Temporal 1/f^αFluctuations from Fractal Magnetic Fields in Black Hole Accretion Flow

Abstract

Rapid fluctuation with a frequency dependence of $1/f^{\alpha }$ (with $\alpha \simeq 1-2$) is characteristic of radiation from black-hole objects. Its origin remains poorly understood. We examine the three-dimensional magnetohydrodynamical (MHD) simulation data, finding that a magnetized accretion disk exhibits both $1/f^{\alpha }$ fluctuation (with $\alpha \simeq 2$) and a fractal magnetic structure (with the fractal dimension of $D\sim 1.9$). The fractal field configuration leads reconnection events with a variety of released energy and of duration, thereby producing $1/f^{\alpha }$ fluctuations.

5 pages, 4 figures. Accepted for publication in PASJ Letters, vol. 52 No.1 (Feb 2000)

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