Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982natur.300..155w&link_type=abstract
Nature, vol. 300, Nov. 11, 1982, p. 155-157.
Astronomy and Astrophysics
Astronomy
31
Crab Nebula, Pulsars, Radio Sources (Astronomy), Stellar Envelopes, Supernova Remnants, Astronomical Models, Brightness Distribution, Nonthermal Radiation, Stellar Evolution
Scientific paper
A search at radio wavelengths for the hypothetical outer shell of the Crab Nebula is reported, and no shell has been detected. It is indicated that such a shell is fainter than expected for the surface brightness-linear diameter relation for shell type supernova remnants. Alternative explanations for the optical shell include emission from the hypothetical remnant shell, light scattered off dust grains from the surrounding nebula, and the leakage of synchrotron emitting electrons from the nebula. It is also noted that because of the nonspherical shape of the halo, a Stromgren sphere ionized by the nonthermal UV synchrotron radiation of the nebula is implausible. In addition, in order to prove the emission theory, it is suggested that high velocity gas in the halo must be detected through optical spectroscopy. Finally, further X-ray observations may be useful in order to confirm and map a possible soft X-ray halo peripheral to the nebula, but this halo is probably a result of X-ray scattering.
Weiler Kurt W.
Wilson Andrew S.
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