X-ray Line Diagnostics of Ion Temperature at Cosmic-Ray Accelerating Collisionless Shocks
arXiv:2201.07607 · doi:10.1093/pasj/psac053
Abstract
A novel collisionless shock jump condition is suggested by modeling the entropy production at the shock transition region. We also calculate downstream developments of the atomic ionization balance and the ion temperature relaxation in supernova remnants (SNRs). The injection process and subsequent acceleration of cosmic-rays (CRs) in the SNR shocks are closely related to the formation process of the collisionless shocks. The formation of the shock is caused by wave-particle interactions. Since the wave-particle interactions result in energy exchanges between electromagnetic fields and charged particles, the randomization of particles associated with the shock transition may occur with the rate given by the scalar product of the electric field and current. We find that order-of-magnitude estimates of the randomization with reasonable strength of the electromagnetic fields in the SNR constrain the amount of the CR nuclei and ion temperatures. The constrained amount of the CR nuclei can be sufficient to explain the Galactic CRs. The ion temperature becomes significantly lower than in the case of no CRs. To distinguish the case without CRs, we perform synthetic observations of atomic line emissions from the downstream region of the SNR RCW~86. Future observations by {\it XRISM} and {\it Athena} can distinguish whether the SNR shock accelerates the CRs or not from the ion temperatures.
18 pages, 14 figures, 3 tables, accepted for publication in PASJ
References in corpus (18)
- Measuring the cosmic ray acceleration efficiency of a supernova remnant
- Electron Surfing and Drift Accelerations in a Weibel-dominated High-Mach-number Shock
- Kinetic Simulations of Cosmic-Ray-Modified Shocks II: Particle Spectra
- The many sides of RCW 86: a type Ia supernova remnant evolving in its progenitor's wind bubble
- Large Metallicity Variations in the Galactic Interstellar Medium
- Collisionless shock heating of heavy ions in SN 1987A
- The Heating of Thermal Electrons in Fast Collisionless Shocks: The Integral Role of Cosmic Rays
- On cosmic-ray production efficiency at supernova remnant shocks propagating into realistic diffuse interstellar medium
- Oblique Ion Two-Stream Instability in the Foot Region of a Collisionless Shock
- Absence of Electron Surfing Acceleration in a Two-Dimensional Simulation
- Pursuing the origin of the gamma rays in RX J1713.73946 quantifying the hadronic and leptonic components
- Detailed Design of the Science Operations for the XRISM mission
- Electron-ion Recombination of Fe XII forming Fe XI: Laboratory Measurements and Theoretical Calculations
- Electron Heating, Magnetic Field Amplification, and Cosmic Ray Precursor Length at Supernova Remnant Shocks
- A Systematic Study of the Thermal and Nonthermal Emission in the Supernova Remnant RCW 86 with Suzaku
- Polarized Balmer Line Emission from Supernova Remnant Shock Waves Efficiently Accelerating Cosmic Rays
- Radiative transfer of hydrogen lines from supernova remnant shock waves: contributions of 2s-state hydrogen atoms
- The Effects of Cosmic-Ray Diffusion and Radiative Cooling on the Galactic Wind from the Milky Way