Studies of methanol maser rings
Abstract
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.
Keywords
Cite
@article{arxiv.1102.0854,
title = {Studies of methanol maser rings},
author = {A. Bartkiewicz and M. Szymczak and H. J. van Langevelde and J. M. De Buizer and Y. Pihlström},
journal= {arXiv preprint arXiv:1102.0854},
year = {2015}
}
Comments
Accepted for publication in the proceedings of the "10th European VLBI Network Symposium and EVN Users Meeting: VLBI and the new generation of radio arrays", eds Beswick et al., PoS(10th EVN Symposium)003