Facilitating Follow-up of LIGO–Virgo Events Using Rapid Sky Localization
Facilitating Follow-up of LIGO–Virgo Events Using Rapid Sky Localization
复制标题
使用快速天空定位促进 LIGO–Virgo 事件的后续行动
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
D. Holz
中科院分区：
文献类型：
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作者：
Hsin;D. Holz
我们讨论了一种仅使用相对到达时间、相对相位和相对信噪比来定位引力波(GW)源的精确和极低延迟(S)的算法。该算法与距离和质量无关，可以推广到地面探测器网络探测到的所有离散(而不是随机和连续)源。我们的方法类似于BAYESTAR的方法，但做了一些修改，从而提高了计算效率。对于运行在O1中的LIGO双探测器组态(Hanford+Livingston)，我们发现双中子星的中位数为143°2(558°2)，中位数为50%(90%)。我们使用我们的算法来探索噪声事件对定位的改善，发现前4(或10)个事件中声音最大的事件对于两个GW探测器的情况减少了1.9(3.0)倍的中值天空定位面积，对于三个探测器的情况减少了2.2(4.0)倍。我们还考虑了引力和电磁辐射中多信使联合探测的情况，并表明联合定位可以提供显著的改进(例如，在LIGO和Fermi/GBM联合探测的情况下)。我们表明，GRB观测可能引起的二元倾角的先验，对GW局部化的影响可以忽略不计。我们的算法简单、快速、准确，在多信使天文学的发展中可能特别有用。
We discuss an algorithm for accurate and very low-latency (<1 s) localization of gravitational-wave (GW) sources using only the relative times of arrival, relative phases, and relative signal-to-noise ratios for pairs of detectors. The algorithm is independent of distances and masses to leading order, and can be generalized to all discrete (as opposed to stochastic and continuous) sources detected by ground-based detector networks. Our approach is similar to that of BAYESTAR with a few modifications, which result in increased computational efficiency. For the LIGO two-detector configuration (Hanford+Livingston) operating in O1 we find a median 50% (90%) localization of 143 deg2 (558 deg2) for binary neutron stars. We use our algorithm to explore the improvement in localization resulting from loud events, finding that the loudest out of the first 4 (or 10) events reduces the median sky-localization area by a factor of 1.9 (3.0) for the case of two GW detectors, and 2.2 (4.0) for three detectors. We also consider the case of multi-messenger joint detections in both the gravitational and the electromagnetic radiation, and show that joint localization can offer significant improvements (e.g., in the case of LIGO and Fermi/GBM joint detections). We show that a prior on the binary inclination, potentially arising from GRB observations, has a negligible effect on GW localization. Our algorithm is simple, fast, and accurate, and may be of particular utility in the development of multi-messenger astronomy.