Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A collimated jet and an infalling-rotating disk in G192.16-3.84 traced
  by H2O maser emission   We report H2O masers associated with the massive-star forming region
G192.16-3.84 observed with the new Japan VLBI network at three epochs spanned
for two months, which have revealed the three-dimensional kinematical structure
of the whole \h2o maser region in G192.16-3.84, containing two young stellar
objects separated by ~1200 AU. The maser spatio-kinematical structure has well
persisted since previous observations, in which the masers are expected to be
associated with a highly-collimated bipolar jet and an infalling-rotating disk
in the northern and southern clusters of H2O maser features, respectively. We
estimated a jet expansion speed of ~100 km/s and re-estimated a dynamical age
of the whole jet to be 5.6x10^4 yrs. We have investigated the spatial
distribution of Doppler velocities during the previous and present observations
and relative proper motions of H2O maser features in the southern cluster, and
a relative bulk motion between the two maser clusters. They are well explained
by a model of an infalling-rotating disk with a radius of ~1000 AU and a
central stellar mass of 5-10 M_sun, rather than by a model of a bipolar jet
perpendicular to the observed CO outflow. Based on the derived H2O maser
spatio-kinematical parameters, we discuss the formation mechanism of the
massive young stellar objects and the outflow development in G192.16-3.84.

33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
35
The categories of this paper are: mtrl-th
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