| Abstract : | We aim to summarise our efforts to look for candidates for different rare sub-classes of radio galaxies using recent all-sky surveys (such as TGSS, FIRST, LoTSS etc.). Taking advantage of a large number of new sources of different sub-classes (like hybrid morphology radio galaxies, winged radio galaxies, head-tailed radio galaxies, etc.), we also studied various statistical properties of these sources. Recently, with the help of different all-sky surveys, we discovered the largest number of rare classes of radio galaxies. With the help of the Very Large Array (VLA) Faint Images of Radio Sky at Twenty-cm (FIRST) survey, we discovered 296 winged radio galaxies with X and Z-shaped structures (Bera, Pal et al., 2020). We discovered 717 head-tailed radio galaxies (a peculiar morphology of radio galaxies, with C and V-shaped) (Bera, Pal et al. 2022) and the largest number of thirty-three rarely found morphologies of radio galaxies known as hybrid morphology radio galaxies (HyMoRS) (Kumari & Pal 2022) with the help of the same survey (FIRST). HyMoRS exhibited a mixed morphology of radio galaxies, i.e., on one side it possesses FR-I structure, and on the other side FR-II structure can be seen in the structures of HyMoRS. A detailed study of fifty-eight sources, discovered from the TIFR GMRT Sky Survey, is presented in the recently published paper (Bhukta & Pal 2022). In this paper, we studied the evolution of winged radio galaxies and various types of radio galaxies with their measured linear sizes. With the help of the LOFAR Two-meter Sky survey, we also catalogued a list of fifty-five head-tailed radio galaxies (Pal & Kumari 2022). A list of 267 head-tailed radio galaxies was also discovered using the TIFR GMRT Sky Survey (Bhukta & Pal, 2022). |
