Stochastic Acceleration in the Western Hotspot of Pictor A

Details Stochastic Acceleration in the Western Hotspot of Pictor A Stochastic Acceleration in the Western Hotspot of Pictor A

2007-11-29

arxiv.org/abs/0711.4794v2

Astronomy and Astrophysics

Astrophysics

12 pages, 2 figures. Accepted by ApJ Letters

Scientific paper

10.1086/528372

Chandra's high resolution observations of radio galaxies require a revisit of the relevant electron acceleration processes. Although the diffusive shock particle acceleration model may explain spectra of spatially unresolved sources, it encounters difficulties in explaining the structure and spectral properties of recently discovered Chandra X-ray features in several low-power radio sources. We argue that these observations strongly suggest stochastic electron acceleration by magnetized turbulence, and show that the simplest stochastic particle acceleration model with energy independent acceleration and escape timescales can overcome most of these difficulties. We use the bright core of the western hotspot of Pictor A as an example to demonstrate the model characteristics, which may be tested with high energy observations.

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