Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A detailed analysis on the cloud structure and dynamics in Aquila Rift   We present maps in several molecular emission lines of a 1 square-degree
region covering the W40 and Serpens South molecular clouds belonging to the
Aquila Rift complex. The observations were made with the 45 m telescope at the
Nobeyama Radio Observatory. We found that the $^{12}$CO and $^{13}$CO emission
lines consist of several velocity components with different spatial
distributions. The component that forms the main cloud of W40 and Serpens
South, which we call the "main component", has a velocity of $V_{\rm LSR}\simeq
7$ km s$^{-1}$. There is another significant component at $V_{\rm LSR}\simeq
40$ km s$^{-1}$, which we call the "40 km s$^{-1}$ component". The latter
component is mainly distributed around two young clusters: W40 and Serpens
South. Moreover, the two components look spatially anti-correlated. Such
spatial configuration suggests that the star formation in W40 and Serpens South
was induced by the collision of the two components. We also discuss a
possibility that the 40 km s$^{-1}$ component consists of gas swept up by
superbubbles created by SNRs and stellar winds from the Scorpius-Centaurus
Association.

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The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
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The categories of this paper are: eess
32
The categories of this paper are: atom-ph
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The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: hep-th
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The categories of this paper are: stat