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arXiv 1409.8562astro-ph.CO
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利用欧几里得空间任务将超新星哈勃图扩展到z~1.5

Extending the supernova Hubble diagram to z~1.5 with the Euclid space mission

P. Astier, C. Balland, M. Brescia, E. Cappellaro, R. G. Carlberg, S. Cavuoti, M. Della Valle, E. Gangler, A. Goobar, J. Guy, D. Hardin, I. M. Hook, R. Kessler, … 展开作者

P. Astier, C. Balland, M. Brescia, E. Cappellaro, R. G. Carlberg, S. Cavuoti, M. Della Valle, E. Gangler, A. Goobar, J. Guy, D. Hardin, I. M. Hook, R. Kessler, A. Kim, E. Linder, G. Longo, K. Maguire, F. Mannucci, S. Mattila, R. Nichol, R. Pain, N. Regnault, S. Spiro, M. Sullivan, C. Tao, M. Turatto, X. F. Wang, W. M. Wood-Vasey

摘要:

我们预测暗能量的限制,可以从一个新的大样本的Ia型超新星,在高红移的欧几里得空间任务获得。我们模拟了一个三管齐下的SN调查:一个z<0.35的附近样本(8000 SNe),一个0.2<z<0.95的中间样本(8800 SNe),和一个0.75<z<1.55的高z样本(1700 SNe)。附近和中间的调查被认为是从地面进行的,而高Z是一个联合的地面和空间为基础的调查。这后一项调查,“暗能量超新星超新星-红色实验”(SAMRE),旨在适应在6个月内的欧几里得观测时间,有一个专门的观测计划。我们模拟了SN事件,因为它们将被各种仪器在滚动搜索模式下观察到,并推导出预期宇宙学约束的质量。我们占已知的系统的不确定性,特别是校准的不确定性,包括他们的贡献,通过训练的超新星模型用于拟合超新星的光变曲线。使用保守的假设和1-D几何普朗克先验,我们发现,合奏的调查将产生竞争性的限制:一个常数的状态方程参数可以被约束到sigma(w)=0.022,和一个暗能量任务组的品质因数203被发现的两个参数的状态方程。因此,我们的模拟表明,欧几里德可以通过将高质量的SN哈勃图扩展到z~1.5,为纯粹的几何宇宙学约束做出重大贡献。我们还提出了其他科学主题启用的Euclid观测

英文摘要:

We forecast dark energy constraints that could be obtained from a new large sample of Type Ia supernovae where those at high redshift are acquired with the Euclid space mission. We simulate a three-prong SN survey: a z<0.35 nearby sample (8000 SNe), a 0.2<z<0.95 intermediate sample (8800 SNe), and a 0.75<z<1.55 high-z sample (1700 SNe). The nearby and intermediate surveys are assumed to be conducted from the ground, while the high-z is a joint ground- and space-based survey. This latter survey, the "Dark Energy Supernova Infra-Red Experiment" (DESIRE), is designed to fit within 6 months of Euclid observing time, with a dedicated observing program. We simulate the SN events as they would be observed in rolling-search mode by the various instruments, and derive the quality of expected cosmological constraints. We account for known systematic uncertainties, in particular calibration uncertainties including their contribution through the training of the supernova model used to fit the supernovae light curves. Using conservative assumptions and a 1-D geometric Planck prior, we find that the ensemble of surveys would yield competitive constraints: a constant equation of state parameter can be constrained to sigma(w)=0.022, and a Dark Energy Task Force figure of merit of 203 is found for a two-parameter equation of state. Our simulations thus indicate that Euclid can bring a significant contribution to a purely geometrical cosmology constraint by extending a high-quality SN Hubble diagram to z~1.5. We also present other science topics enabled by the DESIRE Euclid observations

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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