Particle Acceleration in a Shock Wave Propagating to an Inhomogeneous Medium
We investigate effects of upstream density fluctuations on the diffusive shock acceleration (DSA) by Monte Carlo simulations. The simulations show that particles are reaccelerated in the shock downstream region by a sound wave generated at the shock front. The timescale of turbulent acceleration by...
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| Published in | The Astrophysical journal Vol. 897; no. 1; pp. 50 - 55 |
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| Main Authors | , |
| Format | Journal Article |
| Language | English |
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The American Astronomical Society
01.07.2020
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| Abstract | We investigate effects of upstream density fluctuations on the diffusive shock acceleration (DSA) by Monte Carlo simulations. The simulations show that particles are reaccelerated in the shock downstream region by a sound wave generated at the shock front. The timescale of turbulent acceleration by the sound wave is estimated. We propose a new back reaction of particles accelerated around the shock front. The accelerated particles generate the upstream density fluctuations by the Drury instability, which are converted to the downstream sound waves by the shock. The downstream sound waves modify the momentum spectrum of particles accelerated around the shock front. This new back reaction affects emission from the accelerated particles, which gives a new constraint on the acceleration efficiency of the DSA. |
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| AbstractList | We investigate effects of upstream density fluctuations on the diffusive shock acceleration (DSA) by Monte Carlo simulations. The simulations show that particles are reaccelerated in the shock downstream region by a sound wave generated at the shock front. The timescale of turbulent acceleration by the sound wave is estimated. We propose a new back reaction of particles accelerated around the shock front. The accelerated particles generate the upstream density fluctuations by the Drury instability, which are converted to the downstream sound waves by the shock. The downstream sound waves modify the momentum spectrum of particles accelerated around the shock front. This new back reaction affects emission from the accelerated particles, which gives a new constraint on the acceleration efficiency of the DSA. Abstract We investigate effects of upstream density fluctuations on the diffusive shock acceleration (DSA) by Monte Carlo simulations. The simulations show that particles are reaccelerated in the shock downstream region by a sound wave generated at the shock front. The timescale of turbulent acceleration by the sound wave is estimated. We propose a new back reaction of particles accelerated around the shock front. The accelerated particles generate the upstream density fluctuations by the Drury instability, which are converted to the downstream sound waves by the shock. The downstream sound waves modify the momentum spectrum of particles accelerated around the shock front. This new back reaction affects emission from the accelerated particles, which gives a new constraint on the acceleration efficiency of the DSA. |
| Author | Ohira, Yutaka Yokoyama, Shota L. |
| Author_xml | – sequence: 1 givenname: Shota L. orcidid: 0000-0002-3743-414X surname: Yokoyama fullname: Yokoyama, Shota L. organization: The University of Tokyo Department of Earth and Planetary Science, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan – sequence: 2 givenname: Yutaka orcidid: 0000-0002-2387-0151 surname: Ohira fullname: Ohira, Yutaka organization: The University of Tokyo Department of Earth and Planetary Science, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan |
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| Snippet | We investigate effects of upstream density fluctuations on the diffusive shock acceleration (DSA) by Monte Carlo simulations. The simulations show that... Abstract We investigate effects of upstream density fluctuations on the diffusive shock acceleration (DSA) by Monte Carlo simulations. The simulations show... |
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| SubjectTerms | Astrophysics Computer simulation Cosmic rays Density Fluctuations Inhomogeneous media Monte Carlo simulation Particle acceleration Particle astrophysics Shock wave propagation Shock waves Shocks Sound waves Supernova remnants Upstream |
| Title | Particle Acceleration in a Shock Wave Propagating to an Inhomogeneous Medium |
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