Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Infrared imaging of WENSS radio sources   We have performed deep imaging in the IR J- and K-bands for three sub-samples
of radio sources extracted from the Westerbork Northern Sky Survey, a large
low-frequency radio survey containing Ultra Steep Spectrum (USS), Gigahertz
Peaked Spectrum (GPS) and Flat Spectrum (FS) sources. We present the results of
these IR observations, carried out with the ARcetri Near Infrared CAmera
(ARNICA) at the Nordic Optical Telescope (NOT), providing photometric and
morphologic information on high redshift radio galaxies and quasars. We find
that the radio galaxies contained in our sample do not show the pronounced
radio/IR alignment claimed for 3CR sources. IR photometric measurements of the
gravitational lens system 1600+434 are also presented.

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The categories of this paper are: quant-ph
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The categories of this paper are: supr-con
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The categories of this paper are: nucl-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
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The categories of this paper are: stat
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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: chem-ph
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The categories of this paper are: q-bio