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The China Space Station Telescope (CSST) photometric survey aims to perform ahigh spatial resolution (~0.15'') photometric imaging for the targets thatcover a large sky area (~17,500 deg^2) and wide wavelength range (from NUV toNIR). It expects to explore the properties of dark matter, dark energy, andother important cosmological and astronomical areas. In this work, we evaluatewhether the filter design of the Multi-channel Imager (MCI), one of the fiveinstruments of the CSST, can provide accurate photometric redshift (photo-z)measurements with its nine medium-band filters to meet the relevant scientificobjectives. We generate the mock data based on the COSMOS photometric redshiftcatalog with astrophysical and instrumental effects. The application of upperlimit information of low signal-to-noise ratio (SNR) data is adopted in theestimation of photo-z. We investigate the dependency of photo-z accuracy on thefilter parameters, such as band position and width. We find that the currentMCI filter design can achieve good photo-z measurements with accuracysigma_z~0.017 and outlier fraction f_c~2.2%. It can effectively improve thephoto-z measurements of the main CSST survey using the Survey Camera (SC) to anaccuracy sigma_z~0.015 and outlier fraction f_c~1.5%. It indicates that theoriginal MCI filters are proper for the photo-z calibration.

Calibrating photometric redshift measurements with the Multi-channel Imager (MCI) of the China Space Station Telescope (CSST)