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We report the discovery of pulsed X-ray emission from the compact source 1E1841-045, using data obtained with the Advanced Satellite for Cosmology andAstrophysics. The X-ray source is located in the center of the small-diametersupernova remnant (SNR) Kes 73 and is very likely to be the compactstellar-remnant of the supernova which formed Kes 73. The X-rays are pulsedwith a period of ~ 11.8 s, and a sinusoidal modulation of roughly 30 %. Weinterpret this modulation to be the rotation period of an embedded neutronstar, and as such would be the longest spin period for an isolated neutron starto-date. This is especially remarkable since the surrounding SNR is very young,at ~ 2000 yr old. We suggest that the observed characteristics of this objectare best understood within the framework of a neutron star with an enormousdipolar magnetic field, B ~ 8x10^14 G

The Discovery of an Anomalous X-Ray Pulsar in the Supernova Remnant K[CLC]es 73[/CLC]