VLA observation of radio/optical knots in 3C 277.3 = Coma A

Bridle, A. H.; Fomalont, E. B.; Palimaka, J. J.; Willis, A.

doi:10.1086/159174

Cited by 10 publications

(9 citation statements)

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“…Coma A (3C 277.3) is a twin-lobed radio galaxy at redshift z = 0.0857 [6]. This AGN shows an unusual jet structure with a bright hotspot in the northern lobe and a deflected jet and knots in the southern lobe.…”

Section: Coma Amentioning

confidence: 99%

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Evidence for Toroidal B-Field Components in AGN Jets on Kiloparsec Scales

2017

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Though helical magnetic fields are generally believed to arise when the jets of Active Galactic Nuclei (AGN) are launched, it is still unclear what role they play (and if they survive) to the largest jet scales. A helical or toroidal B-field may contribute substantially to the collimation of the jet. This B-field structure can be detected in images of the Faraday rotation measure (RM)-a measure of the change in polarisation angle of an electromagnetic wave as it passes through a magneto-ionic medium. The Faraday rotation measure is directly proportional to the line-of-sight magnetic field; therefore a monotonic gradient in the RM transverse to the jet indicates similar behaviour of the line-of-sight B-field component. This type of analysis has mostly been done on parsec scales using VLBI observations at centimetre wavelengths, while relatively few studies have probed decaparsec to kiloparsec scales. The detection of RM gradients with significances of 3σ or more on such large scales can demonstrate the presence of a toroidal field component, which may be associated with a helical field that has persisted to these distances from the centre of the AGN. We present the results of new Faraday rotation analyses for 2 AGN on kiloparsec scales based on multiwavelength VLA observations, with robust transverse RM gradients detected in both. Furthermore, the direction of the inferred toroidal B-fields on the sky supports previous results indicating a predominance of outward currents in the jets on kiloparsec scales.

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Section: Coma Amentioning

confidence: 99%

“…This AGN shows an unusual jet structure with a bright hotspot in the northern lobe and a deflected jet and knots in the southern lobe. The morphology of the jets is discussed in detail in [6,7]. Observations from 1-2 GHz using the NRAO Karl Jansky Very Large Array (JVLA) were analysed.…”

Section: Coma Amentioning

confidence: 99%

Evidence for Toroidal B-Field Components in AGN Jets on Kiloparsec Scales

2017

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“…shows the overall structure and prominent components of the radio source. The source has well-rounded diffuse lobes, a prominent northern (N) hotspot, and two bright southern knots which are labelled K1 and K2, following Bridle et al (1981).…”

Section: Vla Radiomentioning

confidence: 99%

X-rays associated with the jet–cloud-interacting radio galaxy 3C 277.3 (Coma A): implications for energy deposition

Worrall

Birkinshaw

Young

2016

Mon. Not. R. Astron. Soc.

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We report the discovery with Chandra of X-ray-emitting gas associated with the jet-cloud interaction in the radio galaxy 3C 277.3 (Coma A), a source that falls in the most important power range for radio-mode feedback in the Universe. This hot gas, heated by the jet, dominates the mass of the cloud which is responsible for an extreme projected deflection of the kpc-scale radio jet. Highly absorbed X-ray emission from the nucleus of 3C 277.3 confirms that the jet lies close to the plane of the sky and so has a large intrinsic deflection. We detect group gas on the scale of the radio lobes, and see X-ray cavities coincident with the brightest radio emission, with the lobes embraced by X-ray enhancements that we argue are the result of shocks. The anti-correlation between the locations of X-ray arms and Hα-emitting filaments that are believed to have originated from a merger with one or more gas-rich galaxies suggests that shocks advancing around the lobe are inhibited by the dense colder material. Synchrotron X-ray emission is detected from the upstream edge of a second bright radio knot. X-rays are also detected from the location where an undetected counterjet enters the northern radio hotspot. We suggest that these X-rays are synchrotron radiation from a shock in a small-scale substructure.

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“…(183,184,256,278). Jets with low (<5~) polarization at centimeter wavelengths (31,47) are exceptional. High degrees of polarization imply ordering of the component of the jet magnetic field Bj perpendicular to the line of sight, but this order need not be three dimensional (137).…”

Section: Magnetic Configurationmentioning

confidence: 99%