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arXiv 0810.2264gr-qc
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利用时间和振幅信息估计引力波爆发源方向

Gravitational Wave Burst Source Direction Estimation using Time and Amplitude Information

J. Markowitz, M. Zanolin, L. Cadonati, E. Katsavounidis

摘要:

在这篇文章中,我们研究了两个问题时出现的时间和振幅估计从网络的干涉仪(IFO)来评估的入射引力波爆发(GWB)的方向。首先,我们讨论的角度偏差的最小二乘定时为基础的方法,变得越来越相关的中到低的信噪比。我们展示了如何估计到达时间的不确定性,在每个检测器可以用来纠正这种偏见。我们还介绍了一个独立的参数估计算法,可以提高到达时间的估计,并提供根和平方应变幅度(hrss)值为每个站点。在本文的第二部分中,我们讨论了如何解决的方向性模糊,所产生的观察在三个非共位干涉仪之间的真实源位置和它的镜像在平面上包含的检测器。我们引入了一个新的,确切的关系hrss值在三个站点,对于足够大的信号幅度,确定真正的源方向,无论信号是否是线性极化。估计到达时间、到达时间不确定性和hrss值的算法和方向跟踪都可以应用于在三个非共址干涉仪网络中观测到的任何一组引力波候选者。作为一个案例研究,我们测试嵌入在模拟的噪声的LIGO和处女座探测器在设计灵敏度的模拟波形的方法。

英文摘要:

In this article we study two problems that arise when using timing and amplitude estimates from a network of interferometers (IFOs) to evaluate the direction of an incident gravitational wave burst (GWB). First, we discuss an angular bias in the least squares timing-based approach that becomes increasingly relevant for moderate to low signal-to-noise ratios. We show how estimates of the arrival time uncertainties in each detector can be used to correct this bias. We also introduce a stand alone parameter estimation algorithm that can improve the arrival time estimation and provide root-sum-squared strain amplitude (hrss) values for each site. In the second part of the paper we discuss how to resolve the directional ambiguity that arises from observations in three non co-located interferometers between the true source location and its mirror image across the plane containing the detectors. We introduce a new, exact relationship among the hrss values at the three sites that, for sufficiently large signal amplitudes, determines the true source direction regardless of whether or not the signal is linearly polarized. Both the algorithm estimating arrival times, arrival time uncertainties, and hrss values and the directional follow-up can be applied to any set of gravitational wave candidates observed in a network of three non co-located interferometers. As a case study we test the methods on simulated waveforms embedded in simulations of the noise of the LIGO and Virgo detectors at design sensitivity.

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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