Coherent curvature radiation: maximum luminosity and high-energy emission

Abstract

High brightness temperature radio transients such as pulsars and fast radio bursts require the coherent radiation of particles. The antenna class of coherent radiation models require a large number of charged particles radiating in phase, therefore the particles must be spatially confined and have well-aligned velocities. Given these necessary conditions, we look at the magnetic field induced by the currents associated with coherently emitting accelerated particles and consider the interaction between the radiating particles and the induced magnetic field. We find a maximum luminosity of coherent curvature radiation that depends on source parameters such as surface magnetic field and neutron star spin period. We find that coherent radio emission across all luminosities can be explained by coherent curvature radiation and suggest it could be universally responsible for both FRBs and extreme galactic sources. Using the Crab Pulsar as an example, we constrain the emission parameters and origin of the most extreme nanoshots to within 60km of the pulsar surface assuming coherent curvature radiation. In agreement with recent observations, we also predict simultaneous X-ray emission from small-scale particle gyration due to the induced field.

Accepted to MNRAS Letters

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• Polarisation of magnetospheric curvature radiation in repeating fast radio bursts
• An extremely active repeating fast radio burst source in a likely non-magneto-ionic environment
• Pulsar revival in neutron star mergers: multi-messenger prospects for the discovery of pre-merger coherent radio emission
• Birth and Evolution of Fast Radio Bursts: Strong Population-Based Evidence for a Neutron-Star Origin
• The Statistical Polarization Properties of Coherent Curvature Radiation by Bunches: Application to Fast Radio Burst Repeaters
• Narrow spectra of repeating fast radio bursts: A magnetospheric origin
• The plasma suppression effect can be ignored in realistic FRB models invoking bunched coherent radio emission
• Propagation of Alfvén waves in the charge starvation regime
• On the energy budget of starquake-induced repeating fast radio bursts
• Testing afterglow models of FRB 200428 with early post-burst observations of SGR 1935+2154
• Coherent Curvature Radiation Spectrum by Dynamically Fluctuating Bunches in Magnetospheres
• Contemporaneous optical-radio observations of a fast radio burst in a close galaxy pair
• A targeted search for FRB counterparts with Konus-Wind
• Periodic Activities of Fast Radio Burst Repeaters from Precessing Magnetars with Evolving Obliquity
• The Impact of Accretion on FRB Radiation Mechanisms in Binary Systems: Constraints and Implications