FAST在球状星团NGC 6517中发现的三颗脉冲星及基于色散测度的脉冲星候选筛选码--信噪比图
Three Pulsars Discovered by FAST in the Globular Cluster NGC 6517 with a Pulsar Candidate Sifting Code Based on Dispersion Measure to Signal-to-Noise Ratio Plots
摘要：
本文报道了利用500米口径球面射电望远镜（FAST）在球状星团（GC）NGC6517中发现的三颗新双星，即NGC6517 E、F和G。NGC6517E、F和G的自旋周期分别为7.60、24.89和51.59 ms。它们的色散测量值分别为183.29、183.713和185.3 pc cm $^{-3}$，都比该星团中已知的双星略大。自旋周期导数为1 $\times$ × 10 $^{-18}$~s~s $^{-1}$，表明这些是再循环的质子。除了发现这三颗新的双星外，我们还更新了已知孤立双星NGC 6517 A、C和D的时间解。这些解与Lynch等人（2011）的解一致，并且具有较小的时间残差。从时间解来看，NGC 6517 A、B（位置来自Lynch et al. 2011）、C、E和F在天空中彼此非常接近，距离NGC 6517的光学核心只有几角秒。根据目前已发表和未发表的发现，NGC6517现在有9个天体，在拥有最多天体的GC中排名第5位$^{th}$。这些发现利用了FAST的高灵敏度和一种用于检查和过滤可能的候选信号的新算法。
英文摘要：
We report the discovery of three new pulsars in the Globular Cluster (GC) NGC6517, namely NGC 6517 E, F, and G, made with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). The spin periods of NGC 6517 E, F, and G are 7.60~ms, 24.89~ms, and 51.59~ms, respectively. Their dispersion measures are 183.29, 183.713, and 185.3~pc~cm$^{-3}$, respectively, all slightly larger than those of the previously known pulsars in this cluster. The spin period derivatives are at the level of 1$\times$10$^{-18}$~s~s$^{-1}$, which suggests these are recycled pulsars. In addition to the discovery of these three new pulsars, we updated the timing solutions of the known isolated pulsars, NGC 6517 A, C, and D. The solutions are consistent with those from Lynch et al. (2011) and with smaller timing residuals. From the timing solution, NGC 6517 A, B (position from Lynch et al. 2011), C, E, and F are very close to each other on the sky and only a few arcseconds from the optical core of NGC 6517. With currently published and unpublished discoveries, NGC6517 now has 9 pulsars, ranking 5$^{th}$ of the GCs with the most pulsars. The discoveries take advantage of the high sensitivity of FAST and a new algorithm used to check and filter possible candidate signals.
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