Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A High-Resolution Very Large Array Observation of a Protostar in OMC-3:
  Shock-induced X-ray Emission by a Protostellar Jet   Using the Very Large Array (VLA) in the A-configuration, we have obtained a
high-resolution 3.6 cm map of a hard X-ray source detected by the Chandra X-ray
Observatory in a protostellar clump in Orion molecular cloud 3. Two radio
continuum sources were detected in the vicinity of the X-ray source, both of
which have NIR counterparts. We conclude that these VLA sources are free-free
emission produced by shocks in protostellar jets from the NIR class I
protostars. Using the centimeter data, we determined the power and orientation
of the protostellar jets. The center position of the X-ray emission was found
to be ~1--2" offset from the exciting sources of the jets, and the displacement
is in the direction of the jets and molecular outflows. We discuss the nature
of the X-ray emission as the shock-excited plasma at the shock front where the
jet propagates through interstellar medium at a speed of ~1000 km/s.

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The categories of this paper are: hep-th
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The categories of this paper are: nucl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: math-ph
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The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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The categories of this paper are: bayes-an
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The categories of this paper are: econ
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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: gr-qc