Local Group dwarf galaxy detection limit in the <i>CSST</i> survey

ABSTRACT We predict the dwarf galaxy detection limits for upcoming Chinese Space Station Telescope (CSST) survey that will cover 17 500 ${\rm \, deg}^{2}$ of sky with a wide field view 1.1 deg2. The point-source depth reaches 26.3 mag in g band and 25.9 i band. Constructing mock data based on designed photometric bands, we estimate recovery rate artificial galaxies from catalogues. these is strongly dependent their distance, magnitude, size, agreement searches current surveys. expect CSST to enable MV = −3.0 μ250 32.0 arcsec−2 (surface brightness limit system half-light radius rh 250 pc}$) at $400 {\rm kpc}$, −4.9 30.5 around Andromeda galaxy. Beyond Local Group, achieve −5.8, 29.7 distance range 1–2 Mpc, opening up an exciting discovery space faint galaxies. With its optical footprint, resolution, undoubtedly expand our knowledge low-mass unprecedented volume.