Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...291..152r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 291, April 1, 1985, p. 152-155.
Astronomy and Astrophysics
Astrophysics
24
Crab Nebula, Magellanic Clouds, Pulsars, Stellar Evolution, Supernova Remnants, X Ray Sources, Radio Emission, Relativistic Plasmas, Stellar Mass Ejection, Stellar Rotation, Synchrotron Radiation
Scientific paper
The radio, optical, and X-ray observations of the Crablike supernova remnant in the Large Magellanic Cloud, 0540-69.3, and its newly discovered 50 ms X-ray pulsar, are reviewed. Simple evolutionary considerations restrict the age of the object to the range 800-1100 yr. The appearance of the object in all frequency bands can be understood if it is a combination of emission resulting from several solar masses of fast-moving (about 10,000 km/s) material interacting with the surrounding medium, producing the radio emission, and 0.2-2 solar masses of processed material which has been swept into a shell and accelerated by the pulsar. The magnetic field in the relativistic bubble responsible for the observed optical and X-ray synchrotron emission is 0.0007-0.0011 G. The original rotational energy is inferred to be 1.5-4.2 x 10 to the 49th ergs, depending only insensitively on model details; this implies an initial period for the pulsar of 30 + or - 8 ms. This is the second reliable determination of a pulsar's initial period.
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