Symmetry Parameters of CSS Sources: Evidence of Fuelling?

@article{Saikia2003SymmetryPO,
  title={Symmetry Parameters of CSS Sources: Evidence of Fuelling?},
  author={D. J. Saikia and S. Jeyakumar and F. Mantovani and C. Salter and R. Spencer and P. Thomasson and P. Wiita},
  journal={Publications of the Astronomical Society of Australia},
  year={2003},
  volume={20},
  pages={50 - 56}
}
Abstract The compact steep spectrum (CSS) and gigahertz peaked spectrum (GPS) sources are widely believed to be young radio sources, with ages ≤106 yr. If the activity in the nucleus is fuelled by the supply of gas, one might find evidence of this gas by studying the structural and polarisation characteristics of CSS sources and their evolution through this gas. In this paper we discuss some of the possible ‘smoking-gun’ evidence of this gas which may have triggered and fuelled the radio source… Expand
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References

SHOWING 1-10 OF 28 REFERENCES
CSSs in a sample of B2 radio sources of intermediate strength
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 observationsExpand
Compact steep-spectrum sources from the S4 sample
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 parametersExpand
The Compact Steep-Spectrum and Gigahertz Peaked-Spectrum Radio Sources
I review the radio to X-ray properties of gigahertz peaked-spectrum (GPS) and compact steep- spectrum (CSS) sources, the current hypotheses for their origin, and their use to constrain the evolutionExpand
Jet Interaction and the Evolution of Compact Symmetric Radio Sources
Readhead et al. have recently proposed that compact symmetric objects (CSOs) evolve into larger double sources many kiloparsecs in extent. They propose a detailed empirical model based on recent VLBIExpand
Large differential Faraday rotation in the compact steep-spectrum quasar 3C 147 and jet–medium interactions
We present multifrequency radio observations of the prototypical compact steep-spectrum quasar 3C 147, and report enormous differential Faraday rotation between the two extended components onExpand
On the evolution of young radio-loud AGN
This paper describes an investigation of the early evolution of extragalactic radio sources using samples of faint and bright gigahertz peaked spectrum (GPS) and compact steep spectrum (CSS) radioExpand
The interpretation of asymmetric depolarization in extragalactic radio sources
We discuss various interpretations of the effect found in powerful double radio sources with one-sided jets whereby the depolarization is systematically stronger on the counter-jet side.Expand
Multi{frequency VLA observations of a new sample of CSS/GPS radio sources
In this paper we present a new sample of 87 Compact Steep Spectrum radio sources (CSS) with flux density0.8 Jy at 0.4 GHz. This sample has been selected from the B3-VLA sample with the aid of new VLAExpand
Collimation of extragalactic radio jets in compact steep-spectrum and larger sources
We study the collimation of radio jets in the high-luminosity Fanaroff–Riley class II sources by examining the dependence of the sizes of hotspots and knots in the radio jets on the overall size ofExpand
Kinematic Age Estimates for Four Compact Symmetric Objects from the Pearson-Readhead Survey
Based on multiepoch observations at 15 and 43 GHz with the Very Long Baseline Array (VLBA), we detect significant angular expansions between the two hot spots of four compact symmetric objectsExpand
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