Sky localization of space-based gravitational wave detectors

Chao Zhang, Y. Gong, Hang Liu, Bin Wang, Chunyu Zhang
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引用次数: 13

Abstract

Localizing the sky position of the gravitational wave source is a key scientific goal for gravitational wave observations. Employing the Fisher Information Matrix Approximation, we compute the angular resolutions of LISA and TianQin, two planned space-based gravitational wave detectors and examine how detectors' configuration properties, such as the orientation change of the detector plane, heliocentric or geocentric motion and the arm length etc. affect the accuracy of source localization. We find that the amplitude modulation due to the annual changing orientation of the detector plane helps LISA get better accuracy in the sky localization and better sky coverage at frequencies below several mHz, and its effect on TianQin is negligible although the orientation of TianQin's detector plane is fixed. At frequencies above roughly 30mHz, TianQin's ability in the sky localization is better than LISA. Further we explore potential space detector networks for fast and accurate localization of the gravitational wave sources. The LISA-TianQin network has better ability in sky localization for sources with frequencies in the range 1-100 mHz and the network has larger sky coverage for the angular resolution than the individual detector.
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天基引力波探测器的天空定位
定位引力波的天空位置是引力波观测的关键科学目标。利用Fisher信息矩阵逼近法,计算了LISA和天琴两种天基引力波探测器的角分辨率,研究了探测器平面方向变化、日心或地心运动、臂长等配置特性对引力波定位精度的影响。我们发现,由于探测平面每年变化的方向而产生的调幅有助于LISA在几mHz以下频率获得更好的天空定位精度和更好的天空覆盖,尽管天琴探测平面的方向是固定的,但其对天琴的影响可以忽略不计。在大约30mHz以上的频率上,天琴的天空定位能力优于LISA。进一步,我们探索了潜在的空间探测器网络,用于快速准确地定位引力波源。LISA-TianQin网络对1 ~ 100mhz频率源具有更好的天空定位能力,在角分辨率上比单个探测器具有更大的天空覆盖范围。
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