Journal Article

Testing photometric redshift measurements with filter definition of the Chinese Space Station Optical Survey (CSS-OS)

Ye Cao, Yan Gong, Xian-Min Meng, Cong K Xu, Xuelei Chen, Qi Guo, Ran Li, Dezi Liu, Yongquan Xue, Li Cao, Xiyang Fu, Xin Zhang, Shen Wang and Hu Zhan

in Monthly Notices of the Royal Astronomical Society

Published on behalf of Royal Astronomical Society

Volume 480, issue 2, pages 2178-2190
ISSN: 0035-8711
Published online July 2018 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1093/mnras/sty1980
Testing photometric redshift measurements with filter definition of the Chinese Space Station Optical Survey (CSS-OS)

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ABSTRACT

The Chinese Space Station Optical Survey (CSS-OS) is a major science project of the Space Application System of the China Manned Space Program. This survey is planned to perform both photometric imaging and slitless spectroscopic observations, and it will focus on different cosmological and astronomical goals. Most of these goals are tightly dependent on the accuracy of photometric redshift (photo-z) measurement, especially for the weak gravitational lensing survey as a main science driver. In this work, we assess if the current filter definition can provide accurate photo-z measurement to meet the science requirement. We use the COSMOS galaxy catalogue to create a mock catalogue for the CSS-OS. We compare different photo-z codes and fitting methods that use the spectral energy distribution template-fitting technique, and choose to use a modified lephare code in photo-z fitting process. Then we investigate the CSS-OS photo-z accuracy in certain ranges of filter parameters, such as band position, width, and slope. We find that the current CSS-OS filter definition can achieve reasonably good photo-z results with σz ∼ 0.02 and outlier fraction ∼3 per cent.

Keywords: cosmology: observations; large-scale structure of universe

Journal Article.  8839 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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