On generation of Crab giant pulses

Abstract

We propose that Crab giant pulses are generated on closed magnetic field lines near the light cylinder via anomalous cyclotron resonance on the ordinary mode. Waves are generated in a set of fine, unequally spaced, narrow emission bands at frequencies much lower than a local cyclotron frequency. Location of emission bands is fitted to spectral structures seen by Eilek et al. (2006). To reproduce the data, the required density of plasma in the giant pulses emission region is much higher, by a factor $\sim 3\times 10^5$, than the minimal Goldreich-Julian density. Emission is generated by a population of highly energetic particles with radiation-limited Lorentz factors $\gamma \sim 7\times 10^7$, produced during occasional reconnection close to the Y point, where the last closed field lines approach the light cylinder.

accepted by MNRAS; added estimate of simultaneous GLAST signal

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• The Crab Pulsar at Centimeter Wavelengths: I. Ensemble Characteristics
• A Giant Sample of Giant Pulses from the Crab Pulsar
• Coherent emission in pulsars, magnetars and Fast Radio Bursts: reconnection-driven free electron laser
• Giant Pulses with Nanosecond Time Resolution detected from the Crab Pulsar at 8.5 and 15.1 GHz
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• Hitomi X-ray studies of Giant Radio Pulses from the Crab pulsar
• Search for a correlation between very-high-energy gamma rays and giant radio pulses in the Crab pulsar
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• Fallback onto Kicked Neutron Stars and its Effect on Spin-Kick Alignment
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• Retuning radio astronomy for axion dark matter with neutron stars