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2014 Fiscal Year Final Research Report

Dynamo mechanism in galaxies: nonlinear dynamics driven by cosmic rays and magnetic fields

Research Project

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Project/Area Number 23540274
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Astronomy
Research InstitutionNational Astronomical Observatory of Japan

Principal Investigator

KUDOH Takahiro  国立天文台, 理論研究部, 助教 (60413952)

Co-Investigator(Renkei-kenkyūsha) YOKOYAMA Takaaki  東京大学, 大学院理学研究科, 准教授 (00311184)
MATUSMOTO Ryoji  千葉大学, 大学院理学研究科, 教授 (00209660)
Research Collaborator KUDOH Yuki  
NASUDA Tetsuya  
MACHIDA Mami  
SUZUKI Akihiro  
Project Period (FY) 2011-04-28 – 2015-03-31
Keywords天文 / 宇宙物理 / 理論天文学 / 流体力学
Outline of Final Research Achievements

The sun belongs to the Galaxy, in which there is interstellar gas between stars. In the interstellar gas, there exist magnetic fields that affect star formation, like the formation of the sun. However, it is not known how the interstellar magnetic fields are maintained. We are interested in the dynamo process that can maintain and amplify the interstellar magnetic fields, and study an important instability in that process. Especially, we focus on the effect of the high-energy particles (cosmic rays) in the interstellar space. We found that the distribution of the gas density and magnetic field dramatically alter in the interstellar space if the cosmic rays contribute to the instability, and confirmed that it will affect the dynamo process.

Free Research Field

天体物理学

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Published: 2016-06-03  

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