Electron acceleration at rippled low-mach-number shocks in high-beta collisionless cosmic plasmas

2021
journal article
article
15
dc.abstract.enUsing large-scale fully kinetic two-dimensional particle-in-cell simulations, we investigate the effects of shock rippling on electron acceleration at low-Mach-number shocks propagating in high-β plasmas, in application to merger shocks in galaxy clusters. We find that the electron-acceleration rate increases considerably when the rippling modes appear. The main acceleration mechanism is stochastic shock-drift acceleration, in which electrons are confined at the shock by pitch-angle scattering off turbulence and gain energy from the motional electric field. The presence of multiscale magnetic turbulence at the shock transition and the region immediately behind the main shock overshoot is essential for electron energization. Wide-energy non-thermal electron distributions are formed both upstream and downstream of the shock. The maximum energy of the electrons is sufficient for their injection into diffusive shock acceleration. We show for the first time that the downstream electron spectrum has a power-law form with index p ≈ 2.5, in agreement with observations.pl
dc.affiliationWydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomicznepl
dc.contributor.authorKobzar, Oleh - 428622 pl
dc.contributor.authorNiemiec, Jacekpl
dc.contributor.authorAmano, Takanobupl
dc.contributor.authorHoshino, Masahiropl
dc.contributor.authorMatsukiyo, Shuichipl
dc.contributor.authorMatsumoto, Yosukepl
dc.contributor.authorPohl, Martinpl
dc.date.accessioned2024-03-08T12:11:32Z
dc.date.available2024-03-08T12:11:32Z
dc.date.issued2021pl
dc.date.openaccess0
dc.description.accesstimew momencie opublikowania
dc.description.number2pl
dc.description.versionostateczna wersja wydawcy
dc.description.volume919pl
dc.identifier.articleid97pl
dc.identifier.doi10.3847/1538-4357/ac1107pl
dc.identifier.eissn1538-4357pl
dc.identifier.issn0004-637Xpl
dc.identifier.urihttps://ruj.uj.edu.pl/xmlui/handle/item/327764
dc.languageengpl
dc.language.containerengpl
dc.rightsDodaję tylko opis bibliograficzny*
dc.rights.licenceOTHER
dc.rights.uri*
dc.share.typeotwarte czasopismo
dc.subtypeArticlepl
dc.titleElectron acceleration at rippled low-mach-number shocks in high-beta collisionless cosmic plasmaspl
dc.title.journalThe Astrophysical Journalpl
dc.typeJournalArticlepl
dspace.entity.typePublication
dc.abstract.enpl
Using large-scale fully kinetic two-dimensional particle-in-cell simulations, we investigate the effects of shock rippling on electron acceleration at low-Mach-number shocks propagating in high-β plasmas, in application to merger shocks in galaxy clusters. We find that the electron-acceleration rate increases considerably when the rippling modes appear. The main acceleration mechanism is stochastic shock-drift acceleration, in which electrons are confined at the shock by pitch-angle scattering off turbulence and gain energy from the motional electric field. The presence of multiscale magnetic turbulence at the shock transition and the region immediately behind the main shock overshoot is essential for electron energization. Wide-energy non-thermal electron distributions are formed both upstream and downstream of the shock. The maximum energy of the electrons is sufficient for their injection into diffusive shock acceleration. We show for the first time that the downstream electron spectrum has a power-law form with index p ≈ 2.5, in agreement with observations.
dc.affiliationpl
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut – Obserwatorium Astronomiczne
dc.contributor.authorpl
Kobzar, Oleh - 428622
dc.contributor.authorpl
Niemiec, Jacek
dc.contributor.authorpl
Amano, Takanobu
dc.contributor.authorpl
Hoshino, Masahiro
dc.contributor.authorpl
Matsukiyo, Shuichi
dc.contributor.authorpl
Matsumoto, Yosuke
dc.contributor.authorpl
Pohl, Martin
dc.date.accessioned
2024-03-08T12:11:32Z
dc.date.available
2024-03-08T12:11:32Z
dc.date.issuedpl
2021
dc.date.openaccess
0
dc.description.accesstime
w momencie opublikowania
dc.description.numberpl
2
dc.description.version
ostateczna wersja wydawcy
dc.description.volumepl
919
dc.identifier.articleidpl
97
dc.identifier.doipl
10.3847/1538-4357/ac1107
dc.identifier.eissnpl
1538-4357
dc.identifier.issnpl
0004-637X
dc.identifier.uri
https://ruj.uj.edu.pl/xmlui/handle/item/327764
dc.languagepl
eng
dc.language.containerpl
eng
dc.rights*
Dodaję tylko opis bibliograficzny
dc.rights.licence
OTHER
dc.rights.uri*
dc.share.type
otwarte czasopismo
dc.subtypepl
Article
dc.titlepl
Electron acceleration at rippled low-mach-number shocks in high-beta collisionless cosmic plasmas
dc.title.journalpl
The Astrophysical Journal
dc.typepl
JournalArticle
dspace.entity.type
Publication

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