# Radio Emission from Pulsar Wind Nebulae without Surrounding Supernova Ejecta: Application to FRB 121102

## TL;DR

This paper proposes a model where a pulsar without supernova ejecta creates repeating FRBs and a persistent radio source through a pulsar wind nebula, explaining observations of FRB 121102.

## Contribution

It introduces a novel scenario of FRB production via a pulsar wind nebula without surrounding supernova ejecta, aligning with observed properties of FRB 121102.

## Key findings

- The model explains the persistent radio source associated with FRB 121102.
- The scenario is consistent with the non-evolving dispersion measure over four years.
- Synchrotron emission from the PWN can account for observed radio brightness.

## Abstract

In this paper, we propose a new scenario in which a rapidly-rotating strongly-magnetized pulsar without any surrounding supernova ejecta produces fast radio bursts (FRBs) repeatedly via some mechanisms, and meanwhile, an ultra-relativistic electron/positron pair wind from the pulsar sweeps up its ambient dense interstellar medium, giving rise to a non-relativistic pulsar wind nebula (PWN). We show that the synchrotron radio emission from such a PWN is bright enough to account for the recently-discovered persistent radio source associated with the repeating FRB 121102 in reasonable ranges of the model parameters. In addition, our PWN scenario is consistent with the non-evolution of the dispersion measure inferred from all the repeating bursts observed in four years.