Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Variability of Quasars at 10 microns   Twenty five low redshift quasars have been monitored for several decades at
five near- and mid-infrared wavelengths to detect rapid variations which would
indicate that a nonthermal component was present in the "10 micron bump". Such
variability has apparently been detected in several radio loud quasars and in
the radio quiet quasar PG1535+547. In addition, the structure function of
PG1226+023 shows that an apparently periodic component is present in its
near-infrared emission.

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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: plasm-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: econ
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The categories of this paper are: adap-org
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: nlin
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The categories of this paper are: q-bio
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: chao-dyn
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The categories of this paper are: cond-mat
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The categories of this paper are: cs