Scintillation in the Circinus Galaxy water megamasers

Details Scintillation in the Circinus Galaxy water megamasers Scintillation in the Circinus Galaxy water megamasers

2004-11-12

arxiv.org/abs/astro-ph/0411320v1

Astronomy and Astrophysics

Astrophysics

10 pages, 5 figures. AJ accepted

Scientific paper

10.1086/427399

We present observations of the 22 GHz water vapor megamasers in the Circinus galaxy made with the Tidbinbilla 70m telescope. These observations confirm the rapid variability seen earlier by Greenhill et al (1997). 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 AGN. The observed variability cannot be fully described by a simple model of either weak or diffractive scintillation.

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