WFIRST超新星巡天的模拟和宇宙学约束的预报
Simulations of the WFIRST Supernova Survey and Forecasts of Cosmological Constraints
摘要：
WFIRST是2010年新世界、新视野十年巡天中排名最高的大型天基任务。它现在是美国宇航局的一项任务，计划在2020年代中期发射。一个主要的任务目标是通过多个探测器精确地限制暗能量的性质，包括Ia型超新星（SNe Ia）。在这里，我们提出了第一个现实的模拟的无线传感器网络调查的基础上，目前的硬件规格和使用开源工具。我们模拟SN光变曲线和光谱所看到的WFIRST宽场通道（WFC）成像仪和积分场通道（IFC）光谱仪，分别。我们研究了11个调查策略与不同的时间分配之间的WFC和IFC，其中两个是基于WFIRST科学定义团队，专门从IFC数据测量SN距离所描述的战略。我们传播统计和，至关重要的是，系统的不确定性，以预测暗能量工作组的品质因数（FoM）的每一个战略。在调查的战略中，我们发现最成功的是以世界粮食理事会为重点。然而，还需要进一步努力限制系统性，以充分优化国际金融公司的使用。即使没有对其他宇宙学探测器的改进，WFIRST SN调查也有可能将FoM从当前值增加一个数量级以上。虽然这里提出的调查策略还没有得到充分优化，这些初步的调查是一个重要的一步，在最终的硬件设计和执行的WFIRST任务的发展。
英文摘要：
The Wide Field InfraRed Survey Telescope (WFIRST) was the highest ranked large space-based mission of the 2010 New Worlds, New Horizons decadal survey. It is now a NASA mission in formulation with a planned launch in the mid-2020s. A primary mission objective is to precisely constrain the nature of dark energy through multiple probes, including Type Ia supernovae (SNe Ia). Here, we present the first realistic simulations of the WFIRST SN survey based on current hardware specifications and using open-source tools. We simulate SN light curves and spectra as viewed by the WFIRST wide-field channel (WFC) imager and integral-field channel (IFC) spectrometer, respectively. We examine 11 survey strategies with different time allocations between the WFC and IFC, two of which are based upon the strategy described by the WFIRST Science Definition Team, which measures SN distances exclusively from IFC data. We propagate statistical and, crucially, systematic uncertainties to predict the Dark Energy Task Force figure of merit (FoM) for each strategy. Of the strategies investigated, we find the most successful to be WFC-focused. However, further work in constraining systematics is required to fully optimize the use of the IFC. Even without improvements to other cosmological probes, the WFIRST SN survey has the potential to increase the FoM by more than an order of magnitude from the current values. Although the survey strategies presented here have not been fully optimized, these initial investigations are an important step in the development of the final hardware design and implementation of the WFIRST mission.
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