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Mock Observations for the CSST Mission:Main Surveys——The Slitless Spectroscopy Simulation 认领 引用
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作者 Xin Zhang Yue-Dong Fang +14 位作者 Cheng-Liang Wei Guo-Liang Li Feng-Shan Liu Hang-Xin Ji Hao Tian Nan Li Xian-Min Meng Jian-Jun Chen Xia Wang Rui Wang Chao Liu Zhong-Wen Hu Ran Li Peng Wei Jing Tang 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第2期40-48,共9页
The Chinese Space Station Survey Telescope(CSST),slated to become China's largest space-based optical telescope in the coming decade,is designed to conduct wide-field sky surveys with high spatial resolution.Among... The Chinese Space Station Survey Telescope(CSST),slated to become China's largest space-based optical telescope in the coming decade,is designed to conduct wide-field sky surveys with high spatial resolution.Among its key observational modes,slitless spectral observation allows simultaneous imaging and spectral data acquisition over a wide field of view,offering significant advantages for astrophysical studies.Currently,the CSST is in the development phase and lacks real observational data.As a result,the development of its data processing pipeline and scientific pre-research must rely on the mock data generated through simulations.This work focuses on developing a simulation framework for the CSST slitless spectral imaging system,analyzing its spectral dispersing properties and structural design.Additionally,the detection performance of the slitless spectral system is assessed for various astrophysical targets.Simulation results demonstrate that nearly all 1st order spectra are accompanied by corresponding 0th order images,facilitating accurate source identification.Furthermore,the GI spectral band exhibits superior detection efficiency compared to the GV and GU bands,establishing it as the primary observational band for stellar and galactic studies.This work successfully develops a simulation framework for the CSST slitless spectroscopic equipment. 展开更多
关键词 methods numerical-methods data analysis-techniques imaging spectroscopy-space vehicles instruments
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Zeroth-order Efficiency Optimization of the GI Grating for the CSST Slitless Spectrograph 认领 引用
2
作者 Nan Zhou Jia-Qi Wang +4 位作者 Ke-Qiang Qiu Zi-Chong Zhang Hang-Xin Ji Ru Chen Zhong-Wen Hu 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2026年第7期111-122,共12页
Redshift measurement uncertainty by direct reference of zeroth-order images of the Chinese Space Station SurveyTelescope slitless spectrograph GI gratings is evaluated.Total optical throughput ratio of the zeroth-orde... Redshift measurement uncertainty by direct reference of zeroth-order images of the Chinese Space Station SurveyTelescope slitless spectrograph GI gratings is evaluated.Total optical throughput ratio of the zeroth-order imagewith respect to its first order science photons is much lower for GI gratings compared with GU or GV gratings.Potential optimization of the GI gratings is investigated to enhance zeroth-order throughput withoutcompromising their first-order scientific performance.Rigorous Coupled-Wave Analysis shows that grooveprofiles optimization could boost a gain factor of 2.5 in GI band zeroth-order image photons while preserving itsfirst-order efficiency above 55%.Superior balance is achieved between centroid precision and spectral efficiency.Point source signal-to-noise ratio of 20–22 mag in the I band demonstrate significant boost in the zeroth-orderimage,yielding a centroid precision better than 0.353 pixels at 22 mag.A novel optimization strategy of gratingparameters is reported as well. 展开更多
关键词 instrumentation:spectrographs methods:numerical stars:imaging
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The Coude Echelle Spectrograph for the Lijiang 1.8 m telescope 认领 引用
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作者 Xiao-Li Wang Liang Chang +14 位作者 Lei Wang Hang-Xin Ji Hao Xian Zhen Tang Yu-Xin Xin Chuan-Jun Wang Shou-Sheng He Ju-Jia Zhang Bao-Li Lun Kai Wei Xi-Qi Li Xiao-Jun Jiang Hui-Juan Wang Hong-Bin Li Ji-Rong Mao 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2020年第3期76-83,共8页
The Coude Echelle Spectrograph(CES)was originally mounted on Xinglong 2.16 m telescope in 1994.When the High Resolution Fiber-fed Spectrograph(HRS)was commissioned at Xinglong 2.16 m telescope,the red path of CES was ... The Coude Echelle Spectrograph(CES)was originally mounted on Xinglong 2.16 m telescope in 1994.When the High Resolution Fiber-fed Spectrograph(HRS)was commissioned at Xinglong 2.16 m telescope,the red path of CES was moved to Lijiang 1.8 m telescope,following some redesign and reinstallation.The CES of Lijiang 1.8 m telescope has the spectral resolution(R=λ/?λ)ranging from 20000 to 50000 corresponding to different slit widths.With a 2 k×2 k PI CCD,CES has a wavelength coverage between 570 nm to 1030 nm.In particular,the resolution of 37000 at 0.5 mm slit corresponds to 1.3′′on the sky.The limiting magnitude is V=11.5 with the use of the tip-tilt feedback system,and the S/N is about 40 for 1 hour exposure at 600 nm(R=37000).During the installation of CES,the tip-tilt mirror technology had successfully fulfilled high precision guiding and tracking for high resolution spectral observation and significantly improved the observation efficiency. 展开更多
关键词 Instrumentation:spectrographs methods:observational techniques:spectroscopic
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