Jet termination in wide-angle tail radio sources

Hardcastle, M. J.; Sakelliou, I.

doi:10.1111/j.1365-2966.2004.07522.x

Cited by 49 publications

(110 citation statements)

References 45 publications

(82 reference statements)

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“…The length of the deceleration region depends on the total power of the source, and ranges from ∼2 kpc for luminosities <10 24 W Hz −1 at 1.4 GHz to ∼10 kpc for the stronger sources. The flaring points have also been observed in WAT objects (Hardcastle & Sakelliou 2004) and are described as hotspot-like features similar to those visible in FR IIs.…”

Section: Discussionmentioning

confidence: 58%

“…They lie closer to the radio core than the hotspots from the FR II side and possess steep spectra. Both the FR I and FR II parts of the hybrid objects show bends and disruption of the radio structure similar to those observed in the WAT objects (Hardcastle & Sakelliou 2004). We speculate that the bright compact features visible on the FR I side in our hybrid objects could be regions of transition to FR I morphology, which originally started as FR IIs.…”

Section: Discussionmentioning

confidence: 80%

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Orientation of the cores of hybrid morphology radio sources

Ceglowski

Gawroński

Kunert-Bajraszewska

2013

A&A

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Aims. The FR I/FR II dichotomy is a much debated issue in the astrophysics of extragalactic radio sources. Study of the properties of HYbrid MOrphology Radio Sources (HYMORS) may bring crucial information and lead to a step forward in understanding the origin of FR I/FR II dichotomy. HYMORS are a rare class of double-lobed radio sources where each of the two lobes clearly exhibits a different FR morphology. This article describes follow-up high resolution VLBA observations of the five discovered by us HYMORS. The main aim of the observations was to answer the questions of whether the unusual radio morphology is connected to the orientation of objects towards the observer. Methods. The milliarcsecond-scale structures are good probes of the galactic medium, the possible asymmetries, and orientation of the central engines of the sources. We obtained the high resolution radio maps of five hybrid radio morphology objects with the VLBA at C-band and L-band. Results. The cores of all five sources have been detected at both radio bands. Two of them revealed milliarcsecond core-jet structures, the next two objects showed hints of parsec-scale jets, and the last one remained point-like at both frequencies. Conclusions. We compared properties of observed milliarcsecond structures of hybrid sources with the larger scale ones previously detected with the VLA. We find that on both scales the fluxes of their central components are similar, which may indicate the lack of additional emission in the proximity of the nucleus. This suggests that jets present on the ∼1−10 kpc scale in those objects are FR II-like. When possible, the detected core-jet structures were used for estimating the core's spatial orientation. The result is that neither the FR I-like nor the FR II-like side is preferred, which may suggest that no specific spatial orientation of HYMORS is required to explain their radio morphology. Their estimated viewing angles indicate they are unbeamed objects. The 178/151 MHz luminosity of observed HYMORS exceed the traditional FR I/FR II break luminosity, indicating they have radio powers similar to FR IIs.

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Section: Discussionmentioning

confidence: 58%

Section: Discussionmentioning

confidence: 80%

Orientation of the cores of hybrid morphology radio sources

Ceglowski

Gawroński

Kunert-Bajraszewska

2013

A&A

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“…In another scenario, the plumes form as the radio lobes of moderately powerful twin-jets are driven outwards due to buoyancy forces (Hardcastle 1999). The latter model is motivated by the observations that the jet in some WATs continue well into the plume (e.g., Hardcastle 1999;Hardcastle & Sakelliou 2004).…”

Section: Origin Of the Watmentioning

confidence: 99%

“…Hardcastle & Sakelliou (2004) have shown that the distance between the host galaxy and the base of the plume inversely correlate with the cluster richness as quantified in terms of the temperature of the ICM (also, Jetha et al 2006). Since WATs reside at or close to gravitational centres of clusters and groups of galaxies, these can also be used as a signpost for the cluster or group of galaxies.…”

Section: Introductionmentioning

confidence: 99%

“…Burns 1981;Eilek et al 1984;Leahy 1984;O'Dea & Owen 1985;O'Donoghue et al 1990). Since neither the bending of the radio plumes occurs universally, nor is the bending of jet essential for its flaring and plume formation, jet bending is currently regarded as a phenomenon independent from jet flaring (Hardcastle & Sakelliou 2004;Hardcastle, Sakelliou & Worrall 2005).…”

Section: Introductionmentioning

confidence: 99%

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GMRT detection of a New Wide-Angle Tail (WAT) radio source associated with the galaxy PGC 1519010

2009

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Abstract.We report the serendipitous detection of a Wide-Angle-Tail (WAT) radio galaxy at 240 and 610 MHz, using the Giant Metrewave Radio Telescope (GMRT). This WAT is hosted by a cD galaxy PGC 1519010 whose photometric redshift given in the SDSS DR6 catalog is close to the spectroscopic redshifts (0.105, 0.106 and 0.107) of three galaxies found within 4 ′ of the cD. Using the SDSS DR6 we have identified a total of 37 galaxies within 15 ′ of the cD, whose photometric redshifts are between 0.08 and 0.14. This strongly suggests that the cD is associated with a group of galaxies whose conspicuous feature is a north-south chain of galaxies (filament) extending to at least 2.6 Mpc. The ROSAT All-Sky Survey shows a faint, diffuse X-ray source in this direction, which probably marks the hot intra-cluster gas in the potential well of this group.We combine the radio structural information for this WAT with the galaxy clustering in that region to check its overall consistency with the models of WAT formation. The bending of the jet before and after its disruption forming the radio plume, are found to be correlated in this WAT, as seen from the contrasting morphological patterns on the two sides of the core. Probable constraints imposed by this on the models of WAT formation are pointed out. We also briefly report on the other interesting radio sources found in the proximity of the WAT. These include a highly asymmetric double radio source and an ultra-steep spectrum radio source for which no optical counterpart is detected in the SDSS.

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