Hostname: page-component-7c8c6479df-8mjnm Total loading time: 0 Render date: 2024-03-28T10:33:24.769Z Has data issue: false hasContentIssue false

Masers in AGN environments

Published online by Cambridge University Press:  01 March 2007

L. J. Greenhill*
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden St, Cambridge, MA 02138 USA email: greenhill@cfa.harvard.edu
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.

Galactic nuclei are well known sources of OH and H2O maser emission. It appears that intense star formation in ultra-luminous infrared galaxies drives most OH sources. In contrast, nuclear activity appears to drive most H2O sources. When H2O emission originates in accretion disk structures, constrained geometry and dynamics enable robust interpretation of spectroscopic and imaging data. The principal science includes study of AGN geometry at parsec and sub-parsec radii and measurement of geometric distances in the Hubble Flow. New high accuracy estimates of the “Hubble constant, H○” obtained from maser distances may enable new substantively improved constraints on fundamental cosmological parameters (e.g., dark energy).

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

References

Argon, A. L., Greenhill, L., Reid, M., Moran, J., & Humphreys, E. 2007, ApJ 659, 1040CrossRefGoogle Scholar
Baan, W. A. & Klöckner, H.-R. 2006, A&A 449, 559Google Scholar
Barvainis, R. & Antonucci, R. R. J. 2005, ApJ 628, 89CrossRefGoogle Scholar
Braatz, J. A., Wilson, A. S., & Henkel, C. 1996, ApJS 106, 51CrossRefGoogle Scholar
Braatz, J. A., Henkel, C., Greenhill, L. J., Moran, J. M., & Wilson, A. S. 2004, ApJ 617, L29CrossRefGoogle Scholar
Churchwell, E., Witzel, A., Pauliny-Toth, I., Sieber, W., Huchtmeier, W., Roland, J., 1977, A&A 54, 969Google Scholar
Claussen, M. J., Heiligman, G. M., & Lo, K.-Y. 1984, Nature 310, 298CrossRefGoogle Scholar
Claussen, M. J. & Lo, K.-Y. 1986, ApJ 308, 592CrossRefGoogle Scholar
Claussen, M. J., Reid, M. J., Schneps, M. H., Lo, K.-Y., Moran, J. M., & Güsten, R., 1988, in: Reid, M. J. & Moran, J. M. (eds.), The Impact of VLBI on Astrophysics and Geophysics, Proceedings of the 129th IAU Symposium (Dordrecht: Kluwer) vol. 129, p. 231CrossRefGoogle Scholar
Claussen, M. J., Diamond, P. J., Braatz, J. A., Wilson, A. S., Henkel, C. 1998, ApJ 500, L129CrossRefGoogle Scholar
Dos Santos, P. M. & Lépine, J. R. D. 1979, Nature 278, 34CrossRefGoogle Scholar
Ferrarese, L., et al. 2006, ApJ 644, L21CrossRefGoogle Scholar
Ferrarese, L. & Merritt, D. 2000, ApJ 539, L9CrossRefGoogle Scholar
Fruscione, A., Greenhill, L. J., Filippenko, A. V., Moran, J. M., Herrnstein, J. R., Galle, E., 2005, ApJ 624, 103CrossRefGoogle Scholar
Gallimore, J. F., Baum, S. A., O'Dea, C. P., Brinks, E., Pedlar, A., 1996, ApJ 462, 740CrossRefGoogle Scholar
Gallimore, J. F., Baum, S. A. & O'Dea, C. P. 2004, ApJ 613, 794CrossRefGoogle Scholar
García-Burillo, S., Combes, F., Usero, A., Graciá-Carpio, J. 2007, New Astron. 51, 160CrossRefGoogle Scholar
Gardner, F. F. & Whiteoak, J. B 1982, MNRAS 201, P13CrossRefGoogle Scholar
Greenhill, L. J., Jiang, D., Moran, J., Reid, M., Lo, K.-Y., Claussen, M., 1995, ApJ 440, 619CrossRefGoogle Scholar
Greenhill, L. J. & Gwinn, C. R. 1997, Ap&SS 248, 261Google Scholar
Greenhill, L. J. 2002a, in: Migenes, V. and Reid, M. J. (eds.), Cosmic Masers: from Proto-Stars to Black Holes, Proceedings of IAU Symposium 206, (San Francisco: ASP) vol. 206, p. 381CrossRefGoogle Scholar
Greenhill, L. J., et al. 2002b, ApJ 565, 836CrossRefGoogle Scholar
Greenhill, L. J., et al. 2003a, ApJ 590, 162CrossRefGoogle Scholar
Greenhill, L. J., Kondratko, P. T., Lovell, J. E. J., Kuiper, T. B. H., Moran, J. M., Jauncey, D. L., Baines, G. A., 2003b, ApJ 582, L11CrossRefGoogle Scholar
Greenhill, L. J. 2004, New Astron. 48, 1079CrossRefGoogle Scholar
Hagiwara, Y. 2007 AJ 133, 1176CrossRefGoogle Scholar
Henkel, C., Güsten, R., Downes, D., Thum, C., Wilson, T., Biermann, P., 1984, A&A 141, L1Google Scholar
