Abstract
RECENT radio observations of the Crab Nebula1–3 have demonstrated the existence of a component of small angular diameter which contributes a significant fraction of the total flux density at frequencies of less than about 100 Mc/s. The high brightness temperature deduced from the interplanetary scintillation of this source at 38 Mc/s (ref. 3) makes it difficult to attribute this radiation to the synchrotron process, and coherent radio emission from a dense plasma associated with the star has been suggested as a possible mechanism. The previously reported position for the small diameter source based on a lunar occultation observed at 26.5 Mc/s (ref. 2) lies about 1.2′ arc from the centre of the nebula, however, and is well removed from the centre of the observed expansion. The present observations show that the position of this source in the nebula must be much nearer the centre than the earlier measurement suggests.
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