CSSs in a sample of B2 radio sources of intermediate strength

Abstract

We present radio observations of 19 candidate compact steep-spectrum (CSS) objects selected from a well-defined, complete sample of 52 B2 radio sources of intermediate strength. These observations were made with the VLA A-array at 4.835 GHz. The radio structures of the entire sample are summarised and the brightness asymmetries within the compact sources are compared with those of the more extended ones, as well as with those in the 3CRR sample and the CSSs from the B3-VLA sample. About 25 per cent of the CSS sources exhibit large brightness asymmetries, with a flux density ratio for the opposing lobes of $>$5, possibly due to interaction of the jets with infalling material. The corresponding percentage for the larger-sized objects is only about 5 per cent. We also investigate possible dependence of the flux density asymmetry of the lobes on redshift, since this might be affected by more interactions and mergers in the past. No such dependence is found. A few individual objects of interest are discussed in the paper.

10 pages, 7 figures, 2 tables; accepted for publication in Astronomy and Astrophysics

References in corpus (8)

• Radio galaxies with a `double-double' morphology: I - Analysis of the radio properties and evidence for interrupted activity in active galactic nuclei
• HI absorption in radio galaxies: effect of orientation or interstellar medium?
• The COINS Sample - VLBA Identifications of Compact Symmetric Objects
• Compact steep-spectrum sources from the S4 sample
• An asymmetric relativistic model for classical double radio sources
• Collimation of extragalactic radio jets in compact steep spectrum and larger sources
• Redshifts and Neutral Hydrogen Observations of Compact Symmetric Objects in the COINS Sample
• FIRST-based survey of Compact Steep Spectrum sources I. MERLIN images of arc-second scale objects

Cited by in corpus (13)

• Compact steep-spectrum and peaked-spectrum radio sources
• Probing radio source environments via HI and OH absorption
• Very Light Jets I. Axisymmetric Parameter Study and Analytic Approximation
• J0041+3224: a new double-double radio galaxy
• Jet propagation and the asymmetries of CSS radio sources
• The Kinematic and Spectral Ages of the Compact Radio Source CTD 93
• Polarization asymmetry in CSS sources: evidence of AGN fuel?
• FIRST-based survey of Compact Steep Spectrum sources, II. MERLIN and VLA observations of Medium-sized Symmetric Objects
• Numerical calculations of spectral turnover and Synchrotron Self Absorption in CSS and GPS radio sources
• 3C459: A highly asymmetric radio galaxy with a starburst
• FIRST-based survey of Compact Steep Spectrum sources, III. MERLIN and VLBI observations of subarcsecond-scale objects
• X-ray emission around the z=4.1 radio galaxy TNJ1338-1942 and the potential role of far-infrared photons in AGN Feedback
• Estimating black hole masses in young radio sources using CFHT spectroscopy