2025PASP..137f4101L

The Chinese Space Station Telescope (CSST) is China's upcoming next-generation ultraviolet and optical survey telescope, with imaging resolution capabilities comparable to the Hubble Space Telescope (HST). In this study, we utilized a comprehensive sample of 3679 CSST realistic mock galaxies constructed from HST Cosmic Assembly Near-infrared Deep Extragalactic Legacy Survey/GOODS-North deep imaging observations, with stellar masses $\mathrm{log}\left({M}_{* }/{M}_{\odot }\right)\gt 9.0$ and redshifts z < 2. We evaluate the detection capabilities of CSST surveys and the accuracy in measuring the non-parametric morphological indicators (C, A, Gini, M₂₀, A_O, D_O) of galaxies. Our findings show that in terms of galaxy detection capabilities, CSST's deep field surveys can achieve the same level as HST's deep field observations; however, in wide-field surveys, CSST exhibits a significant deficiency in detecting high-redshift, low-mass, low-surface-brightness galaxies. Regarding the measurement of galaxy morphology, CSST's deep field surveys achieve high accuracy across all indicators except for the asymmetry indicator (A), whereas its wide-field surveys suffer from significant systematic biases. We thus provide simple correction functions to adjust the non-parametric morphological indicators obtained from CSST's wide-field and deep-field observations, thereby aligning CSST measurements with those from HST. This adjustment enables the direct application of non-parametric morphological classification methods originally developed for HST data to galaxies observed by CSST.