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CXOU J164710.2-455216
CXOU J164710.2-455216 is an anomalous X-ray pulsar in the massive galactic open cluster Westerlund 1. It is the brightest X-ray source in the cluster, and was discovered
in 2005 in observations made by the Chandra X-ray observatory.〔〔( Westerlund 1: Neutron Star Discovered Where a Black Hole Was Expected )〕 The Westerlund 1 cluster is believed to have formed in a single burst of star formation,〔(On the massive stellar population of the super star cluster Westerlund 1, Clark et al. (2005) )〕 implying that the progenitor star must have had a mass in excess of 40 solar masses. The fact that a neutron star was formed instead of a black hole implies that more than 95% of the star's original mass must have been lost before or during the supernova that produced the magnetar.〔(Magnetar Formation Mystery Solved, eso1415 - Science Release (14 May 2014) )〕〔Wood, Chris. "(Very Large Telescope solves magnetar mystery )" ''GizMag'', 14 May 2014. Accessed: 18 May 2014.〕
On 21 September 2006 the Swift satellite detected a 20ms soft Gamma-ray burst in Westerlund 1. Fortuitously, XMM-Newton observations had been made four days earlier, and repeat observations 1.5 days after the burst revealed the magnetar to be the source of the burst, with the X-ray luminosity increasing by a factor of 100 during the outburst.〔(Exciting the magnetosphere of the magnetar CXOU J164710.2-455216 in Westerlund 1, Muno et al. (2007) )〕
==References==
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