Henkel, C., Whiteoak, J. B., Nyman, L.-A., Harju, J., 1990, A&A 230, L5Google Scholar
Henkel, C., Peck, A. B., Tarchi, A., Nagar, N. M., Braatz, J. A., Castangia, P., Moscadelli, L. 2005, A&A 436, 75Google Scholar
Herrnstein, J. R., et al. 1999, Nature 400, 539CrossRefGoogle Scholar
Herrnstein, J. R., Moran, J. M., Greenhill, L. J., & Trotter, A. S. 2005, ApJ 629, 719CrossRefGoogle Scholar
Ho, P. T. P., Martin, R. N., Henkel, C., Turner, J. L., 1987, ApJ 320, 663CrossRefGoogle Scholar
Hu, W. 2005, in: Wolff, S. and Lauer, T. (eds.) Observing Dark Energy (San Francisco: ASP) vol. 339, p. 215Google Scholar
Humphreys, E. M. L., et al. 2005, ApJ 634, L133CrossRefGoogle Scholar
Ishihara, Y., Nakai, N., Iyomoto, N., Makishima, K., Diamond, P., Hall, P., 2001, PASJ 53, 215CrossRefGoogle Scholar
Klöckner, H.-R. & Baan, W. A. 2005, Ap&SS 295, 277Google Scholar
Kondratko, P. T., Greenhill, L. J. & Moran, J. M., 2004, ApJ 618, 618CrossRefGoogle Scholar
Kondratko, P. T., et al. 2006a, ApJ 638, 100CrossRefGoogle Scholar
Kondratko, P. T., Greenhill, L. J., & Moran, J. M. 2006b, ApJ 652, 136CrossRefGoogle Scholar
Kondratko, P. T., Greenhill, L. J., & Moran, J. M. 2007, ApJ submittedGoogle Scholar
Lépine, J. R. D. & Dos Santos, P. M., 1977, Nature 270, 501CrossRefGoogle Scholar
Lodato, G. & Bertin, G. 2003, A&A 398, 517Google Scholar
Macri, L., Stanek, K., Bersier, D., Greenhill, L., & Reid, M., 2006, ApJ 652, 1133CrossRefGoogle Scholar
Madejski, G., Done, C., Życki, P. T., & Greenhill, L. 2006, ApJ, 636, 75CrossRefGoogle Scholar
Maloney, P. R., Begelman, M. C. & Pringle, J. E. 1996, ApJ 472, 582CrossRefGoogle Scholar
Miyoshi, M., Moran, J., Herrnstein, J., Greenhill, L., Nakai, N., Diamond, P., & Inoue, M. 1995, Nature 373, 127CrossRefGoogle Scholar
Momjian, E., Romney, J. D., Carilli, C. L., Troland, T. H. 2006, ApJ 653, 1172CrossRefGoogle Scholar
Morganti, R., Greenhill, L. J., Peck, A. B., Jones, D. L., Henkel, C. 2004, New Astron. 48, 1195CrossRefGoogle Scholar
Nakai, N., Inoue, M. & Miyoshi, M. 1993, Nature 361, 45CrossRefGoogle Scholar
Nakai, N., Inoue, M., Miyazawa, K., Miyoshi, M., Hall, P. 1995, PASJ 47, 771Google Scholar
Peck, A. B., Henkel, C., Ulvestad, J. S., Brunthaler, A., Falcke, H., Elitzur, M., Menten, K. M., Gallimore, J. F., 2003, ApJ 590, 149CrossRefGoogle Scholar
Pihlström, Y. M., Conway, J., Booth, R., Diamond, P., Polatidis, A. 2001, A&A 377, 413Google Scholar
Pihlström, Y. M., Baan, W. A., Darling, J., Klöckner, H.-R. 2005a, ApJ 618, 705CrossRefGoogle Scholar
Pihlström, Y. M. 2005b, in: Romney, J. & Reid, M. (eds.), Future Directions in High Resolution Astronomy, (San Francisco: ASP) vol. 340, p. 224Google Scholar
Reid, M. J. & Brunthaler, A. 2004, ApJ 616, 872CrossRefGoogle Scholar
Richards, A. M. S., et al. 2005, MNRAS 364, 353CrossRefGoogle Scholar
Rovilos, E., Diamond, P., Lonsdale, C., Lonsdale, C., Smith, H. 2003, MNRAS 342, 373CrossRefGoogle Scholar
Spergel, D. N., et al. 2007, ApJS 170, 377CrossRefGoogle Scholar
Tarchi, A., Castangia, P., Henkel, C., Menten, K. M. 2007, New Astron. Revs 51, 67CrossRefGoogle Scholar
Tilak, A., Greenhill, L. J., Done, C., Madejski, G. 2008, ApJ submittedGoogle Scholar
Trotter, A. S., Greenhill, L., Moran, J., Reid, M., Irwin, J., Lo, K.-Y., 1998, ApJ 495, 740CrossRefGoogle Scholar
Trotter, A. S., Moran, J., Greenhill, L., Zheng, X., Gwinn, C. 1997, ApJ (Letters) 485, L79CrossRefGoogle Scholar
Vignali, C., Brandt, W. N., Comastri, A., Darling, J. 2005, MNRAS 364, 99CrossRefGoogle Scholar
Wilson, A. S., Braatz, J. A., & Henkel, C. 1995, ApJ 455, L127Google Scholar
Yamauchi, A., Nakai, N., Sato, N., Diamond, P. 2004, PASJ 56, 605CrossRefGoogle Scholar
Yates, J. A., Richards, A. M. S., Wright, M. M., Collett, J. L., Gray, M. D., Field, D., Cohen, R. J. 2000, MNRAS 317, 28CrossRefGoogle Scholar
Zhang, J. S., Henkel, C., Kadler, M., Greenhill, L. J., Nagar, N., Wilson, A. S., Braatz, J. A. 2006, A&A 450, 933Google Scholar