论文标题
强烈的镜头作为巨型望远镜，可以定位引力波事件的宿主星系
Strong lensing as a giant telescope to localize the host galaxy of gravitational wave event
论文作者
论文摘要
重力波（GW）合并事件的标准警笛宇宙学取决于宿主星系及其红移的识别。但是，由于GW定位区域中的许多星系候选人，这可能是高度挑战的。我们指出，由于额外的观察性约束，可以通过强烈镜头GW事件的数量级来减少候选人的数量。对于像爱因斯坦望远镜（ET）这样的下一代GW探测器，我们估计，只要GW定位不确定性优于$ \ sim 10 \，\ rm deg^2 $，这个数字通常明显小于一个。这意味着可以通过ET和Cosmic Explorer（CE）检测到的镜头GW事件的宿主星系的唯一识别。这为我们提供了一个有前途的机会来衡量GW事件的红移并促进标准的警笛宇宙学。我们还讨论了其在理解GW事件的演化过程和环境中的潜在应用。
Standard siren cosmology of gravitational wave (GW) merger events relies on the identification of host galaxies and their redshifts. But this can be highly challenging due to numerous candidates of galaxies in the GW localization area. We point out that the number of candidates can be reduced by orders of magnitude for strongly lensed GW events, due to extra observational constraints. For the next-generation GW detectors like Einstein Telescope (ET), we estimate that this number is usually significantly less than one, as long as the GW localization uncertainty is better than $\sim 10\, \rm deg^2$. This implies that the unique identification of the host galaxy of lensed GW event detected by ET and Cosmic Explorer (CE) is possible. This provides us a promising opportunity to measure the redshift of the GW event and facilitate the standard siren cosmology. We also discuss its potential applications in understanding the evolution process and environment of the GW event.
