Studies of methanol maser rings

Details Studies of methanol maser rings Studies of methanol maser rings

2011-02-04

arxiv.org/abs/1102.0854v1

Astronomy and Astrophysics

Astrophysics

Galaxy Astrophysics

Accepted for publication in the proceedings of the "10th European VLBI Network Symposium and EVN Users Meeting: VLBI and the n

Scientific paper

We present the results of studies of a new class of 6.7 GHz methanol maser sources with a ring-like emission structure discovered recently with the EVN. We have used the VLA to search for water masers at 22 GHz and radio continuum at 8.4 GHz towards a sample of high-mass star forming regions showing a ring-like distribution of methanol maser spots. Using the Gemini telescopes we found mid-infrared (MIR) counterparts of five methanol rings with a resolution of 0."15. The centres of methanol maser rings are located within, typically, only 0."2 of the MIR emission peak, implying their physical relation with a central star. These results strongly support a scenario wherein the ring-like structures appear at the very early stage of massive star formation before either water-maser outflows or H II regions are seen.

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