TOPz：J-PAS的测光红移
TOPz: Photometric redshifts for J-PAS
摘要：
光度星系红移估计的重要性正在迅速增加的专业强大的观测设施的发展。我们开发了一个新的光度红移估计工作流程TOPz提供可靠和有效的红移估计为即将到来的大规模调查J-PAS将观察8500度2的北方天空通过54个窄带滤波器。TOPz依赖于基于模板的photo-z估计，具有一些添加的J-PAS特定功能和可能性。我们目前的TOPz性能的数据从miniJPAS调查，一个先驱的J-PAS调查具有相同的过滤系统。首先，我们使用合成星系光谱生成软件CIGALE的miniJPAS源的基础上生成的光谱模板。然后，我们通过最小化每个滤波器中的模板通量的系统偏移来对输入测光进行校正。为了评估红移估计的准确性，我们使用了1989年r < 22 magAB的miniJPAS星系的DEEP 2、DEEP 3和SDSS巡天的光谱红移。我们还测试了输入模板的选择和数量，photo-z先验和光度校正如何影响TOPz红移精度。miniJPAS数据和TOPz工作流程的组合的总体性能满足了对J-PAS红移精度的期望。与之前的估计类似，我们发现38.6%的r < 22等的星系达到了J-PAS红移精度目标dz/（1 + z）< 0.003。限制模板集合中的光谱数量可以将红移精度提高到5%，特别是对于较暗的噪声占主导地位的源。一旦得到实际的联合考绩制度数据，就有可能进一步改进。
英文摘要：
The importance of photometric galaxy redshift estimation is rapidly increasing with the development of specialised powerful observational facilities. We develop a new photometric redshift estimation workflow TOPz to provide reliable and efficient redshift estimations for the upcoming large-scale survey J-PAS which will observe 8500 deg2 of the northern sky through 54 narrow-band filters. TOPz relies on template-based photo-z estimation with some added J-PAS specific features and possibilities. We present TOPz performance on data from the miniJPAS survey, a precursor to the J-PAS survey with an identical filter system. First, we generated spectral templates based on the miniJPAS sources using the synthetic galaxy spectrum generation software CIGALE. Then we applied corrections to the input photometry by minimising systematic offsets from the template flux in each filter. To assess the accuracy of the redshift estimation, we used spectroscopic redshifts from the DEEP2, DEEP3, and SDSS surveys, available for 1989 miniJPAS galaxies with r < 22 magAB. We also tested how the choice and number of input templates, photo-z priors, and photometric corrections affect the TOPz redshift accuracy. The general performance of the combination of miniJPAS data and the TOPz workflow fulfills the expectations for J-PAS redshift accuracy. Similarly to previous estimates, we find that 38.6% of galaxies with r < 22 mag reach the J-PAS redshift accuracy goal of dz/(1 + z) < 0.003. Limiting the number of spectra in the template set improves the redshift accuracy up to 5%, especially for fainter, noise-dominated sources. Further improvements will be possible once the actual J-PAS data become available.
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