Journal article

Particle acceleration and magnetic field amplification in hotspots of FR II galaxies: The case study 4C74.26

Abstract:: It has been suggested that relativistic shocks in extragalactic sources may accelerate the most energetic cosmic rays. However, recent theoretical advances indicating that relativistic shocks are probably unable to accelerate particles to energies much larger than a PeV cast doubt on this. In the present contribution we model the radio to X-ray emission in the southern hotspot of the quasar 4C74.26. The synchrotron radio emission is resolved near the shock with the MERLIN radio-interferometer, and the rapid decay of this emission behind the shock is interpreted as the decay of the downstream magnetic field as expected for small scale turbulence. If our result is confirmed by analyses of other radiogalaxies, it provides firm observational evidence that relativistic shocks at the termination region of powerful jets in FR II radiogalaxies do not accelerate ultra high energy cosmic rays.

Publication status:: Published

Peer review status:: Peer reviewed

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APA Style

Araudo, A., Bell, A., & Blundell, K. (2016). Particle acceleration and magnetic field amplification in hotspots of FR II galaxies: The case study 4C74.26.

MLA Style

Araudo, A., et al. Particle Acceleration and Magnetic Field Amplification in Hotspots of FR II Galaxies: The Case Study 4C74.26. Argentinian Astronomical Society, 2016.

Chicago Style

Araudo, A, A Bell, and K Blundell. 2016. “Particle Acceleration and Magnetic Field Amplification in Hotspots of FR II Galaxies: The Case Study 4C74.26.”
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Authors

+ Araudo, A More by this author

Institution:: University of Oxford
Division:: MPLS
Department:: Physics
Sub department:: Astrophysics
Role:: Author

+ Bell, A More by this author

Institution:: University of Oxford
Division:: MPLS
Department:: Physics
Sub department:: Atomic & Laser Physics
Role:: Author

+ Blundell, K More by this author

Institution:: University of Oxford
Division:: MPLS
Department:: Physics
Sub department:: Astrophysics
Role:: Author

+ Science and Technology Facilities Council More from this funder

Grant:: ST/K00106X/1

+ Seventh Framework Programme More from this funder

Grant:: 247039

Publisher:: Argentinian Astronomical Society
Publication date:: 2016-02-25

Pubs id:: pubs:606640
UUID:: uuid:83f249d3-e792-427e-ac42-1ee3dbf9a305
Local pid:: pubs:606640
Source identifiers:: 606640
Deposit date:: 2016-02-29

Terms of use

Copyright date:: 2016

Licence:: Terms and Conditions of Use for Oxford University Research Archive

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