Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Bar-driven Transport of Molecular Gas in Spiral Galaxies: Observational
  Evidence   The NRO-OVRO CO imaging survey showed that molecular gas was more
concentrated to the central kiloparsec in barred spiral galaxies than in their
unbarred counterparts. The result provided not only evidence for bar-driven gas
transport but also estimates on the mean rate of gas transfer and lower limits
to the lifetime of bars. Other lines of evidence for the bar-driven transport
of ISM in spiral galaxies are summarized. They are complementary with each
other.

35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg