An Upper Limit to Circularly Polarized Radiation from the Crab Nebula

Details An Upper Limit to Circularly Polarized Radiation from the Crab Nebula An Upper Limit to Circularly Polarized Radiation from the Crab Nebula

Jul 1967

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1967natur.215..493a&link_type=abstract

Nature, Volume 215, Issue 5100, pp. 493-494 (1967).

Computer Science

5

Scientific paper

RECENTLY a small intense source of low frequency radio emission has been detected in the Crab Nebula1,2. Subsequent investigations have revealed that this source has a flux spectral index of a α ~ 1.2 (refs. 2 and 3), an angular diameter of ~ 0.2 sec arc (refs. 3 and 4), and a brightness temperature of ~ 1014 °K (ref. 4). Neither the thermal nor the synchrotron emission mechanisms can satisfactorily account for these characteristics3-5. Accordingly, a plasma mechanism, possibly similar to that of a solar flare, has been proposed4,5. It seems likely that such a mechanism would be associated with the stellar remnant of the supposed supernova which gave rise to the Crab Nebula, and a recent measurement of the position of the compact source indicates that it does indeed coincide with the position of the stellar remnant6.

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