CSST large-scale structure analysis pipeline: II. The CSST Emulator for Slitless Spectroscopy

Author:

Wen Run12ORCID,Zheng Xian Zhong12ORCID,Han Yunkun3,Yang Xiaohu45,Wang Xin67,Zou Hu7,Liu Fengshan678,Zhang Xin78,Zu Ying4ORCID,Shi Dong Dong1,Gu Yizhou4ORCID,Wang Yirong4ORCID

Affiliation:

1. Purple Mountain Observatory, Chinese Academy of Sciences , 10 Yuanhua Road, Nanjing 210023 , China

2. School of Astronomy and Space Science, University of Science and Technology of China , Hefei 230026 , China

3. Yunnan Observatories, Chinese Academy of Sciences , 396 Yangfangwang, Guandu District, Kunming 650216 , China

4. Department of Astronomy, School of Physics and Astronomy, Shanghai Jiao Tong University , Shanghai 200240 , China

5. Tsung-Dao Lee Institute and Key Laboratory for Particle Physics, Astrophysics and Cosmology, Ministry of Education , Shanghai 201210 , China

6. School of Astronomy and Space Science, University of Chinese Academy of Sciences (UCAS) , Beijing 100049 , China

7. National Astronomical Observatories, Chinese Academy of Sciences , 20A Datun Road, Chaoyang District, Beijing 100101 , China

8. Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , 20A Datun Road, Chaoyang District, Beijing 100101 , China

Abstract

ABSTRACT The Chinese Space Station Telescope (CSST) slitless spectroscopic survey will observe objects to a limiting magnitude of ∼23 mag (5σ, point sources) in U, V, and I over 17 500 deg2. The spectroscopic observations are expected to be highly efficient and complete for mapping galaxies over 0 < z < 1 with secure redshift measurements at spectral resolutions of R ∼ 200, providing unprecedented data sets for cosmological studies. To quantitatively examine the survey potential, we develop a software tool, namely the CSST Emulator for Slitless Spectroscopy (CESS), to quickly generate simulated 1D slitless spectra with limited computing resources. We introduce the architecture of CESS and the detailed process of creating simulated CSST slitless spectra. The extended light distribution of a galaxy induces the self-broadening effect on the 1D slitless spectrum. We quantify the effect using morphological parameters: Sérsic index, effective radius, position angle, and axis ratio. Moreover, we also develop a module for CESS to estimate the overlap contamination rate for CSST grating observations of galaxies in galaxy clusters. Applying CESS to the high-resolution model spectra of a sample of ∼140 million galaxies with mz < 21 mag selected from the Dark Energy Spectroscopic Instrument LS DR9 catalogue, we obtain the simulated CSST slitless spectra. We examine the dependence of measurement errors on different types of galaxies due to instrumental and observational effects and quantitatively investigate the redshift completeness for different environments out to z ∼ 1. Our results show that the CSST spectroscopy is able to provide secure redshifts for about one-quarter of the sample galaxies.

Funder

National Science Foundation of China

Publisher

Oxford University Press (OUP)

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