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arXiv 0708.0033astro-ph
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Ia型超新星精确测光红移的测量要求

Survey Requirements for Accurate and Precise Photometric Redshifts for Type Ia Supernovae

Yun Wang, Gautham Narayan, Michael Wood-Vasey

摘要:

本文提出了Wang(2007)提出的Ia型超新星(SNe Ia)光度红移的简单解析估算方法,并利用该方法对模拟的Ia型超新星数据进行了研究。我们发现,如果尘埃消光可以忽略不计,则在三个观测通带(riz)中具有良好采样的光曲线的Ia型超新星的z_phot精度(RMS[(z_phot-z_spec)/(1+z_spec)]<0.005)可能优于0.5%,峰值亮度处的信噪比为25。z_phot的相应偏倚((z_phot-z_spec)的平均值)为5.4 \times 10^{-4}。如果在riz双标架光变曲线中考虑尘埃消光,则z_phot的精度降低到4.4%,z_phot的偏差为8.0 \times 10^{-3}。添加g波段光变曲线可将z_phot的精度提高到2.5%,并将z_phot的偏差降低到-1.5 \times 10^{-3}。我们的研究结果有显着的影响,设计未来的光度调查SNe Ia从地面和空间望远镜。精确的测光红移提升了这种巡天的宇宙学效用。

英文摘要:

In this paper we advance the simple analytic photometric redshift estimator for Type Ia supernovae (SNe Ia) proposed by Wang (2007), and use it to study simulated SN Ia data. We find that better than 0.5% accuracy in z_phot (with RMS[(z_phot-z_spec)/(1+z_spec)]<0.005) is possible for SNe Ia with well sampled lightcurves in three observed passbands (riz) with a signal-to-noise ratio of 25 at peak brightness, if the extinction by dust is negligible. The corresponding bias in z_phot (the mean of (z_phot-z_spec)) is 5.4\times 10^{-4}. If dust extinction is taken into consideration in the riz observer-frame lightcurves, the accuracy in z_phot deteriorates to 4.4%, with a bias in z_phot of 8.0\times 10^{-3}. Adding the g band lightcurve improves the accuracy in z_phot to 2.5%, and reduces the bias in z_phot to -1.5\times 10^{-3}. Our results have significant implications for the design of future photometric surveys of SNe Ia from both ground and space telescopes. Accurate and precise photometric redshifts boost the cosmological utility of such surveys.

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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