Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical spectral properties of radio loud quasars along the main
  sequence   We analyze the optical properties of Radio-Loud quasars along the Main
Sequence (MS) of quasars. A sample of 355 quasars selected on the basis of
radio detection was obtained by cross-matching the FIRST survey at 20cm and the
SDSS DR12 spectroscopic survey. We consider the nature of powerful emission at
the high-FeII end of the MS. At variance with the classical radio-loud sources
which are located in the Population B domain of the MS optical plane, we found
evidence indicating a thermal origin of the radio emission of the highly
accreting quasars of Population A.

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The categories of this paper are: physics
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The categories of this paper are: chao-dyn
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The categories of this paper are: nlin
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The categories of this paper are: cs
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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: dg-ga
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: hep-lat
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The categories of this paper are: econ
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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc