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.

arXiv comment4 pages, 4 figures, accepted by Astronomy and Astrophysics

References in corpus (13)

• Models of class II methanol masers based on improved molecular data
• Disk-mediated accretion burst in a high-mass young stellar object
• Southern class I methanol masers at 36 and 44 GHz
• Class I methanol masers in the outflow of IRAS 16547-4247
• H2O masers in a jet-driven bowshock: Episodic ejection from a massive young stellar object
• The Relationship between Class I and Class II Methanol Masers
• Different Evolutionary Stages in the Massive Star Forming Region S255 Complex
• The disk-outflow system in the S255IR area of high mass star formation
• Planar infall of CH3OH gas around Cepheus A HW2
• Velocity and magnetic fields within 1000 AU from a massive YSO
• A Multi-Wavelength High Resolution Study of the S255 Star Forming Region. General structure and kinematics
• Maser action in methanol transitions
• How do methanol masers manage to appear in the youngest star vicinities and isolated molecular clumps?

Cited by in corpus (15)

• Sub-arcsecond (sub)millimeter imaging of the massive protocluster G358.93-0.03: Discovery of 14 new methanol maser lines associated with a hot core
• Burst occurrence in young massive stellar objects
• A Submillimeter Burst of S255IR~SMA1 - The Rise And Fall Of Its Luminosity
• 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
• Disks and outflows in the S255IR area of high mass star formation from ALMA observations
• 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
• Study of variable stars associated with maser sources: G025.65+1.05
• 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