Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.4210l&link_type=abstract
American Astronomical Society, HEAD meeting #12, #42.10
Astronomy and Astrophysics
Astronomy
Scientific paper
The detection of the Crab pulsar by the VERITAS collaboration is a paradigm-shifting discovery in the high energy studies of neutron stars. It excludes a commonly assumed curvature emission mechanism as the main source of photons above GeV energies.
We outline a model in which both the X-ray emission and the very high energy gamma-ray emission of pulsars originates via the Synchrotron-Self-Compton process by the secondary plasma within the outer gaps. Scattering occurs in the Klein-Nishina regime, favoring the lower energy (in the UV range) tail of the synchrotron photons.
The primary beam is accelerated in a modest electric field, with a value of the order of 0.01 of the magnetic field near the light cylinder; its energy is limited by similar curvature and IC losses.
In such radiation reaction-limited regime of particle acceleration the gamma-ray luminosity scales linearly with the pulsar spin-down power. Overall, in the Klein-Nishina regime of the IC scattering the particle distribution in the gap does not evolve towards a stationary state and thus is intrinsically time-dependent.
Lyutikov Maxim
Otte Nepomuk
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