Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
T: Fachverband Teilchenphysik
T 37: Cosmic Rays II
T 37.7: Vortrag
Dienstag, 1. April 2025, 17:45–18:00, VG 3.102
Revisiting the theory of diffusive shock acceleration at oblique astrophysical shocks — •Asma Shirin T1,2, Brian Reville2, Nils Schween2, and Florian Schulze2 — 1IISER Tirupati, Tirupati, India — 2MPI-K, Heidelberg, Germany
Astrophysical shocks, for example in supernova remnants, are commonly identified by their non-thermal emission, widely held to be produced by relativistic particles accelerated via the diffusive shock acceleration mechanism. One of the central tenets of the test-particle theory of diffusive shock acceleration is the production of power-law solutions. We demonstrate that in most astrophysical scenarios in which the upstream magnetic field is not aligned with the shock normal, curved spectra are produced even in the test-particle limit.We explore how energy-dependent scattering influences the spectral shape and alters the spectral index, leading to distinct behaviour across different energy regimes. This curvature challenges the long-standing notion that power-law spectra are universal, revealing that they are, in fact, a limiting case rather than a general outcome. These results have profound implications for our understanding of particle acceleration and the interpretation of observational data from cosmic-ray and gamma-ray sources.
Keywords: Diffusive Shock Acceleration; Power-law; Oblique Shocks; Energy-dependent scattering; Curved spectra