论文标题
Crescendo：一种用于宇宙模拟中光谱宇宙射线的flly-Fokker-Planck求解器
CRESCENDO: An on-the-fly Fokker-Planck Solver for Spectral Cosmic Rays in Cosmological Simulations
论文作者
论文摘要
相对论宇宙射线（CR）电子发射的非热发射可深入了解群集内磁场的强度和形态，并提供结构构成冲击的强大示踪剂。另一方面，由CR质子引起的排放仍然挑战当前的观察结果，因此正在测试集群内冲击下质子加速的模型。大规模的模拟包括CR的影响很难实现，并且主要减少以模拟整体能量预算，或者在模拟输出后进行过程中追踪CR种群，并且经常为质子或电子进行。我们介绍了渐进式射线：宇宙电子和质子的宇宙射线演化，这是一种有效的在仿真元素中的有效的fokker-Planck求解器，以进化Cr质子和电子的分布。基于最近的PIC模拟，绝热变化和电子的辐射损失的结果，该求解器在集群内冲击处考虑了CR（重新）加速。我们在测试用例以及理想化的星系群（GC）模拟中显示了其性能。我们将模型应用于CIZA J2242.4+5301-1的最佳拟合参数和研究CR注射，无线电遗物形态，光谱陡峭和同步器发射的最佳拟合参数。
Non-thermal emission from relativistic Cosmic Ray (CR) electrons gives insight into the strength and morphology of intra-cluster magnetic fields, as well as providing powerful tracers of structure formation shocks. Emission caused by CR protons on the other hand still challenges current observations and is therefore testing models of proton acceleration at intra-cluster shocks. Large-scale simulations including the effects of CRs have been difficult to achieve and have been mainly reduced to simulating an overall energy budget, or tracing CR populations in post-processing of simulation output and has often been done for either protons or electrons. We introduce CRESCENDO: Cosmic Ray Evolution with SpeCtral Electrons aND prOtons, an efficient on-the-fly Fokker-Planck solver to evolve distributions of CR protons and electrons within every resolution element of our simulation. The solver accounts for CR (re-)acceleration at intra-cluster shocks, based on results of recent PIC simulations, adiabatic changes and radiative losses of electrons. We show its performance in test cases as well as idealized galaxy cluster (GC) simulations. We apply the model to an idealized GC merger following best-fit parameters for CIZA J2242.4+5301-1 and study CR injection, radio relic morphology, spectral steepening and synchrotron emission.
