Very Large Array imaging of five Fanaroff-Riley II 3CR radio galaxies

Fernini, Ilias; Burns, Jack O.; Bridle, A. H.; Perley, R. A.

doi:10.1086/116547

Cited by 47 publications

(63 citation statements)

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“…However, there is no unambiguous counter-jet in any of these sources. In a similar study of a sample of 13 radio galaxies by Fernini et al (1993Fernini et al ( , 1997, only two have radio jets and neither of these show evidence of any counter jet. Although radio jets are not frequently detected in FRII radio galaxies, two of the good examples of counter-jets seen in FRII radio sources are associated with relatively nearby radio galaxies.…”

Section: Introductionmentioning

confidence: 93%

B1524-136: A CSS quasar with two-sided radio jets

Mantovani

Saikia

Bondì

et al. 2002

A&A

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Abstract. We present MERLIN, global VLBI and VLBA observations of the high-luminosity, compact steepspectrum quasar B1524−136 at cm wavelengths. These observations reveal well-defined radio jets on both sides of the active nucleus, a situation which is almost unique amongst high-luminosity radio quasars. However, the radio jets on opposite sides are very dissimilar, and the overall radio structure appears highly distorted. We discuss possible implications of these observations.

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Section: Introductionmentioning

confidence: 93%

B1524-136: A CSS quasar with two-sided radio jets

Mantovani

Saikia

Bondì

et al. 2002

A&A

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“…FR II sources (l h k 10 kpc, where l h is linear size of radio source) in our sample are selected from FR II radio galaxies in the 3CR catalog (Hardcastle et al 1998;Fernini et al 1993;Bridle et al 1994;Gilbert et al 2004;Kharb et al 2008). MSOs (1 P l h P10 kpc) are selected from the samples in Dallacasa et al (2002aDallacasa et al ( , 2002b.…”

Section: Observational Properties Of Hot Spotsmentioning

confidence: 99%

The Fate of Young Radio Galaxies: Decelerations Inside Host Galaxies?

Kawakatu

Nagai

Kino

2008

Astrophysical Journal

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We examine the evolution of variously sized radio galaxies (i.e., compact symmetric objects [CSOs], medium-size symmetric objects [MSOs], Fanaroff-Riley type II (FR II ) radio galaxies by comparing the relation between the hot spot size and the projected linear size with a coevolution model of hot spots and a cocoon. We take account of the deceleration effect by the cocoon head growth. We find that the advance speed of hot spots and lobes inevitably show the deceleration phase (CSO-MSO phase) and the acceleration phase (MSOYFR II phase). This is ascribed to the change of the power-law index of ambient density profile in the MSO phase ($1 kpc). It is also found that the cocoon shape becomes nearly spherical or disrupted for MSOs, while an elongated morphology is predicted for CSOs and FR II galaxies. This seems to be consistent with the higher fraction of distorted morphology of MSOs than that of CSOs and FR II galaxies. Finally, we predict that only CSOs whose initial advance speed is higher than about 0.1 c can evolve into FR II galaxies, comparing the hot spot speed with the sound speed of the ambient medium.

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“…Their side‐on counterparts are the narrow‐line radio galaxies (NLRG). The ideal comparison sample would consist of NLRG comparable in luminosity and redshift to the quasars observed in Paper 1, but the frequency of detection of jets in these objects in existing observations is very low (Fernini et al 1993, 1997) and we cannot investigate correlations with jet sidedness. By contrast, the detection rate of jets achieved for nearby FRII radio galaxies is high, and we have selected a sub‐sample of these sources with detected jets.…”

Section: Introductionmentioning

confidence: 99%

Asymmetry of jets, lobe size and spectral index in radio galaxies and quasars

Dennett-Thorpe

Bridle

Laing

et al. 1999

Monthly Notices of the Royal Astronomical Society

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In this paper we investigate the correlations between spectral index, jet side and extent of the radio lobes for a sample of nearby FRII radio galaxies. In an earlier paper we studied a sample of quasars and found that the high surface brightness regions had flatter spectra on the jet side (explicable as a result of Doppler beaming) whilst the extended regions had spectral asymmetries dependent on lobe length. Unified schemes predict that asymmetries resulting from beaming will be much smaller in narrow‐line radio galaxies than in quasars, and we therefore chose to investigate, in a similar fashion, a sample of radio galaxies with detected jets. We find that spectral asymmetries in these objects are uncorrelated with jet sidedness at all brightness levels, but depend on relative lobe volume. Our results are not in conflict with unified schemes, but suggest that the differences between the two samples are primarily due to power or redshift, rather than to orientation. We also show directly that hotspot spectra steepen as a function of radio power or redshift. Whilst a shift in observed frequency owing to the redshift may account for some of the steepening, it cannot account for all of it, and a dependence on radio power is required.

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Very Large Array imaging of five Fanaroff-Riley II 3CR radio galaxies

Cited by 47 publications

References 0 publications

B1524-136: A CSS quasar with two-sided radio jets

B1524-136: A CSS quasar with two-sided radio jets

The Fate of Young Radio Galaxies: Decelerations Inside Host Galaxies?

Asymmetry of jets, lobe size and spectral index in radio galaxies and quasars

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