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

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

Mar 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..242..150g&link_type=abstract

Astrophysical Masers and their Environments, Proceedings of the International Astronomical Union, IAU Symposium, Volume 242, p.

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Radio Lines: Ism, Stars: Formation

Scientific paper

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.

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