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

Abstract

We report the detection of the millimeter CH${}_3$OH masers including a new detection of class I (11${}_{0,11}$-10${}_{1,10}$A) and class II (6${}_{1,5}$-5${}_{2,4}$E) maser transitions toward the high-mass protostar S255IR NIRS3 in post-burst phase. The CH${}_3$OH emissions were detected as a mixture of maser and thermal characteristics. We examine the detected transitions using an excitation diagram and LTE model spectra and compare the observed properties with those of thermal lines. Class II CH${}_3$OH maser transitions showed distinctive intensity and velocity distributions from those of thermal transitions. Bright distinct emission components in addition to the fragmented and arc-shaped emissions are only detected in class I CH${}_3$OH maser transitions toward southern and western directions from the protostellar position, implying the presence of the slow outflow shocks.

9 pages, 4 Figures, 1 Table, Accepted for publication in ApJL

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Cited by in corpus (3)

• A misaligned protostellar disk fed by gas streamers in a barred spiral-like massive dense core
• Study of the high-mass star-forming region S255IR at various scales
• Digging into the Massive Protostar S255IR NIRS3: A Study of Nitrogen-Bearing Molecules and Their Prebiotic Chemistry