The Impact of Observing Strategy on Cosmological Constraints with LSST
The Impact of Observing Strategy on Cosmological Constraints with LSST
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DOI：
10.3847/1538-4365/ac5033
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发表时间：
2021-04
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通讯作者：
M. Lochner;D. Scolnic;H. Almoubayyed;T. Anguita;H. Awan;E. Gawiser;S. Gontcho;P. Gris;S. Huber;S. Jha;R. L. Jones;A. Kim;R. Mandelbaum;P. Marshall;T. Petrushevska;N. Regnault;C. Setzer;S. Suyu;P. Yoachim;R. Biswas;T. Blaineau;I. Hook;M. Moniez;E. Neilsen;H. Peiris;D. Rothchild;C. Stubbs
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作者：
M. Lochner;D. Scolnic;H. Almoubayyed;T. Anguita;H. Awan;E. Gawiser;S. Gontcho;P. Gris;S. Huber;S. Jha;R. L. Jones;A. Kim;R. Mandelbaum;P. Marshall;T. Petrushevska;N. Regnault;C. Setzer;S. Suyu;P. Yoachim;R. Biswas;T. Blaineau;I. Hook;M. Moniez;E. Neilsen;H. Peiris;D. Rothchild;C. Stubbs
下一代的Vera C.鲁宾天文台将通过其空间和时间遗产调查（LSST）对静态和瞬态宇宙进行最先进的测量。有了这样的能力，在调查的广泛科学驱动因素中优化LSST观测策略是非常具有挑战性的。与LSST暗能量科学合作相关的LSST观测策略的许多方面，例如调查足迹定义，单次访问曝光时间以及不同过滤器中重复访问的节奏，尚未最终确定。在这里，我们提出的度量用于评估的影响，观测策略的宇宙学探测器被认为是最敏感的调查设计，这些是大尺度结构，弱透镜，Ia型超新星，kilonovae，和强透镜系统（以及光度红移，使许多这些探头）。我们评估这些指标超过100个不同的模拟潜在的调查设计。我们的研究结果表明，多种观测策略决策可以深刻影响LSST的宇宙学约束;这些策略包括调整观测足迹，确保在不同的过滤器中进行重复的夜间访问，以及执行定期的节奏。我们为我们的指标提供公共代码，这使得它们随时可用于评估对调查设计的进一步修改。最后，我们提出了一系列建议，并强调了需要进一步研究的观察战略因素。
The generation-defining Vera C. Rubin Observatory will make state-of-the-art measurements of both the static and transient universe through its Legacy Survey for Space and Time (LSST). With such capabilities, it is immensely challenging to optimize the LSST observing strategy across the survey’s wide range of science drivers. Many aspects of the LSST observing strategy relevant to the LSST Dark Energy Science Collaboration, such as survey footprint definition, single-visit exposure time, and the cadence of repeat visits in different filters, are yet to be finalized. Here, we present metrics used to assess the impact of observing strategy on the cosmological probes considered most sensitive to survey design; these are large-scale structure, weak lensing, type Ia supernovae, kilonovae, and strong lens systems (as well as photometric redshifts, which enable many of these probes). We evaluate these metrics for over 100 different simulated potential survey designs. Our results show that multiple observing strategy decisions can profoundly impact cosmological constraints with LSST; these include adjusting the survey footprint, ensuring repeat nightly visits are taken in different filters, and enforcing regular cadence. We provide public code for our metrics, which makes them readily available for evaluating further modifications to the survey design. We conclude with a set of recommendations and highlight observing strategy factors that require further research.