PoS - Proceedings of Science
Volume 301 - 35th International Cosmic Ray Conference (ICRC2017) - Session Cosmic-Ray Indirect. CRI- theory
Supernova remnants in clumpy media: propagation of accelerated particles into clumps
S. Celli,* F. Aharonian, S. Gabici, G. Morlino
*corresponding author
Full text: pdf
Pre-published on: August 30, 2017
Published on: August 03, 2018
Supernova remnant (SNR) shocks are sites of particle acceleration, as indicated by observations
from the radio to the gamma-ray domain. In particular, gamma-rays can be produced as the result
of the interaction between particles accelerated at the SNR shock and the ambient matter and/or
radiation. Both protons and electrons can contribute to the observed gamma-ray emission from
SNRs, through neutral pion decay and inverse Compton scattering, respectively. Ascribing the
origin of the SNR gamma-ray emission to either hadronic or leptonic processes remains, in most
cases, an open problem, and its solution would constitute a crucial step in the quest for cosmic-ray sources. It has been proposed that the presence of dense clumps in the environment where
supernovae explode can have a dramatic impact in shaping the hadronic gamma-ray spectrum.
This is because the high-energy protons accelerated at the SNR shock are able to penetrate the
dense clumps while low-energy ones cannot, and thus probe the diffuse inter-clump medium only.
Here we present a numerical study of the penetration of relativistic protons into clumps which are
engulfed by a SNR shock. We show that the spectrum of protons inside clumps is much harder
than that in the diffuse inter-clump medium, and we discuss the implications for the production
of hadronic gamma-rays.
DOI: https://doi.org/10.22323/1.301.0590
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