Multi-frequency study of large size radio galaxies 3C 35 and 3C 284

We report multi-frequency observations of two large radio galaxies, 3C 35 and 3C 284. The low-frequency observations were done with Giant Metrewave Radio Telescope starting from - 150 MHz, and the high-frequency observations were done with the Very Large Array. We have studied the radio morphology of these two sources at different frequencies. We present the spectral ageing map using two of the most widely used models, the Kardashev-Pacholczyk and Jaffe-Perola models. Another more realistic and complex Tribble model is also used. We also calculate the jet power and the speed of the radio lobes of these galaxies. We check whether any episodic jet activity is present in these galaxies and found no sign of such activity. (c) 2023 COSPAR. Published by Elsevier B.V. All rights reserved.