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22대 대한민국 국회 국회정보길라잡이 국회의원검색
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Title Page

Abstract

Contents

1. Introduction 8

2. Numerical Setup 10

2-1. Particle in Cell Simulation 10

2-2. Tristan-MP 11

2-3. PIC parameters 13

2-4. Periodic Boundary Test and Specific boundary conditions 15

3. Result 18

3-1. Self-excited Magnetic field 18

3-2. Phase space distribution 21

3-3. Energy Spectrum 23

3-4. Wave Analysis 26

3-5. Discussion 32

4. Summary 33

Reference 35

초록보기

 Radio relics detected in the outskirts of galaxy clusters provide direct evidence of Diffusive Shock Acceleration (DSA) in the hot intracluster medium (ICM). These relics typically exhibit sonic Mach numbers (Ms) less than 4. Recent studies suggest that the pre-acceleration and injection of electrons may occur only at supercritical shocks with Ms greater than 2.3 in high-beta environments in the ICM. However, some observed radio relics display subcritical shocks with Ms less than 2.3, contradicting previous simulation results. One plausible explanation for this inconsistency is the presence of a non-uniform shock surface characterized by varying Ms and obliquity angles. To explore DSA at such weak shocks, we conducted Particle-in-Cell (PIC) simulations using a sinusoidal plasma beam profile to generate a turbulent shock surface with variable obliquity angles. This thesis presents some of the first results from these simulations and shows how they compare to single Mach number shocks in a uniform background. It also discusses what these results mean for the idea that subcritical shocks could generate radio relics.

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