Time-dependent escape of cosmic rays from supernova remnants, and their interaction with dense media
作者： I. Telezhinsky , V. V. Dwarkadas , M. Pohl
DOI: 10.1051/0004-6361/201118639
关键词: Cosmic ray 、 Molecular cloud 、 Physics 、 Context (language use) 、 Particle acceleration 、 Spectral line 、 Astrophysics 、 Pion 、 Supernova 、 Galaxy
摘要: Context. Supernova remnants (SNRs) are thought to be the main source of Galactic cosmic rays (CRs) up “knee” in CR spectrum. During evolution a SNR, bulk CRs confined inside SNR shell. The highest-energy particles leave system continuously, while remaining adiabatically cooled released when has expanded sufficiently and decelerated so that magnetic field at shock is no longer able confine them. Particles escaping from parent may interact with nearby molecular clouds, producing γ-rays process via pion decay. soft gamma-ray spectra observed for number SNRs interacting however, challenge current theories non-linear particle acceleration predict harder spectra. Aims. We study how spectrum escaped depends on time-dependent history both Type Ia corecollapse SNRs, as well different assumptions about diffusion coefficient vicinity SNR. Methods. solve transport equation test-particle approach combined numerical simulations evolution. Results. extend our method calculating trace large volume around SNRs. calculate have into cloud or dense shell two models. find strong confinement close region dilution effect were propagate out far few radii.
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sci-hub.st 参考文章(78)
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