Scintillation in the Circinus Galaxy H2O Megamasers | Zendy

Jamie McCallum | Zendy; S. P. Ellingsen | Zendy; D. L. Jauncey | Zendy; J. E. J. Lovell | Zendy; L. J. Greenhill | Zendy

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Scintillation in the Circinus Galaxy H₂O Megamasers

Author(s) -

Jamie McCallum,

S. P. Ellingsen,

D. L. Jauncey,

J. E. J. Lovell,

L. J. Greenhill

Publication year - 2005

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/427399

Subject(s) - scintillation , physics , galaxy , astrophysics , telescope , interstellar medium , astronomy , milky way , active galactic nucleus , optics , detector

We present observations of the 22 GHz water vapor megamasers in the Circinusgalaxy made with the Tidbinbilla 70m telescope. These observations confirm therapid variability seen earlier by Greenhill et al (1997). We show that thisrapid variability can be explained by interstellar scintillation, based on whatis now known of the interstellar scintillation seen in a significant number offlat spectrum AGN. The observed variability cannot be fully described by asimple model of either weak or diffractive scintillation.Comment: 10 pages, 5 figures. AJ accepte

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