. For H2O masers in relatively dust-free LINER/Seyfert 2 sources, the AGN provides the X-ray radiation field for pumping in a compact sub-parsec thin disk.

Type
I. Observational Properties of AGN
Information
Symposium - International Astronomical Union , Volume 194: Activity in Galaxies and Related Phenomena , 1999 , pp. 46 - 53
Copyright
Copyright © Astronomical Society of the Pacific 1999 

References

Baan, W.A. 1985, Nature, 315, 26 Google Scholar
Baan, W.A. 1989, Ap.J., 338, 804 Google Scholar
Baan, W.A. 1991, in Skylines, Third Haystack Observatory Conference, Haschick, A.D. and Ho, P.T., P.A.S.P. Conf. Series, 16, 45 Google Scholar
Baan, W.A. 1997, in High Sensitivity Radio Astronomy, Davis, R. J. & Jackson, N. J., Cambridge University, 73 Google Scholar
Baan, W.A. & Haschick, A.D. 1987, Ap.J., 318, 139 Google Scholar
Baan, W.A. & Haschick, A.D. 1995, Ap.J., 454, 745 Google Scholar
Baan, W.A., Haschick, A.D. & Uglesich, R. 1993, Ap.J., 415, 140 Google Scholar
Baan, W.A., Henkel, C. & Haschick, A.D. 1987, Ap.J., 320, 154 Google Scholar
Baan, W.A. et al. 1992, Ap.J., 396, L99 Google Scholar
Baan, W.A., Kloeckner, H.-R., Haschick, A.D., & Besenfelder, E. 1999, Ap.J., submitted Google Scholar
Baan, W.A., Salzer, J.J., & LeWinter, R.D. 1998, Ap.J., December 15 Google Scholar
Baan, W.A., Wood, P.A.D. & Haschick, A.D. 1982, Ap.J., 260, L49 Google Scholar
Braatz, J., Wilson, A.S., & Henkel, C. 1997, Ap.J. Suppl., 110, 321 Google Scholar
Briggs, F.H. 1998, Astron. Ap.,Google Scholar
Condon, J.J., Huang, Z.-P., Yin, Q.F., & Thuan, T.X. 1991, Ap.J., 378, 65 Google Scholar
Diamond, P., Norris, R. Baan, W.A., & Booth, R. 1990, Ap.J., 340, L49 Google Scholar
Gallimore, J., et al. 1998, Ap.J., 462, 740 Google Scholar
Genzel, R. et al. 1998, Ap.J., 498, 579 Google Scholar
Haschick, A.D., Baan, W.A., & Peng, E. 1994, Ap.J., 437, L35 Google Scholar
Heckman, T.M., Armus, L., & Miley, G.K. 1990, Ap.J. Suppl., 74, 833 Google Scholar
Henkel, C., Baan, W.A., & Mauersberger, R. 1993, Astron. Ap. Rev., 3, 47 Google Scholar
Henkel, C., Güsten, R. & Baan, W.A. 1987, Astron. Ap., 185, 14 Google Scholar
Helou, G., Soifer, B.T., & Row, R.M. 1985, Ap.J., 298, L11 Google Scholar
Kylafis, N.D. & Pavlakis, K.G. 1998, IAU Highlights of Astronomy, 23, in press Google Scholar
Lonsdale, C.J., Lonsdale, C.J., Diamond, P.J., & Smith, H.E. 1998, Ap.J., 493, L13 CrossRefGoogle Scholar
Montgomery, A.S. & Cohen, R.J. 1992, M.N.R.A.S., 254, 23p Google Scholar
Myoshi, M. et al. 1995, Nature, 373, 127 Google Scholar
Neufeld, D., Maloney, P., & Conger, S. 1994, Ap.J., 436, L127 Google Scholar
Scoville, N.Z., Yun, M. & Bryant, P. 1997, Ap.J., 484, 702 CrossRefGoogle Scholar
Scoville, N.Z. et al. 1998, Ap.J., 492, L107 CrossRefGoogle Scholar
Smith, H.A., Lonsdale, C.J., Lonsdale, C.J., & Diamond, P.J. 1998, Ap.J., 493, L17 Google Scholar
Trotter, A.S. et al. 1997, Ap.J., 485, L79 Google Scholar