Vol 18, No 6 (2018) / Li

A model of fast radio bursts: collisions between episodic magnetic blobs

Long-Biao Li, Yong-Feng Huang, Jin-Jun Geng, Bing Li

Abstract

Fast radio bursts (FRBs) are bright radio pulses from the sky with millisecond durations and Jansky-level flux densities. Their origins are still largely uncertain. Here we suggest a new model for FRBs. We argue that the collision of a white dwarf with a black hole can generate a transient accretion disk, from which powerful episodic magnetic blobs will be launched. The collision between two consecutive magnetic blobs can result in a catastrophic magnetic reconnection, which releases a large amount of free magnetic energy and forms a forward shock. The shock propagates through the cold magnetized plasma within the blob in the collision region, radiating through the synchrotron maser mechanism, which is responsible for a non-repeating FRB signal. Our calculations show that the theoretical energetics, radiation frequency, duration timescale and event rate can be very consistent with the observational characteristics of FRBs.

Keywords


accretion — accretion disks — magnetic reconnection — radio continuum: general

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DOI: https://doi.org/10.1088/1674–4527/18/6/61

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