schliessen

Filtern

 

Bibliotheken

Turbulent cosmic ray reacceleration and the curved radio spectrum of the radio relic in the Sausage Cluster

It has often been thought that the northern radio relic in the galaxy cluster CIZA J2242.8+5301 (the “Sausage” Cluster) is associated with cosmic ray (CR) electrons that are accelerated at a shock through the diffusive shock acceleration (DSA) mechanism. However, recent radio observations have shown... Full description

Journal Title: Publications of the Astronomical Society of Japan 2016, Vol. 68(3)
Main Author: Fujita, Yutaka
Other Authors: Akamatsu, Hiroki , Kimura, Shigeo S
Format: Electronic Article Electronic Article
Language:
Subjects:
ID: E-ISSN: 0004-6264 ; DOI: 10.1093/pasj/psw022
Zum Text:
SendSend as email Add to Book BagAdd to Book Bag
Staff View
recordid: oxford10.1093/pasj/psw022
title: Turbulent cosmic ray reacceleration and the curved radio spectrum of the radio relic in the Sausage Cluster
format: Article
creator:
  • Fujita, Yutaka
  • Akamatsu, Hiroki
  • Kimura, Shigeo S
subjects:
  • Cosmic Rays
  • Galaxies: Clusters: Individual (Ciza j2242. 8+5301)
  • Shock Waves
  • Turbulence
ispartof: Publications of the Astronomical Society of Japan, 2016, Vol. 68(3)
description: It has often been thought that the northern radio relic in the galaxy cluster CIZA J2242.8+5301 (the “Sausage” Cluster) is associated with cosmic ray (CR) electrons that are accelerated at a shock through the diffusive shock acceleration (DSA) mechanism. However, recent radio observations have shown that the radio spectrum is curved, which is inconsistent with the prediction of a simple DSA model. Moreover, the CR electron spectrum before being affected by radiative cooling seems to be too hard for DSA. In this study, we show that these facts are natural consequences if the electrons are reaccelerated in turbulence downstream of the shock. In this model, DSA is not the main mechanism for generating high-energy electrons. We find that the mean free path of the electrons should be much shorter than the Coulomb mean free path for efficient reacceleration. The scale of the turbulent eddies must be smaller than the width of the relic. We also predict hard X-ray spectra of inverse Compton scattering of photons.
language:
source:
identifier: E-ISSN: 0004-6264 ; DOI: 10.1093/pasj/psw022
fulltext: fulltext
issn:
  • 0004-6264
  • 00046264
url: Link


