Robust Strong Lensing Time Delay Estimation
Robust Strong Lensing Time Delay Estimation
复制标题
鲁棒强透镜时间延迟估计
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
E. Linder
中科院分区：
文献类型：
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作者：
A. Hojjati;A. Kim;E. Linder
类星体和超新星等时变源的强引力透镜在多幅图像之间产生了可观察到的时间延迟。时间延迟可以通过涉及透镜、源和透镜-源距离的比率的“时间延迟距离”提供强有力的宇宙学探测。然而，透镜图像的光变曲线具有测量间隙、噪声、系统性（诸如来自子结构沿着图像视线的微透镜化），并且没有先验函数模型，使得鲁棒时延估计具有挑战性。使用高斯过程技术，我们证明了成功的精确盲重建的时间延迟和减少不确定性的真实的数据。
Strong gravitational lensing of time variable sources such as quasars and supernovae creates observable time delays between the multiple images. Time delays can provide a powerful cosmographic probe through the ``time-delay distance'' involving the ratio of lens, source, and lens-source distances. However, light curves of lensed images have measurement gaps, noise, systematics such as microlensing from substructure along an image line of sight, and no a priori functional model, making robust time-delay estimation challenging. Using Gaussian process techniques, we demonstrate success in accurate blind reconstruction of time delays and reduction in uncertainties for real data.