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arXiv 1912.03386astro-ph.COastro-ph.GA
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宇宙学的几何探索(一)引力透镜时间延迟与类星体混响映射

A Geometric Probe of Cosmology: I. Gravitational Lensing Time Delays and Quasar Reverberation Mapping

Angela L. H. Ng, Geraint F. Lewis

摘要:

我们提出了一种新颖的、纯粹的几何宇宙学探测,该探测基于对有限源效应导致的强透镜类星体图像之间的差分时间延迟的测量。我们的方法是完全依赖于宇宙学通过角直径距离的比率,图像分离,和源的大小。因此,它完全避免了传统上限制时间延迟宇宙学的透镜建模的挑战,而是需要类星体宽线区域的透镜混响映射。我们表明,差分时间延迟是可测量的短节奏的光谱监测透镜类星体,通过运动学确定的功能广泛的发射线内的时间。这提供了一个几何确定的角直径距离比互补的标准探头,因此是一个潜在的强大的新方法约束宇宙学。

英文摘要:

We present a novel, purely geometric probe of cosmology based on measurements of differential time delays between images of strongly lensed quasars due to finite source effects. Our approach is solely dependent on cosmology via a ratio of angular diameter distances, the image separation, and the source size. It thereby entirely avoids the challenges of lens modelling that conventionally limit time delay cosmography, and instead entails the lensed reverberation mapping of the quasar Broad Line Region. We demonstrate that differential time delays are measurable with short cadence spectroscopic monitoring of lensed quasars, through the timing of kinematically identified features within the broad emission lines. This provides a geometric determination of an angular diameter distance ratio complementary to standard probes, and as a result is a potentially powerful new method of constraining cosmology.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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