Journal article
Kinetic Simulations of Cosmic-Ray-modified Shocks. II. Particle Spectra
The Astrophysical journal, Vol.905(1), p.2
12/01/2020
DOI: 10.3847/1538-4357/abbe05
Abstract
Diffusive shock acceleration is a prominent mechanism for producing energetic particles in space and in astrophysical systems. Such energetic particles have long been predicted to affect the hydrodynamic structure of the shock, in turn leading to CR spectra flatter than the test-particle prediction. However, in this work along with a companion paper, we use self-consistent hybrid (kinetic ion-fluid electron) simulations to show for the first time how CR-modified shocks actually produce steeper spectra. The steepening is driven by the enhanced advection of CRs embedded in magnetic turbulence downstream of the shock, in what we call the "postcursor." These results are consistent with multiwavelength observations of supernovae and supernova remnants and have significant phenomenological implications for space/astrophysical shocks in general.
Details
- Title: Subtitle
- Kinetic Simulations of Cosmic-Ray-modified Shocks. II. Particle Spectra
- Creators
- Damiano Caprioli - University of ChicagoColby C. Haggerty - University of ChicagoPasquale Blasi - Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali del Gran Sasso
- Resource Type
- Journal article
- Publication Details
- The Astrophysical journal, Vol.905(1), p.2
- DOI
- 10.3847/1538-4357/abbe05
- ISSN
- 0004-637X
- eISSN
- 1538-4357
- Publisher
- The American Astronomical Society
- Number of pages
- 8
- Grant note
- NNX17AG30G / National Aeronautics and Space Administration (NASA) (https://doi.org/10.13039/100000104) 80NSSC18K1726 / National Aeronautics and Space Administration (NASA) (https://doi.org/10.13039/100000104) AST-1714658 / National Science Foundation (NSF) (https://doi.org/10.13039/100000001) PHY-1748958 / National Science Foundation (NSF) (https://doi.org/10.13039/100000001) PHY-2010240 / National Science Foundation (NSF) (https://doi.org/10.13039/100000001) 80NSSC18K1218 / National Aeronautics and Space Administration (NASA) (https://doi.org/10.13039/100000104) AST-1909778 / National Science Foundation (NSF) (https://doi.org/10.13039/100000001)
- Alternative title
- Kinetic Simulations of Cosmic-Ray-modified Shocks. II. Particle Spectra
- Language
- English
- Date published
- 12/01/2020
- Academic Unit
- Physics and Astronomy
- Record Identifier
- 9985224320302771
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