Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intermittent maser flare around the high mass young stellar object
  G353.273+0.641 II: Detection of a radio and molecular jet   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.

0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
37
The categories of this paper are: supr-con
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
10
The categories of this paper are: q-bio