An optical synchrotron nebula around the X-ray pulsar 0540 693 in the Large Magellanic Cloud

Details An optical synchrotron nebula around the X-ray pulsar 0540 693 in the Large Magellanic Cloud An optical synchrotron nebula around the X-ray pulsar 0540 693 in the Large Magellanic Cloud

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...287l..23c&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 287, Dec. 1, 1984, p. L23-L26. Research supported b

Astronomy and Astrophysics

Astrophysics

40

Magellanic Clouds, Pulsars, Supernova Remnants, Synchrotron Radiation, X Ray Sources, Continuous Radiation, Crab Nebula, Nebulae

Scientific paper

The discovery of extended optical continuum emission around the recently discovered 50 ms X-ray pulsar in the supernova remnant 0540 - 693 is reported. Exposures in blue and red broad-band filters made with the CTIO 4 m telescope and prime focus CCD show a center-brightened but clearly extended nebula about 4 arcsec in diameter (FWHM), while an image in an (O III) filter shows an 8 arcsec diameter shell (as reported earlier) which encloses the continuum source. The extinction-correction magnitudes B = 17.5 and I = 16.4 both correspond to flux densities which lie directly on the extrapolation of the observed X-ray power-law spectrum, suggesting that the emission from 10 to the 14.5 Hz to 10 to the 18th Hz is synchrotron radiation from a single population of particles. Line emission is shown to be only a small contaminant in the broad-band images. Thus the 0540 - 693 system is apparently a very close analog of the Crab Nebula. Any point source component in the former nebula must have B greater than 20; the Crab pulsar at this distance would have B approximately 23. The implications of the observations for the energetics of the pulsar/nebula system are discussed.

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