A spatially-independent model that can be used to calculate the temporal evolution of the electron/ positron spectrum in a spherically expanding pulsar wind nebula is presented. The model is applied to the young nebula G21.5-0.9, as well as to the unidentified TeV sources HESS J1427-608 and HESS J1507-622. The parameters derived from the model strengthens the idea that the unidentified sources can be identified as evolved pulsar wind nebulae.
@article{arxiv.1308.1626,
title = {Time-dependent modelling of pulsar wind nebulae},
author = {M. J. Vorster and O. Tibolla and S. E. S. Ferreira and S. Kaufmann},
journal= {arXiv preprint arXiv:1308.1626},
year = {2013}
}