# Pulsar Wind Nebulae

## TL;DR

This paper provides a comprehensive overview of pulsar wind nebulae, highlighting how multi-wavelength observations reveal their structure, evolution, and the energetic processes driven by pulsars.

## Contribution

It offers a broad synthesis of observational evidence across the electromagnetic spectrum to understand the composition, dynamics, and evolution of pulsar wind nebulae.

## Key findings

- Detection of jets and wind termination shocks
- Observation of time-varying emission structures
- Insights into the long-term evolution of energetic particles

## Abstract

The extended nebulae formed as pulsar winds expand into their surroundings provide information about the composition of the winds, the injection history from the host pulsar, and the material into which the nebulae are expanding. Observations from across the electromagnetic spectrum provide constraints on the evolution of the nebulae, the density and composition of the surrounding ejecta, the geometry of the central engines, and the long-term fate of the energetic particles produced in these systems. Such observations reveal the presence of jets and wind termination shocks, time-varying compact emission structures, shocked supernova ejecta, and newly formed dust. Here I provide a broad overview of the structure of pulsar wind nebulae, with specific examples from observations extending from the radio band to very high energy gamma-rays that demonstrate our ability to constrain the history and ultimate fate of the energy released in the spin-down of young pulsars.