论文标题
TDCOSMO V：具有强镜头的哈勃常数精确和准确测量的策略
TDCOSMO V: strategies for precise and accurate measurements of the Hubble constant with strong lensing
论文作者
论文摘要
强烈的镜头时间延迟可以测量与其他探针无关的哈勃常数h $ _0 $。假设镜片的径向质量密度谱通常使用的形式，使用7个时间播放宇宙学（TDCOSMO）镜片达到了2 \％的精度，与宇宙微波背景的H $ _0 $紧张。但是，如果没有关于径向质量密度谱的假设 - 并且仅依靠出色的运动学破坏质量表脱落性，则精确度下降到8 \％，使用7 TDCOSMO镜头的当前数据，不足以解决H $ _0 $ _0 $张力。通过添加来自33个Sloan透镜ACS（SLAC）镜头的外部信息，精度提高到5 \％，{\ it} TDCOSMO和SLACS镜头的偏转器是从同一人群中绘制的。我们研究了提高时间延迟宇宙学精确度的前景，而不依赖于质谱假设破坏质量表堕落。我们的预测基于Birrer等人介绍的分层框架。 （2020）。使用现有的样品和技术，可以通过添加7 tdcosmo镜头的空间分辨运动学来达到H $ _0 $的3.3 \％精度。通过进一步添加SLAC的50个非时光透明镜头和强烈的镜头遗产调查（SL2S）的运动运动学进一步添加，精度提高到2.5 \％。将样品扩展到40个时间延迟和200个非时延迟镜头将分别提高到1.5 \％和1.2 \％。时间延迟的宇宙学可以达到足够的精确度，以解决Hubble的张力在3-5 $σ$，而没有对透镜星系的径向质量分布的假设。通过有或没有外部数据集获得此精度，我们将测试样品的一致性，并基于更大的未来时间延迟样本和非时光延迟镜头（例如，来自鲁宾，欧几里得和罗马观测值）进行进一步的改进。
Strong lensing time delays can measure the Hubble constant H$_0$ independent of any other probe. Assuming commonly used forms for the radial mass density profile of the lenses, a 2\% precision has been achieved with 7 Time-Delay Cosmography (TDCOSMO) lenses, in tension with the H$_0$ from the cosmic microwave background. However, without assumptions on the radial mass density profile -- and relying exclusively on stellar kinematics to break the mass-sheet degeneracy -- the precision drops to 8\% with the current data of the 7 TDCOSMO lenses, insufficient to resolve the H$_0$ tension. With the addition of external information from 33 Sloan Lens ACS (SLACS) lenses, the precision improves to 5\%, {\it if} the deflectors of TDCOSMO and SLACS lenses are drawn from the same population. We investigate the prospects to improve the precision of time-delay cosmography without relying on mass profile assumptions to break the mass sheet degeneracy. Our forecasts are based on the hierarchical framework introduced by Birrer et al. (2020). With existing samples and technology, 3.3\% precision on H$_0$ can be reached by adding spatially resolved kinematics of the 7 TDCOSMO lenses. The precision improves to 2.5\% with the further addition of kinematics for 50 non-time-delay lenses from SLACS and the Strong Lensing Legacy Survey (SL2S). Expanding the samples to 40 time delay and 200 non-time delay lenses will improve the precision to 1.5\% and 1.2\%, respectively. Time-delay cosmography can reach sufficient precision to resolve the Hubble tension at 3-5$σ$, without assumptions on the radial mass profile of lens galaxies. By obtaining this precision with and without external datasets, we will test the consistency of the samples and enable further improvements based on even larger future samples of time delay and non-time-delay lenses (e.g. from the Rubin, Euclid, and Roman Observatories).
