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We present the results of our multifrequency observations for 10ultraluminous infrared galaxies (ULIRGs) made by the Karl G. Jansky Very LargeArray at 1.4, 5.5, 9.0, and 14.0 GHz. Our sample is selected from ULIRGs whoseactive galactic nuclei (AGNs) are not found at optical wavelengths ($\sim$70%of the entire ULIRGs), but whose presence is suggested by mid-infrared orsubmillimetre observations ($>50$% of the non-AGN ULIRGs at opticalwavelengths). The statistical properties of the targets are similar to those ofthe entire ULIRG sample, which implies that ULIRGs have common radiativeprocesses regardless of the presence of optical AGNs, and thus AGNs mightequally contribute to the radio emission of every ULIRG. Although their spectraare mainly explained by starbursts and/or merger activity, some individualsources suggest contributions from AGNs. IRAS 00188$-$0856, whose opticalmorphology is not disturbed, shows a large nonthermal fraction and a spectralbreak at high frequency, which can be explained by synchrotron ageing ofnonthermal plasma emitted from AGNs. In addition, we find 100-kpc scaleextended emission associated with IRAS 01004$-$2237. The two-sided morphologyand absence of extended X-ray emission suggest that this system is not inducedby a merger in a cluster but originates from AGN activity.

Radio properties of ten nearby ultraluminous infrared galaxies with signatures of luminous buried active galactic nuclei