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典型文献
Calibrating Photometric Redshift Measurements with the Multi-channel Imager(MCI)of the China Space Station Telescope(CSST)
文献摘要:
The China Space Station Telescope(CSST)photometric survey aims to perform a high spatial resolution(~0″.15)photometric imaging for the targets that cover a large sky area(~17,500 deg2)and wide wavelength range(from NUV to NIR).It expects to explore the properties of dark matter,dark energy,and other important cosmological and astronomical areas.In this work,we evaluate whether the filter design of the Multi-channel Imager(MCI),one of the five instruments of the CSST,can provide accurate photometric redshift(photoz)measurements with its nine medium-band filters to meet the relevant scientific objectives.We generate the mock data based on the COSMOS photometric redshift catalog with astrophysical and instrumental effects.The application of upper limit information of low signal-to-noise ratio data is adopted in the estimation of photoz.We investigate the dependency of photoz accuracy on the filter parameters,such as band position and width.We find that the current MCI filter design can achieve good photoz measurements with accuracy σz ? 0.017 and outlier fraction fc ? 2.2%.It can effectively improve the photoz measurements of the main CSST survey using the Survey Camera to an accuracy σz ? 0.015 and outlier fraction fc ? 1.5%.This indicates that the original MCI filters are proper for the photoz calibration.
文献关键词:
作者姓名:
Ye Cao;Yan Gong;Zhen-Ya Zheng;Chun Xu
作者机构:
Key Laboratory of Space Astronomy and Technology,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;School of Astronomy and Space Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Science Center for China Space Station Telescope,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;CAS Key Laboratory for Research in Galaxies and Cosmology,Shanghai Astronomical Observatory,Shanghai 200030,China;Division of Optical Astronomical Technologies,Shanghai Astronomical Observatory,Shanghai 200030,China;Joint Center of SHAO and SITP for Infrared Astronomical Instrumentation,Shanghai Astronomical Observatory,Shanghai 200030,China
引用格式:
[1]Ye Cao;Yan Gong;Zhen-Ya Zheng;Chun Xu-.Calibrating Photometric Redshift Measurements with the Multi-channel Imager(MCI)of the China Space Station Telescope(CSST))[J].天文和天体物理学研究,2022(02):204-214
A类:
Redshift,deg2,photoz
B类:
Calibrating,Photometric,Measurements,Multi,channel,Imager,MCI,China,Space,Station,Telescope,CSST,photometric,survey,aims,perform,high,spatial,resolution,imaging,targets,that,cover,large,sky,wide,wavelength,range,from,NUV,NIR,It,expects,explore,properties,dark,matter,energy,other,important,cosmological,astronomical,areas,In,this,work,we,evaluate,whether,design,one,five,instruments,can,provide,accurate,redshift,measurements,its,nine,medium,band,filters,meet,relevant,scientific,objectives,We,generate,mock,data,COSMOS,catalog,astrophysical,instrumental,effects,application,upper,limit,information,low,signal,noise,adopted,estimation,investigate,dependency,accuracy,parameters,such,position,width,find,current,achieve,good,outlier,fraction,fc,effectively,improve,main,using,Survey,Camera,This,indicates,original,calibration
AB值:
0.554161
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