Detection of a new methanol maser line with ALMA

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.

4 pages, 4 figures, accepted by Astronomy and Astrophysics

References in corpus (2)

• Class I methanol masers in the outflow of IRAS 16547-4247
• How do methanol masers manage to appear in the youngest star vicinities and isolated molecular clumps?

Cited by in corpus (10)

• Discovery of six new class II methanol maser transitions, including the unambiguous detection of three torsionally excited lines toward G358.931-0.030
• ALMA View of the Infalling Envelope around a Massive Protostar in S255IR SMA1
• Methanol masers in NGC 253 with ALCHEMI
• Dense Cores, Filaments and Outflows in the S255IR Region of High Mass Star Formation
• Unveiling the traits of massive young stellar objects through a multi-scale survey
• The methanol emission in the $J_1-J_0$ A${}^{-+}$ line series as a tracer of specific physical conditions in high-mass star-forming regions
• APEX Millimeter Observations of Methanol Emission Toward High-Mass Star-Forming Cores
• Fine structure and kinematics of the ionized and molecular gas in the jet and disk around S255IR NIRS3 from high resolution ALMA observations
• Spectral survey of a Hot core with an Eruptive Accretion in S255IR NIRS3 (SHEA): The discovery of class I and class II millimeter methanol maser transitions
• Study of the high-mass star-forming region S255IR at various scales