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A NEUTRON STAR WITH A MASSIVE PROGENITOR IN WESTERLUND 1

机译:韦斯特伦德1中有中子祖的中子星

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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 P < 2 x 10~(-10) s s~(-1), which implies that the spin-down luminosity is E ≤ 3 x 10~(33) ergs s~(-1). The X-ray luminosity of the pulsar is L_x ≈ 3_(-2)~(+10) 10~(33)(D/5 kpc)~2 ergs s~(-1), and the spectrum can be described by a kT = 0.61_(-0.02)~(+0.02) keV blackbody with a radius of R_(bb) = 0.27 ± 0.03(D/5 kpc) km. Deep infrared observations reveal no counterpart with K < 18.5, which rules out a binary companion with M > 1 solar mass. 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 M_i ≈ 35 solar mass 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 M_i > 40 solar mass. This is the most secure result among a handful of observational limits to the masses of the progenitors to neutron stars.
机译:我们报告了在年轻的大型银河星团Westerlund 1中发现X射线脉冲星的过程。在2005年的两次Chandra观测中,我们检测到了来自该簇中最亮的X射线源CXO J164710.2-455216的相干信号。 5月22日和6月18日。脉冲星的周期为10.6107(1)s。我们将周期导数的上限设置为P <2 x 10〜(-10)ss〜(-1),这意味着降速发光度为E≤3 x 10〜(33)ers s〜(- 1)。脉冲星的X射线光度为L_x≈3 _(-2)〜(+10)10〜(33)(D / 5 kpc)〜2 ers s〜(-1),光谱可用kT = 0.61 _(-0.02)〜(+0.02)keV黑体,半径R_(bb)= 0.27±0.03(D / 5 kpc)km。深红外观测没有发现K <18.5的对应物,这排除了M> 1太阳质量的二元伴星。脉冲星的性质合起来表明它是一个磁星。慢速X射线脉冲星的稀有性以及CXO J164710.2-455216距Westerlund 1核心仅1.6'的位置,表明它是该星团的成员,其置信度> 99.97%。 Westerlund 1包含07个V恒星,初始质量M_i≈35太阳质量,> 50个主序后恒星,表明该星团的年龄为4±1 Myr。因此,该脉冲星的祖先的初始质量M_i> 40太阳质量。在对中子星祖细胞质量的少数观测极限中,这是最安全的结果。

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