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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Photometric redshifts for Hyper Suprime-Cam Subaru Strategic Program Data Release 1
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Photometric redshifts for Hyper Suprime-Cam Subaru Strategic Program Data Release 1

机译：Hyper Suprime-Cam Subaru战略计划数据发布1的光度红移

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Photometric redshifts are a key component of many science objectives in the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP). In this paper, we describe and compare the codes used to compute photometric redshifts for HSC-SSP, how we calibrate them, and the typical accuracy we achieve with the HSC five-band photometry (grizy). We introduce a new point estimator based on an improved loss function and demonstrate that it works better than other commonly used estimators. We find that our photo-z’s are most accurate at 0.2 ? zphot ? 1.5, where we can straddle the 4000?? break. We achieve σ[Δzphot/(1?+?zphot)]?～?0.05 and an outlier rate of about 15% for galaxies down to i?=?25 within this redshift range. If we limit ourselves to a brighter sample of i??24, we achieve σ?～?0.04 and ～8% outliers. Our photo-z's should thus enable many science cases for HSC-SSP. We also characterize the accuracy of our redshift probability distribution function (PDF) and discover that some codes over-/underestimate the redshift uncertainties, which has implications for N(z) reconstruction. Our photo-z products for the entire area in Public Data Release 1 are publicly available, and both our catalog products (such as point estimates) and full PDFs can be retrieved from the data release site, ?https://hsc-release.mtk.nao.ac.jp/?.
机译：光度红移是Hyper Suprime-Cam Subaru战略计划（HSC-SSP）中许多科学目标的关键组成部分。在本文中，我们描述并比较了用于计算HSC-SSP的光度红移的代码，如何校准它们以及使用HSC五波段光度法（典型）获得的典型精度。我们基于改进的损失函数引入了一种新的点估计器，并证明它比其他常用估计器更好地工作。我们发现photo-z的精确度为0.2？ zphot？ 1.5，我们可以跨越4000？打破。在这个红移范围内，当星系下降到i？=？25时，我们获得σ[Δzphot/（1？+？zphot）]？〜？0.05，离群率约为15％。如果将自己限制为i？<？24的明亮样本，则可达到σ？〜？0.04和〜8％的离群值。因此，我们的photo-z应该可以为HSC-SSP启用许多科学案例。我们还表征了红移概率分布函数（PDF）的准确性，并发现某些代码高估了/低估了红移不确定性，这对N（z）重建具有影响。我们在Public Data Release 1中用于整个区域的photo-z产品是公开可用的，并且我们的目录产品（例如点估计值）和完整的PDF都可以从数据发布网站？https：// hsc-release中检索到。 mtk.nao.ac.jp/?。

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