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

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 1 PeV cast doubt on this. In the pr...

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Detalles Bibliográficos
Autores principales:	Araudo, Anabella Teresa, Bell, Anthony R., Blundell, Katherine
Formato:	Objeto de conferencia
Lenguaje:	Inglés
Publicado:	2015
Materias:	Ciencias Astronómicas quasar 4C74.26 relativistic shocks cosmic rays
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/167836
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

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spelling	I19-R120-10915-1678362024-07-05T20:02:21Z http://sedici.unlp.edu.ar/handle/10915/167836 Particle acceleration and magnetic field amplification in hotspots of FR II galaxies: the case study 4C74.26 Araudo, Anabella Teresa Bell, Anthony R. Blundell, Katherine 2015-10 2016 2024-07-05T18:27:16Z en Ciencias Astronómicas quasar 4C74.26 relativistic shocks cosmic rays 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 1 PeV cast doubt on this. In the present contribution we model the radio to Xray 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. Facultad de Ciencias Astronómicas y Geofísicas Objeto de conferencia Objeto de conferencia http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) application/pdf 15-22
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Astronómicas quasar 4C74.26 relativistic shocks cosmic rays
spellingShingle	Ciencias Astronómicas quasar 4C74.26 relativistic shocks cosmic rays Araudo, Anabella Teresa Bell, Anthony R. Blundell, Katherine Particle acceleration and magnetic field amplification in hotspots of FR II galaxies: the case study 4C74.26
topic_facet	Ciencias Astronómicas quasar 4C74.26 relativistic shocks cosmic rays
description	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 1 PeV cast doubt on this. In the present contribution we model the radio to Xray 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.
format	Objeto de conferencia Objeto de conferencia
author	Araudo, Anabella Teresa Bell, Anthony R. Blundell, Katherine
author_facet	Araudo, Anabella Teresa Bell, Anthony R. Blundell, Katherine
author_sort	Araudo, Anabella Teresa
title	Particle acceleration and magnetic field amplification in hotspots of FR II galaxies: the case study 4C74.26
title_short	Particle acceleration and magnetic field amplification in hotspots of FR II galaxies: the case study 4C74.26
title_full	Particle acceleration and magnetic field amplification in hotspots of FR II galaxies: the case study 4C74.26
title_fullStr	Particle acceleration and magnetic field amplification in hotspots of FR II galaxies: the case study 4C74.26
title_full_unstemmed	Particle acceleration and magnetic field amplification in hotspots of FR II galaxies: the case study 4C74.26
title_sort	particle acceleration and magnetic field amplification in hotspots of fr ii galaxies: the case study 4c74.26
publishDate	2015
url	http://sedici.unlp.edu.ar/handle/10915/167836
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Particle acceleration and magnetic field amplification in hotspots of FR II galaxies: the case study 4C74.26

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