View source for Astronomy:CXOU J164710.2−455216

{{Short description|Anomalous X-ray pulsar in Westerlund 1}}
{{Starbox begin |
 name=CXOU J164710.2−455216 }}
{{Starbox image
 | image= [[File:Artist’s impression of the magnetar in the star cluster Westerlund 1.jpg|280 px]]
 | caption = Artist's impression of CXOU J164710.2-455216}}
{{Starbox observe |
 epoch=[[Astronomy:J2000.0|J2000.0]] ([[Astronomy:International Celestial Reference System|ICRS]]) |
 constell=[[Astronomy:Ara (constellation)|Ara]] |
 ra={{RA|16|47|10.20}} |
 dec={{DEC|−45|52|16.8}} }}

{{Starbox character
| type = [[Astronomy:Neutron star|Neutron star]]<!--Type of star (e.g., Main sequence, protostar, White dwarf, neutron star, etc.)-->
| class = <!--Stellar class-->
| appmag_1_passband = <math>\begin{smallmatrix}K_s \end{smallmatrix}</math> <!-- Passband for first apparent magnitude (e.g., H, J, K, etc.) -->
| appmag_1 = >18.5<ref name=Muno>[https://arxiv.org/abs/astro-ph/0509408 A Neutron Star with a Massive Progenitor in Westerlund 1, Muno et al. (2006)]</ref> <!-- Value of first apparent magnitude  -->
| appmag_2_passband = <!-- Passband for second apparent magnitude (e.g., H, J, K, etc.) -->
| appmag_2 = <!-- Value of second apparent magnitude  -->
| appmag_3_passband = <!-- Passband for third apparent magnitude (e.g., H, J, K, etc.) -->
| appmag_3 = <!-- Value of third apparent magnitude  -->
| appmag_4_passband = <!-- Passband for fourth apparent magnitude (e.g., H, J, K, etc.) -->
| appmag_4 = <!-- Value of fourth apparent magnitude  -->
| appmag_5_passband = <!-- Passband for fifth apparent magnitude (e.g., H, J, K, etc.) -->
| appmag_5 = <!-- Value of fifth apparent magnitude  -->
| appmag_6_passband = <!-- Passband for sixth apparent magnitude (e.g., H, J, K, etc.) -->
| appmag_6 = <!-- Value of sixth apparent magnitude  -->
| appmag_7_passband = <!-- Passband for seventh apparent magnitude (e.g., H, J, K, etc.) -->
| appmag_7 = <!-- Value of seventh apparent magnitude  -->
| appmag_8_passband = <!-- Passband for eighth apparent magnitude (e.g., H, J, K, etc.) -->
| appmag_8 = <!-- Value of eighth apparent magnitude  -->
| r-i = <!--R-I color-->
| v-r = <!--V-R color-->
| b-v = <!--B-V color-->
| u-b = <!--U-B color-->
| j-h = <!--J-H color-->
| j-k = <!--J-K color-->
| variable = <!--Variability type-->
}}

{{Starbox astrometry
 | radial_v = <!--Radial velocity (in km/sec)-->
 | prop_mo_ra = <!--Proper motion (RA), μ<sub>α</sub> cos δ (in milliarcsec/yr)-->
 | prop_mo_dec = <!--Proper motion (dec), μ<sub>δ</sub> (in milliarcsec/yr)-->
 | parallax = <!--Parallax (in milliarcsec)-->
 | p_error = <!--Parallax error (in milliarcsec)-->
 | parallax_footnote = <!--Parallax footnote-->
 | dist_ly = approx. 16,000<!--Distance (in light-years)-->
 | dist_pc = approx. 5,000<!--Distance (in parsecs)-->
 | absmag_v = <!--Absolute magnitude ([[Astronomy:UBV photometric system|Johnson-Cousins V system]])-->
 }}
{{Starbox detail
| mass=
| radius=
| luminosity=
| temperature=
| metal=
| rotation=10.6105(1)s
| age=}}
{{Starbox catalog
| names=CXO J164710.20−455217, CXOU J164710.2−455217}}
{{Starbox reference
| Simbad = CXOU+J164710.2-455216
}}
{{Starbox end}}

'''CXOU J164710.2−455216''' is an [[Astronomy:Anomalous X-ray pulsar|anomalous X-ray pulsar]] and [[Astronomy:Magnetar|magnetar]] in the massive galactic [[Astronomy:Open cluster|open cluster]] [[Astronomy:Westerlund 1|Westerlund 1]]. It is the brightest [[Physics:X-ray|X-ray]] source in the cluster, and was discovered in 2005 in observations made by the [[Astronomy:Chandra X-ray Observatory|Chandra X-ray Observatory]].<ref name=Muno/><ref>[http://chandra.harvard.edu/photo/2005/wd1/  Westerlund 1: Neutron Star Discovered Where a Black Hole Was Expected]</ref> The Westerlund 1 cluster is believed to have formed in a single burst of star formation,<ref name=clark>[http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/full/2005/18/aa2413/aa2413.html On the massive stellar population of the super star cluster  Westerlund 1, Clark et al. (2005)]</ref> implying that the progenitor star must have had a mass in excess of 40 [[Astronomy:Solar mass|solar mass]]es. The fact that a [[Astronomy:Neutron star|neutron star]] was formed instead of a [[Astronomy:Black hole|black hole]] implies that more than 95% of the star's original mass must have been lost before or during the [[Astronomy:Supernova|supernova]] that produced the magnetar.<ref name=eso>[http://www.eso.org/public/news/eso1415/ Magnetar Formation Mystery Solved, eso1415 - Science Release (14 May 2014)]</ref><ref>Wood, Chris. "[http://www.gizmag.com/vlt-magnetar-mystery-solved/32101/ Very Large Telescope solves magnetar mystery]" ''GizMag'', 14 May 2014. Accessed: 18 May 2014.</ref>

On 21 September 2006 the [[Astronomy:Neil Gehrels Swift Observatory|Swift satellite]] detected a 20ms soft [[Astronomy:Gamma-ray burst|gamma-ray burst]] in Westerlund 1. Fortuitously, [[Astronomy:XMM-Newton|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.<ref>[http://adsabs.harvard.edu/abs/2007MNRAS.378L..44M Exciting the magnetosphere of the magnetar CXOU J164710.2−455216 in Westerlund 1, Muno et al. (2007)]</ref>

==References==
{{Reflist}}
* {{cite journal|bibcode=2006ATel..901....1G|author1=Gavriil, F. P. |author2=Woods, P. M. |author3=Kaspi, V. M.  |title=Chandra Target of Opportunity Observations of CXO J164710.2−455216|journal=The Astronomer's Telegram |volume=901|pages=1|year=2006}} 
* [http://jumk.de/astronomie/special-stars/cxo-j164710.2-455216.shtml cxo-j164710.2-455216]

{{Ara (constellation)}}

{{Sky|16|47|10.20|−|45|52|16.8|17000}}

{{DEFAULTSORT:CXOU J164710.2-455216}}
[[Category:Ara (constellation)]]
[[Category:Magnetars]]

{{Sourceattribution|CXOU J164710.2−455216}}