球状星团中脉冲星的1.4-GHz阿雷西博巡天
A 1.4-GHz Arecibo Survey for Pulsars in Globular Clusters
摘要：
我们已经调查了所有22个已知的银河系球状星团可观察到的阿雷西博射电望远镜和70千秒差距内的太阳在~ 1.4 GHz的无线电脉动。数据是用宽带阿雷西博脉冲星处理器采集的，它提供了探测快速旋转的微弱脉冲星所需的大带宽和高时间和频率分辨率。我们还采用了先进的搜索技术，以保持对短轨道周期双星的敏感性。这些搜索在5个星团中发现了11个新的毫秒双星和2个有希望的候选者，几乎是阿雷西博可见球状星团中双星数量的两倍。其中10颗是双星系统，3颗是食星。这次巡天发现了比以往对同一星系团的巡天观测明显更多的极快速自旋双星（P_spin <~ 4 ms）和短轨道周期系统（P_orb <~ 6 hr）。我们讨论了这些系统的一些性质，以及球状星团脉冲星总体的一些特征，特别是它的光度分布。
英文摘要：
We have surveyed all 22 known Galactic globular clusters observable with the Arecibo radio telescope and within 70kpc of the Sun for radio pulsations at ~1.4GHz. Data were taken with the Wideband Arecibo Pulsar Processor, which provided the large bandwidth and high time and frequency resolution needed to detect fast-spinning, faint pulsars. We have also employed advanced search techniques to maintain sensitivity to short orbital period binaries. These searches have discovered 11 new millisecond pulsars and 2 promising candidates in 5 clusters, almost doubling the population of pulsars in the Arecibo-visible globular clusters. Ten of these new pulsars are in binary systems, and 3 are eclipsing. This survey has discovered significantly more very fast-spinning pulsars (P_spin <~ 4ms) and short orbital period systems (P_orb <~ 6hr) than previous surveys of the same clusters. We discuss some properties of these systems, as well as some characteristics of the globular cluster pulsar population in general, particularly its luminosity distribution.
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