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arXiv 0905.1705gr-qc
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Einstein@Home在早期S5 LIGO数据中寻找周期引力波

Einstein@Home search for periodic gravitational waves in early S5 LIGO data

LIGO Scientific Collaboration

摘要:

本文报道了一个全天搜索周期性引力波的来源,如变形孤立的快速旋转的中子星。该分析使用了第五次LIGO科学运行(S5)66天的840小时数据。对数据进行了搜索,以寻找频率f在50 Hz至1500 Hz范围内的准单色波,线性频率漂移\dot{f}(在太阳系重心处测量)在-f/τ< \dot{f} < 0.1 f/τ范围内,对于低于400 Hz的信号,最小自旋下降年龄τ为1000年,高于400 Hz的信号为8000年。搜索的主要计算工作分布在大约10万台由公众自愿提供的计算机上。这种大的计算能力允许使用30小时的相对较长的相干积分时间,同时搜索大的参数空间。这次搜索将Einstein@Home之前在LIGO S4数据中的搜索扩展到了大约三倍的灵敏度。在125 Hz到225 Hz波段,超过90%的无量纲引力波应变张量振幅大于3e-24的源都可以被探测到。

英文摘要:

This paper reports on an all-sky search for periodic gravitational waves from sources such as deformed isolated rapidly-spinning neutron stars. The analysis uses 840 hours of data from 66 days of the fifth LIGO science run (S5). The data was searched for quasi-monochromatic waves with frequencies f in the range from 50 Hz to 1500 Hz, with a linear frequency drift \dot{f} (measured at the solar system barycenter) in the range -f/τ< \dot{f} < 0.1 f/τ, for a minimum spin-down age τof 1000 years for signals below 400 Hz and 8000 years above 400 Hz. The main computational work of the search was distributed over approximately 100000 computers volunteered by the general public. This large computing power allowed the use of a relatively long coherent integration time of 30 hours while searching a large parameter space. This search extends Einstein@Home's previous search in LIGO S4 data to about three times better sensitivity. No statistically significant signals were found. In the 125 Hz to 225 Hz band, more than 90% of sources with dimensionless gravitational-wave strain tensor amplitude greater than 3e-24 would have been detected.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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