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Scintillation in the Circinus Galaxy H2O Megamasers


McCallum, J and Ellingsen, SP and Jauncey, DL and Lovell, JEJ and Greenhill, LJ, Scintillation in the Circinus Galaxy H2O Megamasers, The Astronomical Journal, 129, (3) pp. 1231-1236. ISSN 0004-6256 (2005) [Refereed Article]

DOI: doi:10.1086/427399


We present observations of the 22 GHz water vapor megamasers in the Circinus galaxy made with the Tidbinbilla 70 m telescope. These observations confirm the rapid variability seen earlier by Greenhill et al. We show that this rapid variability can be explained by interstellar scintillation, based on what is now known of the interstellar scintillation seen in a significant number of flat-spectrum active galactic nuclei. The observed variability cannot be fully described by a simple model of either weak or diffractive scintillation. © 2005. The American Astronomical Society. All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:McCallum, J (Dr Jamie McCallum)
UTAS Author:Ellingsen, SP (Professor Simon Ellingsen)
UTAS Author:Lovell, JEJ (Dr Jim Lovell)
ID Code:34478
Year Published:2005
Funding Support:Australian Research Council (DP0342500)
Web of Science® Times Cited:10
Deposited By:Physics
Deposited On:2005-08-01
Last Modified:2007-08-28

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