arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1503.01113astro-ph.CO
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I.苹果对苹果$A^2$:下一代巡天的真实星系模拟星表和光度红移预测

I. Apples to apples $A^2$: realistic galaxy simulated catalogs and photometric redshift predictions for next-generation surveys

Begoña Ascaso, Simona Mei, Narciso Benítez

摘要:

我们提出了新的模拟目录的两个最大的第四阶段下一代调查在光学和红外:LSST和欧几里得,基于N体模拟+半解析锥后修改与\texttt{PhotReal}。该技术通过使用光谱模板的经验库来修改原始测光,以使其更真实。通过与实测数据的比较,验证了星表的可靠性。还提供了不同调查的预期光度红移之间的一致比较。欧几里德等极深近红外巡天将提供非常好的性能($Δz/(1+z) \sim 0.025-0.053$)低至$H\sim24$ AB等,高至$z\sim3$,这取决于地面的光学观测,而极深的光学勘测,如LSST,将获得总体较低的光度学红移分辨率($Δz/(1+z) \sim 0.045$)降至$i\sim27.5$ AB mag,得到了很大的改善($Δz/(1+z) \sim 0.035$)如果我们将样本限制在i $\sim$ 24 AB等,那么这些数字可以通过选择具有最佳质量光度的星系子样本来大幅提升红移最后,我们讨论的影响,这些调查将对社会的光度红移遗产。这是一系列论文中的第一篇,我们在其中为模拟目录和观测之间的可比性建立了一个框架,特别侧重于聚类调查。Euclid和LSST模拟可在以下链接中公开获得:www.example.com。

英文摘要:

We present new mock catalogues for two of the largest stage-IV next-generation surveys in the optical and infrared: LSST and Euclid, based on an N-body simulation+semi-analytical cone with a posterior modification with \texttt{PhotReal}. This technique modifies the original photometry by using an empirical library of spectral templates to make it more realistic. The reliability of the catalogues is confirmed by comparing the obtained color-magnitude relation, the luminosity and mass function and the angular correlation function with those of real data. Consistent comparisons between the expected photometric redshifts for different surveys are also provided. Very deep near infrared surveys such as Euclid will provide very good performance ($Δz/(1+z) \sim 0.025-0.053$) down to $H\sim24$ AB mag and up to $z\sim3$ depending on the optical observations available from the ground whereas extremely deep optical surveys such as LSST will obtain an overall lower photometric redshift resolution ($Δz/(1+z) \sim 0.045$) down to $i\sim27.5$ AB mag, being considerably improved ($Δz/(1+z) \sim 0.035$) if we restrict the sample down to i$\sim$24 AB mag. Those numbers can be substantially upgraded by selecting a subsample of galaxies with the best quality photometric redshifts. We finally discuss the impact that these surveys will have for the community in terms of photometric redshift legacy. This is the first of a series of papers where we set a framework for comparability between mock catalogues and observations with a particular focus on cluster surveys. The Euclid and LSST mocks are made publicly available in the following link: http://photmocks.obspm.fr/.

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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