Tracing the origin of low diffusivity and CR bubbles around sources

Benedikt Schroer; Oreste Pezzi; Damiano Caprioli; Colby Haggerty; Pasquale Blasi

doi:10.22323/1.395.0163

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Tracing the origin of low diffusivity and CR bubbles around sources

Conference proceeding

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Tracing the origin of low diffusivity and CR bubbles around sources

Benedikt Schroer, Oreste Pezzi, Damiano Caprioli, Colby Haggerty and Pasquale Blasi

37TH INTERNATIONAL COSMIC RAY CONFERENCE, ICRC2021, 163

01/01/2022

DOI: 10.22323/1.395.0163

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Abstract

Cosmic rays leave their sources mainly along the local magnetic field present in the region around the source and in doing so they excite both resonant and non-resonant modes through streaming instabilities. The excitation of these modes leads to enhanced particle scattering and in turn to a large pressure gradient that causes the formation of expanding bubbles of gas and self-generated magnetic fields. By means of hybrid particle-in-cell simulations, we demonstrate that, by exciting this instability, cosmic rays excavate a cavity around their source where the diffusivity is strongly suppressed. This phenomenon is general and is expected to occur around any sufficiently powerful cosmic ray source in the Galaxy. Our results are consistent with recent W-ray observations where emission from the region around supernova remnants and stellar clusters have been used to infer that the diffusion coefficient around these sources is similar to 10 100 times smaller than the typical Galactic one.

Physical Sciences

Physics

Astronomy & Astrophysics

Physics, Particles & Fields

Science & Technology

Details

Title: Subtitle: Tracing the origin of low diffusivity and CR bubbles around sources
Creators: Benedikt Schroer - Gran Sasso Sci Inst, Viale F Crispi 7, I-67100 Laquila, Italy
Oreste Pezzi - Gran Sasso Sci Inst, Viale F Crispi 7, I-67100 Laquila, Italy
Damiano Caprioli - University of Chicago
Colby Haggerty - University of Chicago
Pasquale Blasi - Gran Sasso Sci Inst, Viale F Crispi 7, I-67100 Laquila, Italy
Contributors: B Keilhauer (Editor)
Resource Type: Conference proceeding
Publication Details: 37TH INTERNATIONAL COSMIC RAY CONFERENCE, ICRC2021, 163
DOI: 10.22323/1.395.0163
Publisher: SISSA Medialab
Number of pages: 8
Grant note: NNX17AG30G; 80NSSC18K1218; 80NSSC20K1273; 80NSSC18K1726 / NASA; National Aeronautics & Space Administration (NASA) AST-1714658; AST-2009326; AST-1909778; PHY-1748958; PHY-2010240 / NSF; National Science Foundation (NSF)
Language: English
Date published: 01/01/2022
Academic Unit: Physics and Astronomy
Record Identifier: 9985224314902771

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