@attributes
ID1263894501
RANK0.07
NO1
SEARCH_ENGINEprimo_central_multiple_fe
SEARCH_ENGINE_TYPEPrimo Central Search Engine
LOCALfalse
PrimoNMBib
record
control
sourcerecordid10.1093/pasj/psw022
sourceidoxford
recordidTN_oxford10.1093/pasj/psw022
sourceformatXML
sourcesystemPC
pqid2078333731
display
typearticle
titleTurbulent cosmic ray reacceleration and the curved radio spectrum of the radio relic in the Sausage Cluster
creatorFujita, Yutaka ; Akamatsu, Hiroki ; Kimura, Shigeo S
ispartofPublications of the Astronomical Society of Japan, 2016, Vol. 68(3)
identifierE-ISSN: 0004-6264 ; DOI: 10.1093/pasj/psw022
subjectCosmic Rays ; Galaxies: Clusters: Individual (Ciza j2242. 8+5301) ; Shock Waves ; Turbulence
descriptionIt has often been thought that the northern radio relic in the galaxy cluster CIZA J2242.8+5301 (the “Sausage” Cluster) is associated with cosmic ray (CR) electrons that are accelerated at a shock through the diffusive shock acceleration (DSA) mechanism. However, recent radio observations have shown that the radio spectrum is curved, which is inconsistent with the prediction of a simple DSA model. Moreover, the CR electron spectrum before being affected by radiative cooling seems to be too hard for DSA. In this study, we show that these facts are natural consequences if the electrons are reaccelerated in turbulence downstream of the shock. In this model, DSA is not the main mechanism for generating high-energy electrons. We find that the mean free path of the electrons should be much shorter than the Coulomb mean free path for efficient reacceleration. The scale of the turbulent eddies must be smaller than the width of the relic. We also predict hard X-ray spectra of inverse Compton scattering of photons.
source
version4
lds50peer_reviewed
links
openurl$$Topenurl_article
openurlfulltext$$Topenurlfull_article
search
creatorcontrib
0Fujita, Yutaka
1Akamatsu, Hiroki
2Kimura, Shigeo S
titleTurbulent cosmic ray reacceleration and the curved radio spectrum of the radio relic in the Sausage Cluster
descriptionIt has often been thought that the northern radio relic in the galaxy cluster CIZA J2242.8+5301 (the “Sausage” Cluster) is associated with cosmic ray (CR) electrons that are accelerated at a shock through the diffusive shock acceleration (DSA) mechanism. However, recent radio observations have shown that the radio spectrum is curved, which is inconsistent with the prediction of a simple DSA model. Moreover, the CR electron spectrum before being affected by radiative cooling seems to be too hard for DSA. In this study, we show that these facts are natural consequences if the electrons are reaccelerated in turbulence downstream of the shock. In this model, DSA is not the main mechanism for generating high-energy electrons. We find that the mean free path of the electrons should be much shorter than the Coulomb mean free path for efficient reacceleration. The scale of the turbulent eddies must be smaller than the width of the relic. We also predict hard X-ray spectra of inverse Compton scattering of photons.
subject
0cosmic rays
1galaxies: clusters: individual (CIZA J2242.8+5301)
2shock waves
3turbulence
general
010.1093/pasj/psw022
1Oxford Journals
sourceidoxford
recordidoxford10.1093/pasj/psw022
issn
00004-6264
100046264
rsrctypearticle
creationdate2016
searchscopeoxford
scopeoxford
lsr4020160601
lsr4120160406
lsr30VSR-Enriched:[pqid]
sort
titleTurbulent cosmic ray reacceleration and the curved radio spectrum of the radio relic in the Sausage Cluster
authorFujita, Yutaka ; Akamatsu, Hiroki ; Kimura, Shigeo S
creationdate20160600
facets
frbrgroupid8848279429615228487
frbrtype5
creationdate2016
topic
0Cosmic Rays
1Galaxies: Clusters: Individual (Ciza j2242. 8+5301)
2Shock Waves
3Turbulence
collectionOxford Journals (Oxford University Press)
prefilterarticles
rsrctypearticles
creatorcontrib
0Fujita, Yutaka
1Akamatsu, Hiroki
2Kimura, Shigeo S
jtitlePublications Of The Astronomical Society Of Japan
toplevelpeer_reviewed
delivery
delcategoryRemote Search Resource
fulltextfulltext
addata
aulast
0Fujita
1Akamatsu
2Kimura
aufirst
0Yutaka
1Hiroki
2Shigeo S.
au
0Fujita, Yutaka
1Akamatsu, Hiroki
2Kimura, Shigeo S.
atitleTurbulent cosmic ray reacceleration and the curved radio spectrum of the radio relic in the Sausage Cluster
jtitlePublications of the Astronomical Society of Japan
risdate201606
volume68
issue3
eissn0004-6264
formatjournal
genrearticle
ristypeJOUR
abstractIt has often been thought that the northern radio relic in the galaxy cluster CIZA J2242.8+5301 (the “Sausage” Cluster) is associated with cosmic ray (CR) electrons that are accelerated at a shock through the diffusive shock acceleration (DSA) mechanism. However, recent radio observations have shown that the radio spectrum is curved, which is inconsistent with the prediction of a simple DSA model. Moreover, the CR electron spectrum before being affected by radiative cooling seems to be too hard for DSA. In this study, we show that these facts are natural consequences if the electrons are reaccelerated in turbulence downstream of the shock. In this model, DSA is not the main mechanism for generating high-energy electrons. We find that the mean free path of the electrons should be much shorter than the Coulomb mean free path for efficient reacceleration. The scale of the turbulent eddies must be smaller than the width of the relic. We also predict hard X-ray spectra of inverse Compton scattering of photons.
pubOxford University Press
doi10.1093/pasj/psw022
date2016-06