scholarly journals A Testable Stochastic Acceleration Model for Flares in Sagittarius A*

2006 ◽  
Vol 648 (2) ◽  
pp. 1020-1025 ◽  
Author(s):  
Siming Liu ◽  
Vahe Petrosian ◽  
Fulvio Melia ◽  
Christopher L. Fryer
Keyword(s):  
Stochastic Acceleration ◽  
Sagittarius A ◽  
Acceleration Model

scholarly journals TIME-DEPENDENT STOCHASTIC ACCELERATION MODEL FOR FERMI BUBBLES

2015 ◽  
Vol 814 (2) ◽  
pp. 93 ◽  
Author(s):  
Kento Sasaki ◽  
Katsuaki Asano ◽  
Toshio Terasawa
Keyword(s):  
Time Dependent ◽  
Stochastic 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.

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