Fossil AGN as UHE Particle Accelerators

Details Fossil AGN as UHE Particle Accelerators Fossil AGN as UHE Particle Accelerators

Jun 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..386..233p&link_type=abstract

Extragalactic Jets: Theory and Observation from Radio to Gamma Ray ASP Conference Series, Vol. 386, proceedings of the conferenc

Astronomy and Astrophysics

Astronomy

Scientific paper

Remnants of AGN jets and their cocoons leave colossal magnetohydrodynamic (MHD) fossil structures storing total energies ˜1060 erg. The original active galactic nucleus (AGN) may be dead but the fossil will retain its stable configuration resembling the reversed-field pinch (RFP) encountered in laboratory MHD experiments.
In an RFP the longitudinal magnetic field changes direction at a critical distance from the axis, leading to magnetic re-connection there, and to slow decay of the large-scale RFP field. We show that this field decay induces large-scale electric fields which can accelerate cosmic rays with an E-2 power-law up to ultra-high energies with a cut-off depending on the fossil parameters.

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