Non-linear diffusion of cosmic rays escaping from supernova remnants – II. Hot ionized media - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Monthly Notices of the Royal Astronomical Society Année : 2019

Non-linear diffusion of cosmic rays escaping from supernova remnants – II. Hot ionized media

L. Nava
V S Ptuskin
  • Fonction : Auteur

Résumé

We study the problem of the escape and transport of cosmic rays (CRs) from a source embedded in a fully ionized, hot phase of the interstellar medium (HIM). In particular, we model the CR escape and their propagation in the source vicinity taking into account excitation of Alfv´enic turbulence by CR streaming and mechanisms damping the self-excited turbulence itself. Our estimates of escape radii and times result in large values (100 pc, 2 × 105 yr) for particle energies ≲ 20 GeV and smaller values for particles with increasing energies (35 pc and 14 kyr at 1 TeV). These escape times and radii, when used as initial conditions for the CR propagation outside the source, result in relevant suppression of the diffusion coefficient (by a factor 5–10) on time-scales comparable with their (energy dependent) escape time-scale. The damping mechanisms are fast enough that even on shorter time-scales, the Alfv´enic turbulence is efficiently damped, and the ratio between random and ordered component of the magnetic field is δB/B0 ≪ 1, justifying the use of quasi-linear theory. In spite of the suppressed diffusion coefficient, and then the increased residence time in the vicinity (≤200 pc) of their source, the grammage accumulated by CRs after their escape is found to be negligible (at all energies) as compared to the one accumulated while diffusing in the whole Galaxy, due to the low density of the HIM.
Fichier principal
Vignette du fichier
Non_linear_CR_diffusion.pdf (355.83 Ko) Télécharger le fichier
Origine : Fichiers produits par l'(les) auteur(s)
Loading...

Dates et versions

hal-02007218 , version 1 (08-02-2019)

Identifiants

Citer

L. Nava, L Recchia, L Gabici, Alexandre Marcowith, L Brahimi, et al.. Non-linear diffusion of cosmic rays escaping from supernova remnants – II. Hot ionized media. Monthly Notices of the Royal Astronomical Society, 2019, 484 (2), pp.2684-2691. ⟨10.1093/mnras/stz137⟩. ⟨hal-02007218⟩
111 Consultations
350 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More