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Tick tock – the 12.2 GHz methanol masers in G9.62+0.20

Published online by Cambridge University Press:  01 March 2007

Michael J. Gaylard  and
Sharmila Goedhart
Michael J. Gaylard
Affiliation:
Hartebeesthoek Radio Astronomy Observatory, PO Box 443, Krugersdorp 1740, South Africa email: mike@hartrao.ac.za
Sharmila Goedhart
Affiliation:
Hartebeesthoek Radio Astronomy Observatory, PO Box 443, Krugersdorp 1740, South Africa email: mike@hartrao.ac.za
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Abstract

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The bright interstellar methanol masers at 12.2 GHz and 6.7 GHz were discovered in 1987 and 1991 respectively. It was soon established that many were quite variable. Goedhart Gaylard & van der Walt (2003) reported that one source, G9.62+0.20E, exhibited flares at 12.2 and 6.7 GHz that appeared to be periodic, repeating every 246 days. Since then, monitoring of this and other possibly periodic sources has continued with the 26-m Hartebeesthoek telescope. We discuss here the full 12.2 GHz time series data of G9.62+0.20 through 2006. The data quality has been much improved by telescope upgrades. Flares in the main maser peak continue, the repetition rate remains close to that originally determined.

Keywords

radio lines: ISMstars: formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 150 - 151
Copyright
Copyright © International Astronomical Union 2008

References

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