Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spatially Resolved Ultraviolet, H-alpha, Infrared, and Radio Star
  Formation in M81   We present Multiband Imaging Photometer for Spitzer (MIPS) observations of
M81 at 24, 70, and 160 micron. The grand design nature of M81 is clearly seen,
showing two well resolved spiral arms containing numerous bright star forming
regions. The MIPS images reveal a significant amount of cold dust associated
with the spiral arms. We investigate the variation of the ultraviolet (UV),
H-alpha, and infrared (IR) luminosities and star formation rate (SFR)
indicators across the face of M81 using the MIPS images and archival UV and
H-alpha images. For regions in M81, we find that UV and H-alpha SFRs
(uncorrected for dust attenuation) are always lower than the IR SFR. The cause
of this behavior is dust attenuation and/or using SFR calibrations appropriate
for entire galaxies, not regions in galaxies. The characteristics of the dust
attenuation for the regions indicate the dust grains and/or geometry are
different from those in starburst galaxies. The behavior of the infrared-radio
correlation in M81 is seen to vary from the global average, with variations
correlated with the morphology of M81.

33
The categories of this paper are: plasm-ph
34
The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
3
The categories of this paper are: physics
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
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The categories of this paper are: atom-ph
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: solv-int