Discovery of a Possible Anomalous X-ray Pulsar in the Small Magellanic Cloud

Details Discovery of a Possible Anomalous X-ray Pulsar in the Small Magellanic Cloud Discovery of a Possible Anomalous X-ray Pulsar in the Small Magellanic Cloud

2002-05-17

arxiv.org/abs/astro-ph/0205310v3

Astrophys.J.574:L29-L32,2002; Addendum-ibid.599:L115-L116,2003

Astronomy and Astrophysics

Astrophysics

Current version accepted for publication in the Astrophysical Journal Letters

Scientific paper

10.1086/342352

We report the serendipitous detection of a previously unreported pulsar from the direction of the Small Magellanic Cloud using data from the CHANDRA X-Ray Observatory. Because of the luminosity of about 1.5x10^35 ergs/s, its near lack of variability for more than 20 years, and its soft spectrum we propose that it is an anomalous X-ray pulsar (AXP). Data from the ROSAT PSPC in conjunction with the CHANDRA data give a period, P, of 5.44 s and a spin down time, Pdot/P, of 11 ky. If this is a correct identification it will be the first extragalactic AXP and the fastest yet discovered.

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