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Lensed or not lensed: determining lensing magnifications for binary neutron star mergers from a single detection
Monthly Notices of the Royal Astronomical Society ( IF 4.8 ) Pub Date : 2020-05-23 , DOI: 10.1093/mnras/staa1430
Peter T H Pang 1, 2 , Otto A Hannuksela 1, 2 , Tim Dietrich 1, 3 , Giulia Pagano 4, 5 , Ian W Harry 6
Affiliation  

Advanced LIGO and Advanced Virgo could observe the first lensed gravitational wave sources in the coming years, while the future Einstein Telescope could observe hundreds of lensed events. It is, therefore, crucial to develop methodologies to distinguish between lensed from unlensed gravitational-wave observations. A lensed signal not identified as such will lead to biases during the interpretation of the source. In particular, sources will appear to have intrinsically higher masses. No robust method currently exists to distinguish between the magnification bias caused by lensing and intrinsically high-mass sources. In this work, we show how to recognize lensed and unlensed binary neutron star systems through the measurement of their tidal effects for highly magnified sources as a proof-of-principle. The proposed method could be used to identify lensed binary neutron stars, which are the chief candidate for lensing cosmography studies. We apply our method on GW190425, finding no evidence in favor of lensing, mainly due to the poor measurement of the event's tidal effects. However, we expect that future detections with better tidal measurements can yield better constraints.

中文翻译:

透镜或非透镜:通过单次探测确定双中子星合并的透镜放大倍数

Advanced LIGO 和 Advanced Virgo 可以在未来几年内观测到第一个透镜引力波源,而未来的爱因斯坦望远镜可以观测到数百个透镜事件。因此,开发区分透镜引力波观测和非透镜引力波观测的方法至关重要。未识别的透镜信号将导致在解释源过程中产生偏差。特别是,源似乎具有本质上更高的质量。目前没有可靠的方法来区分由透镜和本质上的高质量源引起的放大偏差。在这项工作中,我们展示了如何通过测量高放大源的潮汐效应来识别有透镜和无透镜的双中子星系统作为原理验证。所提出的方法可用于识别透镜双中子星,它们是透镜宇宙学研究的主要候选者。我们在 GW190425 上应用我们的方法,没有发现支持透镜的证据,主要是由于对事件潮汐效应的测量不佳。然而,我们预计未来具有更好潮汐测量的检测可以产生更好的约束。
更新日期:2020-05-23
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