Particle acceleration in the polar cap region of an oscillating neutron star

Details Particle acceleration in the polar cap region of an oscillating neutron star Particle acceleration in the polar cap region of an oscillating neutron star

2011-11-02

arxiv.org/abs/1111.0563v2

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

matches version accepted by Astronomy & Astrophysics

Scientific paper

10.1051/0004-6361/201118380

We revisit particle acceleration in the polar cap region of a neutron star by taking into account both general relativistic effects and the presence of toroidal oscillations at the star surface. In particular, we address the question of whether toroidal oscillations at the stellar surface can affect the acceleration properties in the polar cap. We solve numerically the relativistic electrodynamics equations in the stationary regime, focusing on the computation of the Lorentz factor of a space-charge-limited electron flow accelerated in the polar cap region of a rotating and oscillating pulsar. To this extent, we adopt the correct expression of the general relativistic Goldreich-Julian charge density in the presence of toroidal oscillations. Depending on the ratio of the actual charge density of the pulsar magnetosphere to the Goldreich-Julian charge density, we distinguish two different regimes of the Lorentz factor of the particle flow, namely an oscillatory regime produced for sub-GJ current density configurations, which does not produce an efficient acceleration, and a true accelerating regime for super-GJ current density configurations. We find that star oscillations may be responsible for a significant asymmetry in the pulse profile that depends on the orientation of the oscillations with respect to the pulsar magnetic field. In particular, significant enhancements of the Lorentz factor are produced by stellar oscillations in the super-GJ current density regime.

Affiliated with

Also associated with

No associations

Rating

Particle acceleration in the polar cap region of an oscillating neutron star does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Particle acceleration in the polar cap region of an oscillating neutron star, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Particle acceleration in the polar cap region of an oscillating neutron star will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-329626