Temporal 1/fα fluctuations from fractal magnetic fields in black-hole accretion flow

Toshihiro Kawaguchi, Shin Mineshige, Mami Machida, Ryoji Matsumoto, Kazunari Shibata

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Abstract

Rapid fluctuation with a frequency dependence of 1/fα (with α ≃ 1-2) is characteristic of radiation from black-hole objects. Its origin remains poorly understood. We examined three-dimensional magnetohydrodynamical simulation data, finding that a magnetized accretion disk exhibits both 1/fα fluctuation (with α ≃ 2) and a fractal magnetic structure (with the fractal dimension of D ∼ 1.9). The fractal field configuration leads to reconnection events with a variety of released energy and duration, thereby producing 1/fα fluctuations.

Original languageEnglish
Pages (from-to)L1-L4
JournalPublications of the Astronomical Society of Japan
Volume52
Issue number1
DOIs
Publication statusPublished - Jan 1 2000
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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