<i>CSST</i> large scale structure analysis pipeline: III. Emission-line redshift measurement for slitless spectra

doi:10.1093/mnras/staf304

	CSST large scale structure analysis pipeline: III. Emission-line redshift measurement for slitless spectra
	Sui, Jipeng 1,2; Zou, Hu 1,2; Yang, Xiaohu 3,4,5; Zheng, Xianzhong 6,7; Wen, Run 6,7; Gu, Yizhou 4,5; Ding, Weiyu 1,7,8; Feng, Lu 1; Guo, Hong 9; Guo, Wei-Jian 1; Han, Yunkun 10; Jing, Yipeng 3,4,5; Li, Cheng 11; Li, Wenxiong 1; Liu, Shufei 1,2; Shen, Zhixia 1; Singh, Gaurav 1; Wang, Jiali 1; Wei, Peng12 ; Xiao, Yunao 1,2; Xue, Suijian 1; Zhan, Hu 13,14; Zhang, Pengjie 3,4,5; Zhao, Gongbo 1,2
	2025-03-04
Source Publication	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN	0035-8711
Volume	538 Issue:1 Pages:395-407
Contribution Rank	11
Abstract	The China Space Station Telescope (CSST) is a forthcoming space-based optical telescope designed to co-orbit with the Chinese Space Station. With a planned slitless spectroscopic survey spanning a broad wavelength range of 255-1000 nm and an average spectral resolution exceeding 200, the CSST holds significant potential for cosmic large-scale structure analysis. In this study, we focus on redshift determinations from slitless spectra through emission line analysis within the CSST framework. Our tailored redshift measurement process involves identifying emission lines in one-dimensional slitless spectra, aligning observed wavelengths with their rest-frame counterparts from prominent galaxy emissions, and calculating wavelength shifts to determine redshifts accurately. To validate our redshift measurement algorithm, we leverage simulated spectra generated by the CSST emulator for slitless spectroscopy. The outcomes demonstrate a remarkable redshift completeness exceeding 95 per cent for emission line galaxies (ELGs), alongside a purity surpassing 85 per cent. The redshift uncertainty remains impressively below than similar to 0.001. Notably, when concentrating on galaxies with more than three matched emission lines, the completeness of ELGs and the purity of measurable galaxies can reach 98 per cent and 97 per cent, respectively. Furthermore, we explore the influence of parameters like magnitude, spectral signal-to-noise ratio, and redshift on redshift completeness and purity. The discussion also delves into redshift degeneracies stemming from emission-line matching confusion. Our developed redshift measurement process will be applied to extensive simulated data sets and forthcoming CSST slitless spectroscopic observations for further cosmological and extragalactic analyses.
Keyword	methods: data analysis galaxies: distances and redshifts galaxies: general quasars: emission lines cosmology: observations
DOI	10.1093/mnras/staf304
Indexed By	SCI
Language	英语
WOS Keyword	STELLAR POPULATION SYNTHESIS ; GALAXY ; SPACE
Funding Project	National Key R&D Program of China[2023YFA1607800] ; National Key R&D Program of China[2022YFA1602902] ; National Key R&D Program of China[2023YFA1607804] ; National Key R&D Program of China[2023YFA1608100] ; National Key R&D Program of China[2023YFF0714800] ; National Key R&D Program of China[2022YFF0503400] ; National Key R&D Program of China[12120101003] ; National Key R&D Program of China[12373010] ; National Key R&D Program of China[12173051] ; National Key R&D Program of China[12233008] ; National Natural Science Foundation of China[1222028] ; Beijing Municipal Natural Science Foundation[CMS-CSST-2021-A02] ; Beijing Municipal Natural Science Foundation[CMS-CSST-2021-A04] ; Beijing Municipal Natural Science Foundation[CMS-CSST-2021-A05] ; Beijing Municipal Natural Science Foundation[CMS-CSST-2021-B01] ; China Manned Space Project[XDB0550100] ; China Manned Space Project[XDB0550000] ; Strategic Priority Research Programme of the Chinese Academy of Sciences
WOS Research Area	Astronomy & Astrophysics
WOS Subject	Astronomy & Astrophysics
WOS ID	WOS:001437619100001
Publisher	OXFORD UNIV PRESS
Funding Organization	National Key R&D Program of China ; National Key R&D Program of China ; National Natural Science Foundation of China ; Beijing Municipal Natural Science Foundation ; China Manned Space Project ; Strategic Priority Research Programme of the Chinese Academy of Sciences
Citation statistics
Document Type	期刊论文
Identifier	http://ir.xao.ac.cn/handle/45760611-7/7473
Collection	光学天文与技术应用研究室_星团与星系研究团组
Corresponding Author	Zou, Hu
Affiliation	1.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100101, Peoples R China 2.Univ Chinese Acad Sci, Sch Astron & Space Sci, Beijing 101408, Peoples R China 3.Shanghai Jiao Tong Univ, Sch Phys & Astron, Dept Astron, Shanghai 200240, Peoples R China 4.Shanghai Jiao Tong Univ, Tsung Dao Lee Inst, Minist Educ, Shanghai 201210, Peoples R China 5.Shanghai Jiao Tong Univ, Key Lab Particle Phys Astrophys & Cosmol, Minist Educ, Shanghai 201210, Peoples R China 6.Chinese Acad Sci, Purple Mt Observ, 10 Yuanhua Rd, Nanjing 210023, Peoples R China 7.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China 8.Univ Sci & Technol China, Dept Astron, Deep Space Explorat Lab, Hefei 230026, Peoples R China 9.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 10.Chinese Acad Sci, Yunnan Observ, 396 Yangfangwang, Kunming 650216, Peoples R China 11.Tsinghua Univ, Dept Astron, Beijing 100084, Peoples R China 12.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi 830011, Xinjiang, Peoples R China 13.Chinese Acad Sci, Key Lab Space Astron & Technol, Natl Astron Observ, Beijing 100101, Peoples R China 14.Peking Univ, Kavli Inst Astron & Astrophys, Beijing 100871, Peoples R China
Recommended Citation GB/T 7714	Sui, Jipeng,Zou, Hu,Yang, Xiaohu,et al. CSST large scale structure analysis pipeline: III. Emission-line redshift measurement for slitless spectra[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2025,538(1):395-407.
APA	Sui, Jipeng.,Zou, Hu.,Yang, Xiaohu.,Zheng, Xianzhong.,Wen, Run.,...&Zhao, Gongbo.(2025).CSST large scale structure analysis pipeline: III. Emission-line redshift measurement for slitless spectra.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,538(1),395-407.
MLA	Sui, Jipeng,et al."CSST large scale structure analysis pipeline: III. Emission-line redshift measurement for slitless spectra".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 538.1(2025):395-407.

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