Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observational constraints on the cosmological evolution of
  dual-population radio sources   In this paper we show normalized differential source counts n(S) at 408 MHz
and 1.4 GHz of radio sources separately for FRI and FRII classes with extended
and compact morphologies. The maps from the FIRST, NVSS, and WENSS surveys are
used to define the source morphology and flux density. The counts provide a
basis for a direct test as well as constraining the cosmological evolution of
powerful extragalactic radio sources in terms of the dual-population model
(Jackson & Wall 1999), where radio sources of Fanaroff-Riley (1974) types I and
II are regarded as two physically separate types of active galactic nuclei
(AGN). The predicted count values are compared with the observational data to
find the best fits for the evolution and beaming parameters, and to further
refine the model.

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The categories of this paper are: hep-lat
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The categories of this paper are: supr-con
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The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: nucl-th
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The categories of this paper are: alg-geom
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The categories of this paper are: math-ph
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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: gr-qc
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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol