AbstractThe supernova remnant N 157B contains a pulsar and three distinct synchrotron components with rather unusual properties. (1) A somewhat irregular elliptical pulsar wind nebula (PWN) visible in both X-ray and radio wavelengths. The nebula is quite symmetrical with an extent of about 10×5 parsecs but offset along the long axis by about 4 pc from the pulsar position. It is apparently the result of a short-lived injection of energetic particles, perhaps starting at the time of explosion. (2) A very bright X-ray shock region located just outside the pulsar position in the edge of the PWN. This is undetected in the radio. We attribute this to a new burst of particles from the pulsar suggesting there are multiple episodes rather than continuous injection. (3) The beginning of a radio synchrotron shell on the southern side of the SNR where thermal X-rays appear to arise suggesting that N 157B is starting to become a composite SNR.
Non-thermal X-ray and radio emission from the SNR N 157B
Advances in Space Research ; 33 , 4 ; 446-449
2003-08-19
4 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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