Free electron laser in magnetars/Fast Radio Bursts

Abstract

We discuss coherent free electron laser (FEL) operating during explosive reconnection events in magnetized pair plasma of magnetar magnetospheres. The model explains many salient features of Fast Radio Bursts/magnetars' radio emission: temporal coincidence of radio and high energy bursts, high efficiency of conversion of plasma kinetic energy into coherent radiation, presence of variable, narrow-band emission features drifting down in frequency, high degree of linear polarization. The model relies on magnetar-specific drifting $e^{\pm }$ plasma components (which generate wiggler field due to the development of the firehose instability) and the presence of reconnection-generated particle beam with mild Lorentz factor of ${\gamma }_b\sim$ few hundred.

References in corpus (5)

• CHIME/FRB Detection of the Original Repeating Fast Radio Burst Source FRB 121102
• Millisecond extragalactic radio bursts as magnetar flares
• An X-Ray Burst from a Magnetar Enlightening the Mechanism of Fast Radio Bursts
• Fast Radio Bursts from reconnection events in magnetar magnetospheres
• Coherence constraints on physical parameters at bright radio sources and FRB emission mechanism

Cited by in corpus (3)

• Millisecond Magnetars
• Rotating neutron stars without light cylinders
• Multi-Wavelength Constraints on the Outflow Properties of the Extremely Bright Millisecond Radio Bursts from the Galactic Magnetar SGR 1935+2154