Detection of a new methanol maser line with ALMA

I. Zinchenko; S. -Y. Liu; Y. -N. Su; A. M. Sobolev

doi:10.1051/0004-6361/201731752

Detection of a new methanol maser line with ALMA

Astrophysics of Galaxies 2017-10-11 v2

Authors: I. Zinchenko , S. -Y. Liu , Y. -N. Su , A. M. Sobolev

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Abstract

Aims. We aimed at investigating the structure and kinematics of the gaseous disk and outflows around the massive YSO S255 NIRS3 in the S255IR-SMA1 dense clump. Methods. Observations of the S255IR region were carried out with ALMA at two epochs in the compact and extended configurations. Results. We serendipitously detected a new, never predicted, bright maser line at about 349.1 GHz, which most probably represents the CH $_3$ OH $14_{1} - 14_{0}$ A $^{- +}$ transition. The emission covers most of the 6.7 GHz methanol maser emission area of almost 1 $^{\prime\prime}$ in size and shows a velocity gradient in the same sense as the disk rotation. No variability was found on the time interval of several months. It is classified as Class II maser and probably originates in a ring at a distance of several hundreds AU from the central star.

Keywords

massive YSO methanol maser ALMA observations S255IR-SMA1 Class II maser

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@article{arxiv.1709.08889,
  title  = {Detection of a new methanol maser line with ALMA},
  author = {I. Zinchenko and S. -Y. Liu and Y. -N. Su and A. M. Sobolev},
  journal= {arXiv preprint arXiv:1709.08889},
  year   = {2017}
}

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4 pages, 4 figures, accepted by Astronomy and Astrophysics

Detection of a new methanol maser line with ALMA

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