Magnetically limited X-ray filaments in young SNR

Details Magnetically limited X-ray filaments in young SNR Magnetically limited X-ray filaments in young SNR

2005-02-22

arxiv.org/abs/astro-ph/0502471v1

Astrophys.J. 626 (2005) L101-L104

Astronomy and Astrophysics

Astrophysics

11 pages, 1 figure, submitted to ApJ Letters

Scientific paper

10.1063/1.2141900

We discuss the damping of strong magnetic turbulence downstream of the forward shock of young supernova remnants (SNR). We find that strong magnetic fields, that have been produced by the streaming instability in the upstream region of the shock, or by other kinetic instabilities at the shock, will be efficiently reduced, so the region of enhanced magnetic field strength would typically have a thickness of the order l_d=(10^{16}-10^{17}) cm. The non-thermal X-ray filaments observed in young SNR are thus likely limited by the magnetic field and not by the energy losses of the radiating electrons. Consequently the thickness of the filaments would not be a measure of the magnetic field strength and claims of efficient cosmic-ray acceleration on account of a run-away streaming instability appear premature.

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