VLA observations of 20 FR II radio sources at 8.4 GHz

Abstract

We report the last observational paper of hot spots for 20 Fanaroff-Riley class II (FR II) sources. These sources are part of a large sample of 98 FR II to study the unification scheme of FR II radio galaxies (RGs) and quasars (QSRs) using the hotspots (HSs) location and morphology. Highresolution VLA observations at 8.4 GHz were conducted for the whole sample. The investigation of HSs properties in FR II radio sources is essential for a better understanding of the dynamics related to the objects and their impact on the surrounding environment. HSs were classified into edged and recessed types, where the former is located at a radio lobe's outer edge, and the latter is embedded within the lobe. The present sub-sample contains 12 RGs and 8 QSRs. Radio contour maps for each source were presented using the VLA in its A and B configurations. In total, we have identified 18 HSs for these 20 radio sources. The 12 RGs possess 8 edged HSs and 2 recessed HSs. The 8 QSRs possess 6 edged HSs and 2 recessed HSs. Out of the 14 edged HSs, RGs and QSRs possess ∼ 57% and ∼ 43%, respectively. A thorough morphological discussion of the 20 sources with their HSs is presented in the present work.

Flux densities and spectral indices of Relaxed Double radio galaxy 3C 84

“…separated low power and high power radio galaxies, respectively. Radio spectral properties of radio galaxies is very important feature, that is why a number of radio galaxies were discussed in papers [6][7][8] and references therein.…”