Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Giant Molecular Clouds in the Dwarf Galaxy NGC1569   We present CO (1-0) and (2-1) observations of the dwarf starburst galaxy NGC
1569 with the IRAM interferometer on Plateau de Bure. We find the CO emission
is not spatially associated with the two super star clusters in the galaxy, but
rather is found in the vicinity of an HII region. With the resolution of our
data, we can resolve the CO emission into five distinct giant molecular clouds,
four are detected at both transitions. In the (1-0) transition the sizes and
linewidths are similar to those of GMCs in the Milky Way Galaxy and other
nearby systems, with diameters ranging from about 40 to 50 pc and linewidths
from 4 to 9 \kms. The (2-1)/(1-0) line ratios range from 0.64 +- 0.30 to 1.31
+- 0.60 in the different clouds. The lower line ratios are similar to those
seen in typical Galactic GMCs, while values higher than unity are often seen in
interacting or starburst galaxies. We use the virial theorem to derive the
CO-H(2) conversion factor for three of the clouds, and we adopt an average
value of 6.6 +-1.5 times the Galactic conversion factor for NGC 1569 in
general. We discuss the role of the molecular gas in NGC 1569, and its
relationship to the hot component of the ISM. Finally, we compare our
observations with blue compact dwarf galaxies which have been mapped in CO.

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The categories of this paper are: chem-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: math
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The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: stat
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The categories of this paper are: econ
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The categories of this paper are: cond-mat
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: math-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: patt-sol