scholarly journals SHOCK ACCELERATION MODEL WITH POSTSHOCK TURBULENCE FOR GIANT RADIO RELICS

2017 ◽  
Vol 50 (4) ◽  
pp. 93-103 ◽  
Author(s):  
Hyesung Kang
Keyword(s):  
Shock Acceleration ◽  
Acceleration Model

scholarly journals X-ray and Radio Observations of the Radio Relic Galaxy Clusters 1RXS J0603.3+4214 and RXC J1053.7+5453

Galaxies ◽  
2018 ◽  
Vol 7 (1) ◽  
pp. 2 ◽  
Author(s):  
Motokazu Takizawa
Keyword(s):  
Mach Number ◽  
Galaxy Clusters ◽  
Galaxy Cluster ◽  
Shock Acceleration ◽  
Temperature Structure ◽  
Radio Observations ◽  
Diffusive Shock Acceleration ◽  
X Ray ◽  
Acceleration Model ◽  
The Galaxy

We study two galaxy clusters with radio relics, 1RXS J0603.3+4214 and RXC J1053.7+5453, through X-ray and radio observations. Radio relics are diffuse non-thermal radio sources found in outskirts of galaxy clusters. Because of their shape and location, they are thought to be related to cluster merger shocks. The galaxy cluster 1RXS J0603.3+4214 has a well-known linear-shape “toothbrush” radio relic. We investigate the temperature structure across the relic to constrain the Mach number of the associated shock. The results are compared with radio spectral results, which suggest that a simple diffusive shock acceleration model does not hold for this relic. The RXC J1053.7+5453 harbors a standard arc-like relic. We also get the Mach number from the temperature profile. In addition, we found an edge-like structure in the X-ray image between the X-ray peak and relic. We investigate the density and temperature profiles across the edge and found that the structure is likely relevant to not a shock but a contact discontinuity.

A shock acceleration model for compact accreting sources

1988 ◽  
Vol 8 (2-3) ◽  
pp. 559-561
Author(s):  
Demosthenes Kazanas
Keyword(s):  
Shock Acceleration ◽  
Acceleration Model

scholarly journals Shock Acceleration Model for the Toothbrush Radio Relic

2017 ◽  
Vol 840 (1) ◽  
pp. 42 ◽  
Author(s):  
Hyesung Kang ◽  
Dongsu Ryu ◽  
T. W. Jones
Keyword(s):  
Shock Acceleration ◽  
Acceleration Model

scholarly journals On the Radio Emitting Particles of the Crab Nebula: Stochastic Acceleration Model

2017 ◽  
Vol 13 (S337) ◽  
pp. 259-262
Author(s):  
Shuta J. Tanaka
Keyword(s):  
Crab Nebula ◽  
Supernova Explosion ◽  
Shock Acceleration ◽  
Back Reaction ◽  
Acceleration Process ◽  
Spectral Evolution ◽  
Stochastic Acceleration ◽  
Acceleration Model ◽  
Pulsar Wind ◽  
The Crab Nebula

AbstractThe standard shock acceleration model of pulsar wind nebulae (PWNe) does not account for the hard spectrum in radio wavelengths. The origin of the radio-emitting particles is also important to determine the pair production efficiency in the pulsar magnetosphere. Here, we propose a possible resolution for the particle energy distribution in PWNe; the radio-emitting particles are not accelerated at the pulsar wind termination shock but are stochastically accelerated by turbulence inside PWNe. We upgrade our past one-zone spectral evolution model including the energy diffusion, i.e., the stochastic acceleration, and apply to the Crab Nebula. For a particle injection to the stochastic acceleration process, we consider the continuous injection from the supernova ejecta or the impulsive injection associated with supernova explosion. The observed broadband spectrum and the decay of the radio flux are reproduced by tuning the amount of the particle injected to the stochastic acceleration process. Our results imply that some unveiled mechanisms, such as back reaction to the turbulence, are required to make the energies of stochastically and shock accelerated particles comparable.

scholarly journals Effects of the solar wind termination shock and heliosheath on theheliospheric modulation of galactic and anomalous Helium

2004 ◽  
Vol 22 (8) ◽  
pp. 3063-3072 ◽  
Author(s):  
U. W. Langner ◽  
M. S. Potgieter
Keyword(s):  
Solar Wind ◽  
Cosmic Ray ◽  
Magnetic Polarity ◽  
Termination Shock ◽  
Shock Acceleration ◽  
Diffusive Shock Acceleration ◽  
Cosmic Ray Modulation ◽  
Low Energies ◽  
Solar Wind Termination Shock ◽  
Charge Sign

Abstract. The interest in the role of the solar wind termination shock and heliosheath in cosmic ray modulation studies has increased significantly as the Voyager 1 and 2 spacecraft approach the estimated position of the solar wind termination shock. The effect of the solar wind termination shock on charge-sign dependent modulation, as is experienced by galactic cosmic ray Helium (He++) and anomalous Helium (He+), is the main topic of this work, and is complementary to the previous work on protons, anti-protons, electrons, and positrons. The modulation of galactic and anomalous Helium is studied with a numerical model including a more fundamental and comprehensive set of diffusion coefficients, a solar wind termination shock with diffusive shock acceleration, a heliosheath and particle drifts. The model allows a comparison of modulation with and without a solar wind termination shock and is applicable to a number of cosmic ray species during both magnetic polarity cycles of the Sun. The modulation of Helium, including an anomalous component, is also done to establish charge-sign dependence at low energies. We found that the heliosheath is important for cosmic ray modulation and that its effect on modulation is very similar for protons and Helium. The local Helium interstellar spectrum may not be known at energies

Simulations of Young Type Ia Supernova Remnants Undergoing Shock Acceleration in a Turbulent Medium

2020 ◽  
Vol 891 (1) ◽  
pp. 75 ◽  
Author(s):  
Qiyong Peng ◽  
Biwen Bao ◽  
Chuyuan Yang ◽  
Li Zhang
Keyword(s):  
Supernova Remnants ◽  
Turbulent Medium ◽  
Shock Acceleration ◽  
Type Ia Supernova ◽  
Type Ia
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