Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thermal-IR Detection of Optical Outflow Sources in OMC1 South   We present the first thermal-infrared imaging photometry for several embedded
sources in the OMC1 South cloud core in the Orion nebula, and propose that some
of these drive optical Herbig-Haro jets emerging from the region.
Thermal-infrared images at 8.8 and 11.7 micron obtained at Gemini South show a
handful of sources in OMC1-S with no visual-wavelength counterparts, although a
few can be seen in recent near-infrared data. For the three brightest
mid-infrared sources, we also present 18.75 micron photometry obtained with the
Keck telescope. The most prominent blueshifted outflows in the Orion nebula at
visual wavelengths such as HH202, HH203/204, HH529, and HH269 all originate
from OMC1-S. The brightest infrared source in OMC1-S at 11.7 micron is located
at the base of the prominent jet that powers HH202 and is likely to be the
sought-after driver of this outflow. The second brightest infrared source is
located at the base of the HH529 jet. We consider the possibility that
HH203/204 and HH269 trace parts of a single bent outflow from the
third-brightest infrared source. While there may be some lingering ambiguity
about which infrared stars drive specific jets, there is now a sufficient
number of embedded sources to plausibly account for the multiple outflows from
OMC1-S.

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The categories of this paper are: nlin
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The categories of this paper are: math
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: cond-mat
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
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The categories of this paper are: q-bio
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
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The categories of this paper are: math-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin