12 GHz methanol masers towards Parkes Methanol Multibeam 6.7 GHz maser detections

Physics

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Galactic, Mag Clouds, Parkes

Scientific paper

We request 128 hours of Parkes time to survey the 6.7 GHz methanol masers detected in the Parkes Methanol Multibeam (MMB) survey for associated 12 GHz methanol masers. This search will be the largest, most sensitive search for 12 GHz methanol masers ever completed and, unlike any previous similar searches, will be targeted towards an unbiased sample of 6.7 GHz methanol masers. Completion of the 12 GHz methanol maser search in the 2008 APRS semester presents a rare opportunity to compare many spectra of the 6.7 and 12GHz transitions from a single epoch, allowing meaningful intensity ratios of the transitions to be determined. We anticipate that the results of these observations will allow us to further explore and strengthen the results of a pilot search of a subset of 6.7 GHz MMB detections for 12 GHz masers completed by Lewis (2007). The data collected will allow us to investigate the relative evolutionary stages of massive star formation that the two transitions are tracing and study the physical conditions that are responsible for the presence or absence of associated 12 GHz methanol masers.

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