Decelerating Blast Waves

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Summary Table
Category Progenitor Type Energy Mechanism Emission Mechanism Counterparts References Brief Comments
LF Radio HF Radio Microwave Terahertz Optical/IR X-rays Gamma-rays Gravitational Waves Neutrinos
Shock Interaction Magnetar Repeat Thin shell Synch. Maser Yes
(excl. self absorption)
Yes -- -- Possible, Prompt Prompt Prompt No No None

Definitions: LF Radio (3 MHz to 3 GHz); HF Radio (3 GHz to 30 GHz); Microwave (30 to 300 GHz)

Model Description

In this model, FRBs like that of FRB 121102 are generated from forward shocks of blast waves decelerating into the previously decelerated waves. An example of these blast waves are flare ejecta from young magnetars.

Observational Constraints

The ejected magnetar material produces a persistent radio source, and a source of high local dispersion measure and high rotation measure. The flares are expected to produce prompt gamma-ray, X-ray and possibly optical flares.

Consistency with Observations

Arecibo telescope and the Robert C. Byrd GreenBank Telescope (GBT) have spent a total of ∼20 hrs observing the remnants of six GRBs (5 long and 1 short) with evidence of having a central magnetar similar to a magnetar that is assumed to powers FRB 121102 (Yunpeng Men et al. 2019). No FRBs were observed from these remnants. The probability of non-detection of FRBs akin to FRB 121102 is 8.9×10−6, which challenges the young magnetar model. The theory is not ruled out though: recent localizations of FRB 180924 (Bannister et al. 2019) and FRB 190523 (Ravi et al. 2019) suggest that the host galaxy of FRB is abnormal for repeating FRBs.