English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Spectrally resolved cosmic ray hydrodynamics – I. Spectral scheme

Girichidis, P., Pfrommer, C., Hanasz, M., & Naab, T. (2019). Spectrally resolved cosmic ray hydrodynamics – I. Spectral scheme. Monthly Notices of the Royal Astronomical Society, 491(1), 993-1007. doi:10.1093/mnras/stz2961.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0005-C428-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0005-C42B-E
Genre: Journal Article

Files

show Files
hide Files
:
Spectrally resolved cosmic ray hydrodynamics – I. Spectral scheme.pdf (Any fulltext), 2MB
 
File Permalink:
-
Name:
Spectrally resolved cosmic ray hydrodynamics – I. Spectral scheme.pdf
Description:
-
Visibility:
Private
MIME-Type / Checksum:
application/pdf
Technical Metadata:
Copyright Date:
-
Copyright Info:
-
License:
-

Locators

show

Creators

show
hide
 Creators:
Girichidis, Philipp, Author
Pfrommer, Christoph, Author
Hanasz, Michał, Author
Naab, Thorsten1, Author              
Affiliations:
1Computational Structure Formation, MPI for Astrophysics, Max Planck Society, ou_2205642              

Content

show
hide
Free keywords: -
 Abstract: Cosmic ray (CR) protons are an important component in many astrophysical systems. Processes like CR injection, cooling, adiabatic changes as well as active CR transport through the medium strongly modify the CR momentum distribution and have to be taken into account in hydrodynamical simulations. We present an efficient novel numerical scheme to accurately compute the evolution of the particle distribution function by solving the Fokker–Planck equation with a low number of spectral bins (10–20), which is required to include a full spectrum for every computational fluid element. The distribution function is represented by piecewise power laws and is not forced to be continuous, which enables an optimal representation of the spectrum. The Fokker–Planck equation is solved with a two-moment approach evolving the CR number and energy density. The low numerical diffusion of the scheme reduces the numerical errors by orders of magnitude in comparison to classical schemes with piecewise constant spectral representations. With this method not only the spectral evolution of CRs can be computed accurately in magnetohydrodynamic simulations but also their dynamical impact as well as CR ionization. This allows for more accurate models for astrophysical plasmas, like the interstellar medium, and direct comparisons with observations.

Details

show
hide
Language(s):
 Dates: 2019-11-07
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stz2961
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Monthly Notices of the Royal Astronomical Society
  Other :
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: OXFORD : OXFORD UNIV PRESS
Pages: - Volume / Issue: 491 (1) Sequence Number: - Start / End Page: 993 - 1007 Identifier: ISSN: 0035-8711
CoNE: https://pure.mpg.de/cone/journals/resource/1000000000021470