标题： 对天蝎座 X-1 源的引力波定向搜寻：初始 LIGO 分析 显示英文标题

标题： A directed search for gravitational waves from Scorpius X-1 with initial LIGO

摘要： 我们报告了一项针对连续引力波的搜索结果，目标是亮度最高的低质量X射线双星Scorpius X-1。 我们的半相干分析涵盖了LIGO S5数据中的10天数据，频率范围为50-550 Hz，并对分布在频率调制轨道边带中的相干$\mathcal{F}$统计功率进行了非相干叠加。 所有未在剔除阶段被移除的候选信号，在1%的虚警率下均与噪声一致。 我们使用两种不同的先验分布给出了引力波应变振幅的贝叶斯95%置信上限：一种标准的，不对Scorpius X-1的方向做任何先验假设；另一种角度受限的，使用来自电磁观测推导出的先验。 分别对于标准和角度受限搜索，在150 Hz处报告的中值应变上限分别为1.3e-24和8e-25。 由于中子星固有自旋频率受吸积未知影响，这项原理验证分析仅限于较短的观测时间，但在探测器的灵敏区域，标准搜索和角度受限搜索的上限分别改进了约1.4倍和2.3倍。 显示英文摘要

摘要： We present results of a search for continuously-emitted gravitational radiation, directed at the brightest low-mass X-ray binary, Scorpius X-1. Our semi-coherent analysis covers 10 days of LIGO S5 data ranging from 50-550 Hz, and performs an incoherent sum of coherent $\mathcal{F}$-statistic power distributed amongst frequency-modulated orbital sidebands. All candidates not removed at the veto stage were found to be consistent with noise at a 1% false alarm rate. We present Bayesian 95% confidence upper limits on gravitational-wave strain amplitude using two different prior distributions: a standard one, with no a priori assumptions about the orientation of Scorpius X-1; and an angle-restricted one, using a prior derived from electromagnetic observations. Median strain upper limits of 1.3e-24 and 8e-25 are reported at 150 Hz for the standard and angle-restricted searches respectively. This proof of principle analysis was limited to a short observation time by unknown effects of accretion on the intrinsic spin frequency of the neutron star, but improves upon previous upper limits by factors of ~1.4 for the standard, and 2.3 for the angle-restricted search at the sensitive region of the detector.