Epoch J2000.0 Equinox J2000.0 (ICRS)
|Right ascension||16h 47m 10.20s|
|Declination||−45° 52′ 16.8″|
|Evolutionary stage||Neutron star|
|Apparent magnitude ()||>18.5|
|Distance||approx. 16000 ly
(approx. 5000 pc)
CXOU J164710.20-455217, CXOU J164710.2-455217
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. The Westerlund 1 cluster is believed to have formed in a single burst of star formation, 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.
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.
- A Neutron Star with a Massive Progenitor in Westerlund 1, Muno et al. (2006)
- Westerlund 1: Neutron Star Discovered Where a Black Hole Was Expected
- On the massive stellar population of the super star cluster Westerlund 1, Clark et al. (2005)
- 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.
- Exciting the magnetosphere of the magnetar CXOU J164710.2-455216 in Westerlund 1, Muno et al. (2007)
- Gavriil, F. P.; Woods, P. M.; Kaspi, V. M. (2006). "Chandra Target of Opportunity Observations of CXO J164710.2-455216". The Astronomer's Telegram. 901: 1. Bibcode:2006ATel..901....1G.