Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Highly efficient star formation in NGC 5253 possibly from stream-fed
  accretion   A local dwarf galaxy, NGC 5253, has a young super star cluster that may
provide an example of highly efficient star formation. Here we report the
detection and imaging, with the Submillimeter Array, of the J= 3-2 rotational
transition of CO at the location of the massive cluster associated with the
supernebula. The gas cloud is hot, dense, quiescent, and extremely dusty. Its
gas-to-dust ratio is lower than the Galactic value, which we attribute to dust
enrichment by Wolf-Rayet stars within the embedded star cluster. Its star
formation efficiency exceeds 50%, ten times higher than clouds in the Milky
Way: this cloud is a factory of stars and soot. We suggest that high efficiency
results from the force-feeding of star formation by a streamer of gas falling
into the galaxy.

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The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
19
The categories of this paper are: eess
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
21
The categories of this paper are: adap-org