Temporal 1/fα Fluctuations from Fractal Magnetic Fields in Black-Hole Accretion Flow

Publications of the Astronomical Society of Japan

Matsumoto, Ryoji²  Shibata, Kazunari³  Kawaguchi, Toshihiro¹  Mineshige, Shin¹  Machida, Mami² 

[1] Department of Astronomy, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502 E-mail (TK):;Department of Physics, Chiba University, Inage-ku, Chiba, Chiba 263-8522;Kwasan Observatory, Kyoto University, Yamashina-ku, Kyoto 607-8471

关键词: "accretion;    accretion disks";    "black hole physics";    fractal;    magnetohydrodynamics;    "1/f fluctuations";   

DOI  :  10.1093/pasj/52.1.L1

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Rapidfluctuationwithafrequencydependenceof1/fα(withα≃1–2)ischaracteristicofradiationfromblack-holeobjects.Itsoriginremainspoorlyunderstood.Weexaminedthree-dimensionalmagnetohydrodynamicalsimulationdata,findingthatamagnetizedaccretiondiskexhibitsboth1/fαfluctuation(withα≃2)andafractalmagneticstructure(withthefractaldimensionofD∼1.9).Thefractalfieldconfigurationleadstoreconnectioneventswithavarietyofreleasedenergyandduration,therebyproducing1/fαfluctuations.

【 授权许可】

Unknown