Millisecond pulsars in the globular cluster 47 Tucanae
Millisecond pulsars in the globular cluster 47 Tucanae
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DOI：
10.1093/mnras/274.2.547
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发表时间：
1995-05
影响因子：
4.8
通讯作者：
Clive Robinson;A. Lyne;R. Manchester;M. Bailes;N. D'Amico;S. Johnston
中科院分区：
文献类型：
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作者：
Clive Robinson;A. Lyne;R. Manchester;M. Bailes;N. D'Amico;S. Johnston
过去几年在球状星团中寻找脉冲星已经在13个星团中发现了30多颗脉冲星。其中大约三分之一位于球状星团 47 Tucanae (NGC 104) 中，是使用澳大利亚帕克斯射电望远镜以 640 MHz 的观测频率发现的（曼彻斯特等人）。我们在 640 和 436 MHz 下对 47 颗杜鹃鸟进行了进一步观测，目的是寻找以前未被发现的脉冲星并对已知脉冲星进行计时测量。在这里，我们报告了在 436 MHz 脉冲星 47 Tuc N 的发现，但发现曼彻斯特等人之前报道的 47 Tuc K 并不存在。我们提出了孤立脉冲星 47 Tuc C 和 D 的定时解决方案。我们发现这两个脉冲星都具有负周期导数，这使我们能够对星团的中心密度设置下限。我们给出了 47 Tuc E 和 J 的双脉冲星的改进轨道解，并表明 47 Tuc J 在大约四分之一的轨道周期内被它的伴星遮蔽。获得了双脉冲星 47 Tuc I 的初步轨道解，该脉冲星可能也在食。最后，我们讨论了 47 颗杜鹃脉冲星的起源和演化。
Searches for pulsars in globular clusters during the past few years have discovered more than 30 pulsars in 13 clusters. About one-third of these are located in the globular cluster 47 Tucanae (NGC 104), and were discovered using the Parkes radio telescope in Australia at an observing frequency of 640 MHz (Manchester et al.). We have made further observations of 47 Tucanae at 640 and 436 MHz, with the aim of searching for previously undiscovered pulsars and performing timing measurements on the known ones. Here we report the discovery at 436 MHz of the pulsar 47 Tuc N, but find that 47 Tuc K, earlier reported by Manchester et al., is non-existent. We present timing solutions for the solitary pulsars 47 Tuc C and D. Both pulsars are found to have negative period derivatives which allow us to put a lower limit on the central density of the cluster. We give improved orbital solutions for the binary pulsars of 47 Tuc E and J, and show that 47 Tuc J is eclipsed by its companion for about a quarter of the orbital period. A preliminary orbital solution is obtained for the binary pulsar 47 Tuc I, which is probably also eclipsing. Finally, we discuss the origin and evolution of the 47 Tucanae pulsars.