Abstract Details
| Name: Lopamudra Ojha Affiliation: Midnapore City College Conference ID: ASI2019_355 Title : Spectral ageing study of southern hemisphere radio galaxies Authors and Co-Authors : Lopamudra Ojha, Sabyasachi Pal and Dusmanta Patra Abstract Type : Poster Abstract Category : Extragalactic Astronomy Abstract : We report the spectral ageing analysis of FR-II type radio galaxies collected from GaLactic and Extragalactic All-sky MWA (GLEAM) survey using Murchison Widefield Array (MWA). GLEAM survey was conducted in the low-frequency range from 72 MHz to 231 MHz. We have used available radio maps in this frequency range to perform the spectral ageing analysis. We have used two widely used models for spectral ageing, namely, the Kardashev-Pacholczyk (KP) and Jaffe-Perola (JP) models. The above two models are based on a single electron injection energy distribution at the hot-spots of the radio galaxy. In the KP model, the assumption is that the pitch angle is constant for each individual electron but different for different electron while in the JP model it is assumed that the pitch angles are to be scattered and isotropised in a time-scale which is much smaller in comparison with the spectral age of the source. We have made a statistical study of spectral ageing properties of these radio galaxies to understand properties of FRII radio galaxies in general. We have also studied the magnetic field and jet power of these radio galaxies. |