Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radio jets and gamma-ray emission in radio-silent narrow-line Seyfert 1
  galaxies   We have detected six narrow-line Seyfert 1 (NLS1) galaxies at 37 GHz that
were previously classified as radio silent and two that were classified as
radio quiet. These detections reveal the presumption that NLS1 galaxies
labelled radio quiet or radio silent and hosted by spiral galaxies are unable
to launch jets to be incorrect. The detections are a plausible indicator of the
presence of a powerful, most likely relativistic jet because this intensity of
emission at 37 GHz cannot be explained by, for example, radiation from
supernova remnants. Additionally, one of the detected NLS1 galaxies is a newly
discovered source of gamma rays and three others are candidates for future
detections.

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The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: nlin
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-ex
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The categories of this paper are: eess
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The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an
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The categories of this paper are: physics
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-th
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The categories of this paper are: cs
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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol