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

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

[学科分类] 天文学(综合)

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