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- W2735278864 abstract "The role of cosmic rays generated by supernovae and young stars has very recently begun to receive significant attention in studies of galaxy formation and evolution due to the realization that cosmic rays can efficiently accelerate galactic winds. Microscopic cosmic ray transport processes are fundamental for determining the efficiency of cosmic ray wind driving. Previous studies focused on modeling of cosmic ray transport either via constant diffusion coefficient or via streaming proportional to the Alfven speed. However, in predominantly cold, neutral gas, cosmic rays can propagate faster than in the ionized medium and the effective transport can be substantially larger; i.e., cosmic rays can decouple from the gas. We perform three-dimensional magnetohydrodynamical simulations of patches of galactic disks including the effects of cosmic rays. Our simulations include the decoupling of cosmic rays in the cold, neutral interstellar medium. We find that, compared to the ordinary diffusive cosmic ray transport case, accounting for the decoupling leads to significantly different wind properties such as the gas density and temperature, significantly broader spatial distribution of cosmic rays, and larger wind speed. These results have implications for X-ray, gamma-ray and radio emission, and for the magnetization and pollution of the circumgalactic medium by cosmic rays." @default.
- W2735278864 created "2017-07-21" @default.
- W2735278864 creator A5015998400 @default.
- W2735278864 creator A5055048185 @default.
- W2735278864 creator A5062425188 @default.
- W2735278864 creator A5066000762 @default.
- W2735278864 date "2018-03-29" @default.
- W2735278864 modified "2023-09-30" @default.
- W2735278864 title "Impact of Cosmic-Ray Transport on Galactic Winds" @default.
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- W2735278864 doi "https://doi.org/10.3847/1538-4357/aab26d" @default.
- W2735278864 hasPublicationYear "2018" @default.
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