ANGULAR BRIGHTNESS DISTRIBUTION OF QUASAR 3С268.4 AT DECAMETER WAVELENGTHS

Using the URAN VLBI network, we studied an angular structure of the 3C268.4 quasar at the decameter wavelengths. It is shown, that the brightness distribution of the source in the decameter range differs significantly from the decimeter image of the quasar. At low frequencies, the source model consists of two extended components and a compact feature, whose sizes and positions coincide with the parameters of lobes and one of the hot spots of 3C268.4 observed in the decimeter range. The radio emission of the second hot spot at decameter wavelengths is quite weak and does not significantly affect interferometer response. The probable spectra of the quasar components and their changes in the range from decameter to decimeter wavelengths are determined in the study as well. It is noted that, in contrast to the high-frequency image, where compact hot spots predominate in the 3C268.4 radiation, at decameter wavelengths about 65% of the source flux density is provided by more extended lobes. We have also shown that the change in the slope of the full spectrum of the quasar at 230 MHz is caused by synchrotron losses in its lobes.