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Discovery of a 65 Millisecond Pulsar in the Supernova Remnant G11.22–0.3 with ASCA

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Ken'ichi Torii1, Hiroshi Tsunemi1,2, Tadayasu Dotani3 and Kazuhisa Mitsuda3

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We report here the discovery of a 65 ms X-ray pulsar in the supernova remnant G11.2-0.3 with ASCA. The object is known to be a composite supernova remnant that shows both an extended shell component and a compact plerionic component. We have detected a sinusoidal pulsation with an amplitude of ~19% in the hard X-ray band (3-10 keV). The object has been proposed to be the historical remnant of the supernova of A.D. 386, which makes it the second candidate for the secure association of a pulsar and a historical supernova after the Crab Nebula and its pulsar.


Subject headings

supernova remnants; pulsars: general; pulsars: individual (AX J1811.5–1926); X-rays: general


Dates

Issue 2 (1997 November 10)

Received 1997 August 27, accepted for publication 1997 September 12

Published 1997 October 13



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