On particle acceleration and very high energy -ray emission in Crab-like pulsars
Jun, 2009Citations per year
Abstract: (arXiv)
The origin of very energetic charged particles and the production of very high-energy (VHE) gamma-ray emission remains still a challenging issue in modern pulsar physics. By applying a toy model, we explore the acceleration of co-rotating charged particles close to the light surface in a plasma-rich pulsar magnetosphere and study their interactions with magnetic and photon fields under conditions appropriate for Crab-type pulsars. Centrifugal acceleration of particles in a monopol-like magnetic field geometry is analyzed and the efficiency constraints, imposed by corotation, inverse Compton interactions and curvature radiation reaction are determined. We derive expressions for the maximum particle energy and provide estimates for the corresponding high-energy curvature and inverse Compton power outputs. It is shown that for Crab-like pulsars, electron Lorentz factor up to can be achieved, allowing inverse Compton (Klein-Nishina) up-scattering of thermal photons to TeV energies with a maximum luminosity output of erg/s. Curvature radiation, on the other hand, will result in a strong GeV emission output of up to erg/s, quasi-exponentially decreasing towards higher energies for photon energies below GeV. Accordingly to the results presented only young pulsars are expected to be sites of detectable VHE -ray emission.Note:
- 6 pages, 1 figure
- Pulsars
- Acceleration of particles
- emission processes
- particle: acceleration
- gamma ray: VHE
- pulsar
- curvature
- radiation
- magnetic field
- efficiency
References(50)
Figures(1)