OBSERVATIONS OF ULTRALUMINOUS INFRARED GALAXIES AT 102 MHZ

Observations of 29 ultraluminous infrared galaxies have been conducted at the low frequency of 102 MHz for the first time. The observations were made on the Large Phased Array of the Lebedev Physical Institute. The method of interplanetary scintillations was used to identify compact radio sources. A scintillating radio source was detected only in IRAS 1056+24. Upper limits on the flux densities for most of the galaxies are given. A comparison with the flux estimates obtained at higher frequencies shows the existence of low-frequency cutoffs in their radio spectra. Assuming that these cutoffs arise from absorption in the thermal plasma, we infer the limiting values of the electron density n(e) for the nuclei of eight galaxies.