Discovery of a Candidate Isolated Neutron Star in a New Supernova Remnant Near CTB 1

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Abstract
We have discovered a neutron star candidate in the region near the supernova remnant CTB 1 (G116.9+0.2). The source is located near the center of a previously unknown shell of soft X-ray emission (G117.7+0.6), which is consistent with a middle-aged supernova remnant. The X-ray emission is periodic at the 99% confidence level with a period of 0.24181 s. The thermal X-ray emission is probably residual heat of formation from the cooling neutron star. We cannot entirely rule out a less likely possibility that the X-rays have an origin in the magnetosphere. A comparison of the neutron star age and temperature with cooling theories is presented.