Evolution of powerful radio source structures: an analytical model

3C286 (1328+307) is a powerful radio source identified with a quasar at z=0.849. There is a foreground galaxy responsible for an H I absorption line system at z=0.6922 (Brown & Roberts 1973), centered approximately 2.″5 to the southeast of 3C286. The radio source has a steep spectrum (α = −0.61, Sv ∝ vα between 1.4 and 15 GHz) which turns over at about 100 MHz. Subarcsecond resolution radio images show a misaligned triple structure, dominated by the central component (Spencer et al. 1989) which accounts for at least 95% of the total flux density at all frequencies. 3C286 is one of the strongest extragalactic sources in polarized emission (0.84 Jy at 5 GHz and 1.41 Jy at 1.4 GHz) and with a rotation measure close to 0 rad m–2 (Rudnick and Jones 1983). Hence the observed orientation of the electric field vector is essentially independent of frequency.

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Radio Source Environments at Redshifts > 0.5

Symposium - International Astronomical Union ◽

10.1017/s0074180900080943 ◽

1996 ◽

Vol 175 ◽

pp. 321-322

Author(s):

M. Lacy ◽

S. Rawlings ◽

M. Wold ◽

A. Bunker ◽

K.M. Blundell ◽

...

Keyword(s):

Radio Source ◽

High Redshift ◽

Elliptical Galaxies ◽

Radio Sources ◽

Powerful Radio ◽

Host Galaxies ◽

Local Universe ◽

Wide Range ◽

Age Of The Universe ◽

The Universe

The most powerful radio sources in the local Universe are found in giant elliptical galaxies. Looking back to a redshift of 0.5 (≈ half the age of the Universe for ω = 1), we see that these host galaxies are increasingly found in moderately rich clusters. This fact gives us hope that radio sources can be used as tracers of high density environments at high redshift. By exploiting radio source samples selected over a wide range in luminosity (Blundell et al., these proceedings), we will also be able to test whether the luminosities of radio sources are correlated with their environments.

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Hosts of Powerful Radio Galaxies in the Near‐Infrared: Implications for Radio Source Evolution

The Astrophysical Journal ◽

10.1086/305963 ◽

1998 ◽

Vol 503 (1) ◽

pp. 156-167 ◽

Cited By ~ 24

Author(s):

W. H. de Vries ◽

C. P. O'Dea ◽

S. A. Baum ◽

E. Perlman ◽

M. D. Lehnert ◽

...

Keyword(s):

Radio Source ◽

Near Infrared ◽

Radio Galaxies ◽

Powerful Radio

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The Emission Line Properties of the 3CR Radio Galaxies at Redshift One: Shocks, Evolution, and the Alignment Effect

Symposium - International Astronomical Union ◽

10.1017/s0074180900162060 ◽

1999 ◽

Vol 194 ◽

pp. 241-245

Author(s):

Philip Best ◽

Huub Röttgering ◽

Malcolm Longair

Keyword(s):

Emission Line ◽

Radio Source ◽

Velocity Structure ◽

Radio Galaxies ◽

Linear Size ◽

Continuum Emission ◽

Radio Sources ◽

Powerful Radio ◽

Alignment Effect ◽

Optical Continuum

The results of a deep spectroscopic campaign on powerful radio galaxies with redshifts z ˜ 1, to investigate in detail their emission line gas properties, are presented. Both the 2-dimensional velocity structure of the [OII] 3727 emission line and the ionisation state of the gas are found to be strongly dependent upon the linear size (age) of the radio source in a manner indicative of the emission line properties of small (young) radio sources being dominated by the passage of the radio source shocks. The consequences of this evolution throughout the few x107 year lifetime of the radio source are discussed, particularly with relation to the alignment of the UV–optical continuum emission of these objects along their radio axis, the nature of which shows similar evolution.

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Radio source evolution from galaxy core to intracluster medium

Proceedings of the International Astronomical Union ◽

10.1017/s1743921315002318 ◽

2014 ◽

Vol 10 (S313) ◽

pp. 271-276

Author(s):

Tamela Maciel ◽

Paul Alexander

Keyword(s):

Radio Source ◽

Galaxy Evolution ◽

Evolutionary Model ◽

Radio Sources ◽

Analytic Model ◽

Powerful Radio ◽

Radiative Model ◽

Self Similar ◽

Analytic Models ◽

Kinetic Mode

AbstractThere is mounting evidence that mechanical kinetic-mode AGN feedback is important in galaxy evolution, and in order to quantify this feedback, detailed models of radio source evolution are required. Self-similar analytic models exist for large powerful radio sources but the evolution of young precursor radio sources is not yet fully understood. In this talk we present a versatile dynamical and radiative model for young source evolution on sub-kiloparsec scales, which extends existing self-similar models into a more complete radio source evolutionary model. This semi-analytic model is successful in reproducing the strong spectral aging observed in compact symmetric objects.

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The Extraordinary Radio Galaxy MRC B1221–423

Publications of the Astronomical Society of Australia ◽

10.1071/as02029 ◽

2003 ◽

Vol 20 (1) ◽

pp. 1-5 ◽

Cited By ~ 6

Author(s):

V. Safouris ◽

R. W. Hunstead ◽

O. R. Prouton

Keyword(s):

Radio Source ◽

Radio Galaxy ◽

Early Stage ◽

Elliptical Galaxy ◽

Empirical Relationship ◽

Host Galaxy ◽

Narrow Line ◽

Powerful Radio ◽

Double Structure ◽

The Core

AbstractMRC B1221–423 is a compact steep spectrum (CSS) radio source in the core of a remarkable elliptical galaxy. We examine its environment with long-slit spectra and multicolour images. A high-resolution synthesis image shows the radio source to have a 1″.5 (5.7 kpc) double structure. We use the empirical relationship between jet kinetic power and narrow line luminosity to infer a source age of ˜105 yr. The z = 0.1706 host galaxy is clearly disturbed, with tidal features and shells providing plausible evidence for a merger with one or more close companions. This evidence leads us to conclude that B1221–423 may be the progenitor of a much larger source, caught at an early stage in its radio evolution. We speculate that it is the interaction and accompanying events which have triggered this young powerful radio source.

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