Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Distance to the Low-velocity Cloud in the Direction of the High-velocity
  Compact Cloud CO--0.40--0.22   CO--0.40--0.22 is a peculiar molecular cloud that is compact and has an
extraordinary broad velocity width. It is found in the central molecular zone
of our Galaxy. In this direction, there is another cloud with an H$_2$O maser
spot at a lower velocity. Collision with this low-velocity cloud could be
responsible for the broad velocity width of CO--0.40--0.22. We performed
phase-referencing VLBI astrometry with VERA and detected the annual parallax of
the H$_2$O maser spot in the low-velocity cloud to be $0.33 \pm 0.14$ mas,
which corresponds to a distance of $3.07^{+2.22}_{-0.91}$ kpc from the Sun.
This implies that the low-velocity cloud is located in the Galactic disk on the
near side of the central molecular zone.

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The categories of this paper are: dg-ga
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The categories of this paper are: cs
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
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The categories of this paper are: chao-dyn
2
The categories of this paper are: math
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The categories of this paper are: solv-int
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The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
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The categories of this paper are: quant-ph
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The categories of this paper are: econ
14
The categories of this paper are: math-ph
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The categories of this paper are: supr-con
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The categories of this paper are: hep-lat
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-alg