Intermittent maser flare around the high mass young stellar object G353.273+0.641 II: Detection of a radio and molecular jet

Abstract

We report the first detection of a radio-continuum and molecular jet associated with a dominant blue-shifted maser source, G353.273+0.641. A radio jet is extended 3000 au along NW-SE direction. H${}_2$O masers are found to be clustered in the root of a bipolar radio jet. A molecular jet is detected by thermal SiO ($\upsilon$ = 0, $J$ = 2-1) emission. The SiO spectrum is extremely wide (-120 -- +87 km s${}^{-1}$) and significantly blue-shift dominated, similar to the maser emission. The observed geometry and remarkable spectral similarity between H${}_2$O maser and SiO strongly suggests the existence of a maser-scale ($\sim$ 340 au) molecular jet that is enclosed by the extended radio jet. We propose a "disc-masking" scenario as the origin of the strong blue-shift dominance, where an optically thick disc obscures a red-shifted lobe of a compact jet.

5 pages, 3 figures, 2 tables, accepted for publication in MNRAS

References in corpus (2)

• Imaging the Ionized Disk of the High-Mass Protostar Orion-I
• The Rotating Molecular Structures and the Ionized Outflow Associated with IRAS 16547-4247

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