Open AccessEffect of nearby supernova remnants on local cosmic rays
Author(s) -
Thoudam Satyendra
Publication year - 2007
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2007.11705.x
Subject(s) - physics , supernova , cosmic ray , astrophysics , anisotropy , galaxy , diffusion , particle (ecology) , astronomy , optics , geology , oceanography , thermodynamics
We study in detail the effect of different particle release times from sources on the cosmic ray (CR) spectrum below 10 15 eV in the Galaxy. We discuss different possible forms of particle injection such as burst‐like injection, continuous injection for a finite time, injection from a stationary source and energy‐dependent injection. When applied to the nearby known supernova remnants, we find that the observed CR anisotropy data favour the burst‐like particle injection model for the CR diffusion coefficient D ( E ) ∝ E a with a = 0.3 –0.6 in the local region. In this study we have also found that the contribution of the sources G114.3+0.3 and Monogem dominate if the observed anisotropy is a result of the effect of the nearby sources. Further study shows that we should not neglect the contribution of the undetected old sources to the local CR anisotropy.