A study of FR II radio galaxies with z &lt; 0.15 -- II. High-resolution maps of 11 sources at 3.6 cm

Leahy, J. P.; Black, A. R. S.; Dennett-Thorpe, J.; Hardcastle, M. J.; Komissarov, S. S.; Perley, R. A.; Riley, J. M.; Scheuer, P. A. G.

doi:10.1093/mnras/291.1.20

Cited by 148 publications

(115 citation statements)

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“…This supports the synchrotron radiation as the origin of the X-ray emission. The EVPA are perpendicular to the highly polarized structures, in agreement with what was found by Leahy et al (1997) at 8.4 GHz, further supporting the presence of strong shocks. It is worth mentioning that the peak of the polarized emission occurs about 0.5 kpc from the peak of the total intensity, in a region where the spectrum is slightly flatter (α ∼0.63) than the spectral index measured in the region of the total intensity peak (α ∼0.69).…”

Section: Discussionsupporting

confidence: 87%

ALMA polarization observations of the particle accelerators in the hotspot of the radio galaxy 3C 445

Orienti

Brunetti

Nagai

et al. 2017

Monthly Notices of the Royal Astronomical Society: Letters

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We present Atacama Large Millimeter Array (ALMA) polarization observations at 97.5 GHz of the southern hot spot of the radio galaxy 3C 445. The hot spot structure is dominated by two bright components enshrouded by diffuse emission. Both components show fractional polarization between 30 and 40 per cent, suggesting the presence of shocks. The polarized emission of the western component has a displacement of about 0.5 kpc outward with respect to the total intensity emission, and may trace the surface of a front shock. Strong polarization is observed in a thin strip marking the ridge of the hot spot structure visible from radio to optical. No significant polarization is detected in the diffuse emission between the main components, suggesting a highly disordered magnetic field likely produced by turbulence and instabilities in the downstream region that may be at the origin of the extended optical emission observed in this hot spot. The polarization properties support a scenario in which a combination of both multiple and intermittent shock fronts due to jet dithering, and spatially distributed stochastic second-order Fermi acceleration processes are present in the hot spot complex.

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Section: Discussionsupporting

confidence: 87%

ALMA polarization observations of the particle accelerators in the hotspot of the radio galaxy 3C 445

Orienti

Brunetti

Nagai

et al. 2017

Monthly Notices of the Royal Astronomical Society: Letters

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“…3C 98: the soft X-ray emission forms a ∼13 narrow structure well aligned with the Northern radio jet (Leahy et al 1997). …”

Section: Notes On Individual Sourcesmentioning

confidence: 93%

Extended soft X-ray emission in 3CR radio galaxies atz< 0.3: high excitation and broad line galaxies

Balmaverde

Capetti

Grandi

et al. 2012

A&A

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We analyze Chandra observations of diffuse soft X-ray emission associated with a complete sample of 3CR radio galaxies at z < 0.3. We focus on the properties of the spectroscopic sub-classes of high excitation galaxies (HEGs) and broad line objects (BLOs). Among the 33 HEGs we detect extended (or possibly extended) emission in about 40% of the sources; the fraction is even higher (8/10) when restricting the analysis to the objects with exposure times larger than 10 ks. In the 18 BLOs, extended emission is seen only in two objects; this lower detection rate can be ascribed to the presence of their bright X-ray nuclei that easily outshine any genuine diffuse emission. A very close correspondence between the soft X-ray and optical line morphology emerges. We also find that the ratio between [O III] and extended soft X-ray luminosity is confined within a factor of 2 around a median value of 5. Both results are similar to what is seen in Seyfert galaxies. We discuss different processes that could explain the soft X-ray emission and conclude that the photoionization of extended gas, coincident with the narrow line region, is the favored mechanism.

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“…There is a general tendency for the inferred magnetic field angle to be perpendicular to the jet direction on entry to the hotspot (e.g. Leahy et al 1997;, possibly because of field compression at the shock. Because the hotspots are often the brightest compact features in sources in which they occur, they would be expected a priori to be good sources of so-called synchrotron selfCompton (SSC) emission, where synchrotron emission provides the seed photons for inverseCompton scattering (Fig.…”

Section: Jet Terminationmentioning

confidence: 99%

Magnetic Fields in Astrophysical Jets: From Launch to Termination

Hardcastle¹,

Gabuzda²

2012

Space Sciences Series of ISSI

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Long-lived, stable jets are observed in a wide variety of systems, from protostars, through Galactic compact objects to active galactic nuclei (AGN). Magnetic fields play a central role in launching, accelerating, and collimating the jets through various media. The termination of jets in molecular clouds or the interstellar medium deposits enormous amounts of mechanical energy and momentum, and their interactions with the external medium, as well, in many cases, as the radiation processes by which they are observed, are intimately connected with the magnetic fields they carry. This review focuses on the properties and structures of magnetic fields in long-lived jets, from their launch from rotating magnetized young stars, black holes, and their accretion discs, to termination and beyond. We compare the results of theory, numerical simulations, and observations of these diverse systems and address similarities and differences between relativistic and non-relativistic jets in protostellar versus AGN systems. On the observational side, we focus primarily on jets driven by AGN because of the strong observational constraints on their magnetic field properties, and we discuss the links between the physics of these jets on all scales.

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A study of FR II radio galaxies with z < 0.15 -- II. High-resolution maps of 11 sources at 3.6 cm

Cited by 148 publications

References 0 publications

ALMA polarization observations of the particle accelerators in the hotspot of the radio galaxy 3C 445

ALMA polarization observations of the particle accelerators in the hotspot of the radio galaxy 3C 445

Extended soft X-ray emission in 3CR radio galaxies atz< 0.3: high excitation and broad line galaxies

Magnetic Fields in Astrophysical Jets: From Launch to Termination

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