A Neutron Star with a Massive Progenitor in Westerlund 1
A Neutron Star with a Massive Progenitor in Westerlund 1
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DOI：
10.1086/499776
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发表时间：
2005-09
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影响因子：
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通讯作者：
M. Muno;J. Clark;P. Crowther;S. Dougherty;R. Grijs;C. Law;S. McMillan;M. Morris;I. Negueruela;D. Pooley;Simon Portegies;Zwart
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作者：
M. Muno;J. Clark;P. Crowther;S. Dougherty;R. Grijs;C. Law;S. McMillan;M. Morris;I. Negueruela;D. Pooley;Simon Portegies;Zwart
我们报告在年轻的大质量银河系星星星团韦斯特伦德1中发现了一颗X射线脉冲星。在2005年5月22日和6月18日的两次钱德拉观测中，我们从星团中最亮的X射线源CXO J164710.2-455216探测到了相干信号。脉冲星的周期为10.6107（1）s。我们对1 M的周期导数设置一个上限。综合起来，脉冲星的性质表明它是一颗磁星。慢X射线双星的稀有性和CXO J164710.2-455216距离Westerlund 1核心仅1.′6的位置表明它是星团的成员，置信度>99.97%。韦斯特隆德1包含07颗V型恒星，初始质量为Mi <$35 M，以及>50颗主序后恒星，表明该星团的年龄为400万年± 100万年。因此，这颗脉冲星的祖先具有初始质量Mi > 40 M的质量。这是中子星前身星质量的少数观测极限中最可靠的结果。
We report the discovery of an X-ray pulsar in the young, massive Galactic star cluster Westerlund 1. We detected a coherent signal from the brightest X-ray source in the cluster, CXO J164710.2-455216, during two Chandra observations on 2005 May 22 and June 18. The period of the pulsar is 10.6107(1) s. We place an upper limit to the period derivative of 1 M☉. Taken together, the properties of the pulsar indicate that it is a magnetar. The rarity of slow X-ray pulsars and the position of CXO J164710.2-455216 only 1.′6 from the core of Westerlund 1 indicates that it is a member of the cluster with >99.97% confidence. Westerlund 1 contains 07 V stars with initial masses Mi ≈ 35 M☉ and >50 post-main-sequence stars that indicate the cluster is 4 ± 1 Myr old. Therefore, the progenitor to this pulsar had an initial mass Mi > 40 M☉. This is the most secure result among a handful of observational limits to the masses of the progenitors to neutron stars.