Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radio properties of ten nearby ultraluminous infrared galaxies with
  signatures of luminous buried active galactic nuclei   We present the results of our multifrequency observations for 10
ultraluminous infrared galaxies (ULIRGs) made by the Karl G. Jansky Very Large
Array at 1.4, 5.5, 9.0, and 14.0 GHz. Our sample is selected from ULIRGs whose
active galactic nuclei (AGNs) are not found at optical wavelengths ($\sim$70%
of the entire ULIRGs), but whose presence is suggested by mid-infrared or
submillimetre observations ($>50$% of the non-AGN ULIRGs at optical
wavelengths). The statistical properties of the targets are similar to those of
the entire ULIRG sample, which implies that ULIRGs have common radiative
processes regardless of the presence of optical AGNs, and thus AGNs might
equally contribute to the radio emission of every ULIRG. Although their spectra
are mainly explained by starbursts and/or merger activity, some individual
sources suggest contributions from AGNs. IRAS 00188$-$0856, whose optical
morphology is not disturbed, shows a large nonthermal fraction and a spectral
break at high frequency, which can be explained by synchrotron ageing of
nonthermal plasma emitted from AGNs. In addition, we find 100-kpc scale
extended emission associated with IRAS 01004$-$2237. The two-sided morphology
and absence of extended X-ray emission suggest that this system is not induced
by a merger in a cluster but originates from AGN activity.

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The categories of this paper are: physics
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The categories of this paper are: solv-int
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The categories of this paper are: adap-org
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The categories of this paper are: hep-lat
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The categories of this paper are: patt-sol
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The categories of this paper are: gr-qc
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom
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The categories of this paper are: nucl-ex
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The categories of this paper are: math
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The categories of this paper are: q-alg
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The categories of this paper are: cond-mat
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The categories of this paper are: chao-dyn
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The categories of this paper are: quant-ph