Redshift Accuracy Requirements for Future Supernova and Number Count Surveys
Redshift Accuracy Requirements for Future Supernova and Number Count Surveys
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未来超新星和计数巡天的红移精度要求
DOI：
10.1086/424726
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
Tamara Broderick
中科院分区：
文献类型：
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作者：
D. Huterer;A. Kim;L. Krauss;Tamara Broderick
我们调查的红移精度的Ia型超新星和集群数计数调查所需的红移不确定性不明显的暗能量参数的误差预算。对于超新星/加速探测器实验，我们发现，如果没有地面测量的帮助，单个超新星的红移需要确定为约0.002或更好，这对低分辨率光谱仪来说是一个具有挑战性但可行的要求。然而，我们发现，精确的红移z < 0.1的超新星获得地面实验是足够的，以保护即使是相对较大的红移误差在高z的结果。对于未来的星系团数计数调查，如南极望远镜，普朗克，或DUET，我们发现，纯粹的统计误差在光度红移是不太重要的，在红移的不可约的系统偏差驱动的要求。红移偏差必须保持在0.001-0.005的范围内（由滤波器组决定），这取决于天空的覆盖范围和巡天最小质量的定义细节。此外，我们发现，X射线调查有一个更严格的要求红移精度比Sunyaev-Zeldovich（SZ）效应调查，因为他们使用一个较短的杠杆臂在红移;相反，SZ调查受益于他们的高红移范围，只要一些红移信息是可用于遥远的（z <$1）集群。
We investigate the redshift accuracy of Type Ia supernova and cluster number count surveys required for the redshift uncertainties not to contribute appreciably to the dark energy parameter error budget. For the Supernova/Acceleration Probe experiment, we find that without the assistance of ground-based measurements individual supernova redshifts would need to be determined to about 0.002 or better, a challenging but feasible requirement for a low-resolution spectrograph. However, we find that accurate redshifts for z < 0.1 supernovae obtained with ground-based experiments are sufficient to protect the results against even relatively large redshift errors at high z. For the future cluster number count surveys such as with the South Pole Telescope, Planck, or DUET, we find that the purely statistical error in the photometric redshift is less important and that the irreducible systematic bias in redshift drives the requirements. The redshift bias must be kept below 0.001-0.005 per redshift bin (which is determined by the filter set), depending on the sky coverage and details of the definition of the minimal mass of the survey. Furthermore, we find that X-ray surveys have a more stringent required redshift accuracy than Sunyaev-Zeldovich (SZ) effect surveys since they use a shorter lever arm in redshift; conversely, SZ surveys benefit from their high-redshift reach only as long as some redshift information is available for distant (z ≳ 1) clusters.