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Дата изменения: Unknown Дата индексирования: Tue Oct 2 14:20:51 2012 Кодировка: Поисковые слова: http www.stecf.org conferences eslab2007 |
The Pulsar / Supernova Remnant Connection
B. M. Gaensler and Simon Johnston, RCfTA
Abstract. Despite over 25 years of debate, it is still unclear what fraction of supernovae form pulsars. The question of associations between pulsars and shell-type supernova remnants is re-examined in the light of the many associations claimed in the last few years. We develop a simple model for the luminosity evolution of shell supernova remnants, and quantify the selection effects associated with their detection. In combination with existing models for pulsar evolution and detection we perform Monte Carlo simulations and compare our results with the known sample of supernova remnants. We find that even if every supernova forms a fast-spinning pulsar, the number of shell type remnants which are expected to have an associated pulsar is even less than observed. As a consequence, we conclude that some claimed associations are merely geometric projection.
headings: Supernova Remants:general, Pulsars:general, Supernovae:general, Surveys, ISM:structure
simonj@physics.usyd.edu.au