Methanol masers and the earliest stages of massive star formation

Details Methanol masers and the earliest stages of massive star formation Methanol masers and the earliest stages of massive star formation

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002evn..conf..205m&link_type=abstract

6th European VLBI Network Symposium on New Developments in VLBI Science and Technology, held in Bonn, June 25th-28th 2002, proce

Astronomy and Astrophysics

Astronomy

4

Scientific paper

6.7 and 12.2 GHz methanol masers were originally detected toward active star-forming regions. Since their discovery a decade ago, their role and their location have been better understood using high resolution interferometers. Observations with the EVN and the VLBA have shown that methanol masers are clearly associated with the earliest stages of massive star formation. They arise in hot molecular cores, in hyper compact regions of ionised gas, in ionised jets/outflows, in ultra-compact ion Hii region and in ion H ii region. Interestingly, the overall dimensions of the structures traced by the methanol masers increase during the evolution of the massive young stellar object. Our data suggest that they remain small and compact when associated with the massive protostar phase, and expand in sources associated with outflows. The methanol masers gradually disappear as the UC ion H ii region develops. Based on these results, an evolutionary sequence for massive star formation is presented in connection with the evolution of methanol masers.

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