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Astron. Astrophys. 325, 295-299

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Non Crab-like Plerions?

L. Woltjer1, M. Salvati2, F. Pacini2,3, and R. Bandiera2

1Observatoire de Haute Provence, F-04870 St. Michel l'Observatoire, France
2Osservatorio Astrofisico di Arcetri, L. E.Fermi 5, I-50125 Firenze, Italy
3Dipartimento di Astronomia e Scienza dello Spazio, Università di Firenze, L. E.Fermi 5, I-50125 Firenze, Italy

Received 6 December 1996 / Accepted 17 March 1997


Several plerionic Supernova Remnants have spectral properties different from the Crab Nebula and do not show the presence of a central observable pulsar. We discuss in particular the cases of CTB87 and 3C58, and show that their properties cannot be fitted in the canonical scenario; a non-standard evolution of the pulsar output seems to be required.

Key words: ISM: supernova remnants - pulsars: general - acceleration of particles

Send offprint requests to: M. Salvati

© European Southern Observatory (ESO) 1997