Scintillation in the circinus galaxy H 2O megamasers

Jamie N. McCallum; Simon P. Ellingsen; David L. Jauncey; James E.J. Lovell; Lincoln J. Greenhill

doi:10.1086/427399

Scintillation in the circinus galaxy H ₂O megamasers

Jamie N. McCallum, Simon P. Ellingsen, David L. Jauncey, James E.J. Lovell, Lincoln J. Greenhill

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

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.

Original language	English
Pages (from-to)	1231-1236
Number of pages	6
Journal	Astronomical Journal
Volume	129
Issue number	3
DOIs	https://doi.org/10.1086/427399
Publication status	Published - Mar 2005
Externally published	Yes

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title = "Scintillation in the circinus galaxy H 2O megamasers",

abstract = "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.",

keywords = "Galaxies: active, Galaxies: individual (Circinus), Galaxies: seyfert, ISM: molecules, Masers",

author = "McCallum, {Jamie N.} and Ellingsen, {Simon P.} and Jauncey, {David L.} and Lovell, {James E.J.} and Greenhill, {Lincoln J.}",

year = "2005",

month = mar,

doi = "10.1086/427399",

language = "English",

volume = "129",

pages = "1231--1236",

journal = "Astronomical Journal",

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T1 - Scintillation in the circinus galaxy H 2O megamasers

AU - McCallum, Jamie N.

AU - Ellingsen, Simon P.

AU - Jauncey, David L.

AU - Lovell, James E.J.

AU - Greenhill, Lincoln J.

PY - 2005/3

Y1 - 2005/3

N2 - 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.

AB - 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.

KW - Galaxies: active

KW - Galaxies: individual (Circinus)

KW - Galaxies: seyfert

KW - ISM: molecules

KW - Masers

UR - http://www.scopus.com/inward/record.url?scp=18444410764&partnerID=8YFLogxK

U2 - 10.1086/427399

DO - 10.1086/427399

M3 - Article

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VL - 129

SP - 1231

EP - 1236

JO - Astronomical Journal

JF - Astronomical Journal

IS - 3

ER -

Scintillation in the circinus galaxy H ₂O megamasers

Abstract

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