Compact steep-spectrum sources from the S4 sample |
| |
| Authors: | D J Saikia S Jeyakumar C J Salter P Thomasson R E Spencer F Mantovani |
| |
| Institution: | Tata Institute of Fundamental Research, National Centre for Radio Astrophysics, P. B. No. 3, Ganeshkhind, Pune 411 007, India;Arecibo Observatory, HC3 Box 53995, Arecibo, Puerto Rico 00612, USA;University of Manchester, NRAL, Jodrell Bank, Macclesfield, Cheshire SK11 9DL;Istituto di Radioastronomia del CNR, Via P. Gobetti 101, I-40129 Bologna, Italy |
| |
| Abstract: | We present the results of 5-GHz observations with the VLA A-array of a sample of candidate compact steep‐spectrum (CSS) sources selected from the S4 survey. We also estimate the symmetry parameters of high-luminosity CSS sources selected from different samples of radio sources, and compare these with the larger sources of similar luminosity to understand their evolution and the consistency of the CSS sources with the unified scheme for radio galaxies and quasars. The majority of CSS sources are likely to be young sources advancing outwards through a dense asymmetric environment. The radio properties of CSS sources are found to be consistent with the unified scheme, in which the axes of the quasars are observed close to the line of sight, while radio galaxies are observed close to the plane of the sky. |
| |
| Keywords: | galaxies: active galaxies: jets galaxies: nuclei quasars: general radio continuum: galaxies |
|
|
