Dynamical Effects of Cosmic Rays on the Medium Surrounding Their Sources

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

doi:10.3847/2041-8213/ac02cd

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Dynamical Effects of Cosmic Rays on the Medium Surrounding Their Sources

Journal article

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Dynamical Effects of Cosmic Rays on the Medium Surrounding Their Sources

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

Astrophysical journal. Letters, Vol.914(1), p.L13

06/01/2021

DOI: 10.3847/2041-8213/ac02cd

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Abstract

Cosmic rays (CRs) leave their sources mainly along the local magnetic field; in doing so they excite both resonant and nonresonant modes through streaming instabilities. The excitation of these modes leads to enhanced scattering and in turn to a large pressure gradient that causes the formation of bubbles of gas, CRs, and self-generated magnetic fields expanding into the interstellar medium. By means of hybrid particle-in-cell simulations, we show that, by exciting the nonresonant instability, CRs excavate a cavity around their source where the diffusivity is strongly suppressed. This finding invalidates the so far largely adopted flux-tube assumption, under which particles move along magnetic lines even in the nonlinear regime. This phenomenon is general and is expected to occur around any sufficiently powerful CR source in the Galaxy. Our results might provide a physical explanation of the numerous claims of suppressed CR diffusion around Galactic sources such as supernova remnants, pulsar wind nebulae, and stellar clusters.

Astronomy & Astrophysics

Physical Sciences

Science & Technology

Details

Title: Subtitle: Dynamical Effects of Cosmic Rays on the Medium Surrounding Their Sources
Creators: Benedikt Schroer - Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
Oreste Pezzi - Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
Damiano Caprioli - Fermi National Accelerator Laboratory
Colby Haggerty - University of Hawaii System
Pasquale Blasi - Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
Resource Type: Journal article
Publication Details: Astrophysical journal. Letters, Vol.914(1), p.L13
DOI: 10.3847/2041-8213/ac02cd
ISSN: 2041-8205
eISSN: 2041-8213
Publisher: IOP Publishing Ltd
Number of pages: 5
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) TG-AST180008 / NASA High-End Computing Program through the NASA Advanced Supercomputing Division at Ames Research Center, and XSEDE TACC
Language: English
Date published: 06/01/2021
Academic Unit: Physics and Astronomy
Record Identifier: 9985224417702771

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