Particle Acceleration Controlled by Ambient Density in the Southwestern Rim of RCW 86

Abstract The physics of particle acceleration at supernova remnant (SNR) shocks is one the most intriguing problems in astrophysics. SNR RCW 86 provides a suitable environment for understanding because can extract information on both accelerated particles and same regions through bright X-ray emission. In this work, we study proper motions spectral properties southwestern region 86. motion velocities are found to be ∼300–2000 km s −1 distance 2.8 kpc. We find two inward-moving filaments, which more likely reflected rather than reverse shocks. Based spectroscopy, evaluate thermal parameters such as ambient density temperature, nonthermal power-law flux index. From decrease over time several estimate magnetic field amplitudes ∼30–100 μ G. Gathering physical parameters, then investigate parameter correlations. that synchrotron emission from thermal-dominated filaments correlated with n e (power-law flux) ∝ n e 1.0 ± 0.2 index) {n}_{{\rm{e}}}^{0.38\pm 0.10}$?> 0.38 0.10 , not or only weakly shock velocity obliquity. As an interpretation, propose shock–cloud interaction scenario, where locally enhanced turbulence levels have great influence local conditions.