论文标题
重力镜头图像的瞬时红移差异：理论和观察前景
The Instantaneous Redshift Difference of Gravitationally Lensed Images: Theory and Observational Prospects
论文作者
论文摘要
由于我们的宇宙的扩展，远处对象的红移随时间变化。尽管这种红移漂移的幅度很小，但对于下一代望远镜进行了长达十年的活动，它将可以衡量。在这里，我们提供了红移漂移的替代视图，该视图捕获了宇宙在重力镜头源的多个图像的单个时期观测中的扩展。考虑到足够庞大的镜头，数十年来的订单数十年的时间延迟，与另一个图像相比，几十年前，同时到达检测器的光子将在一个图像中发出，从而导致图像之间的瞬时红移差异。我们还研究了特殊速度对观察到的图像中红移差异的影响。尽管仍然需要下一代望远镜和仪器的观察力，但这种单个时期检测的优势比其他红移漂移测量值的优势是，它将不太容易受到数十年来竞选活动的仪器稳定性造成的系统效应。
Due to the expansion of our Universe, the redshift of distant objects changes with time. Although the amplitude of this redshift drift is small, it will be measurable with a decade-long campaigns on the next generation of telescopes. Here we present an alternative view of the redshift drift which captures the expansion of the universe in single epoch observations of the multiple images of gravitationally lensed sources. Considering a sufficiently massive lens, with an associated time delay of order decades, simultaneous photons arriving at a detector would have been emitted decades earlier in one image compared to another, leading to an instantaneous redshift difference between the images. We also investigate the effect of peculiar velocities on the redshift difference in the observed images. Whilst still requiring the observational power of the next generation of telescopes and instruments, the advantage of such a single epoch detection over other redshift drift measurements is that it will be less susceptible to systematic effects that result from requiring instrument stability over decade-long campaigns.
