论文标题
CSST调查中的本地组矮星系检测极限
Local Group Dwarf Galaxy Detection Limit in the CSST survey
论文作者
论文摘要
我们预测即将到来的中国空间站望远镜（CSST）调查的矮星系检测极限，该调查将涵盖天空的17,500 ver $^{2} $，其视野为1.1度$^2 $。点源深度在$ g $ band中达到26.3 mag，在$ i $ $ band中达到25.9 mag。根据设计的光度带构建模拟调查数据，我们估计了模拟点源光度目录中的人造矮星系的恢复速率。与当前调查中的搜索一致，对这些人造矮星系的检测很大程度上取决于它们的距离，大小和大小。我们希望CSST能够以$ m_v = -3.0 $和$μ__{250} = 32.0 $ mag/arcsec $^2 $（半光线半径$ r _ {\ rm h} $ = 250 $ __ $ MM_____________9， 30.5 $ mag/arcsec $^2 $在当地组以外的仙女座银河系周围。解决方案，CSST无疑将我们对低质量矮星系的知识扩大到前所未有的批量。
We predict the dwarf galaxy detection limits for the upcoming Chinese Space Station Telescope (CSST) survey that will cover 17,500 deg$^{2}$ of the sky with a wide field of view of 1.1 deg$^2$. The point-source depth reaches 26.3 mag in the $g$ band and 25.9 mag in the $i$ band. Constructing mock survey data based on the designed photometric bands, we estimate the recovery rate of artificial dwarf galaxies from mock point-source photometric catalogues. The detection of these artificial dwarf galaxies is strongly dependent on their distance, magnitude and size, in agreement with searches in current surveys. We expect CSST to enable the detection of dwarf galaxies with $M_V = -3.0$ and $μ_{250} = 32.0$ mag/arcsec$^2$ (surface-brightness limit for a system of half-light radius $r_{\rm h}$ = 250 pc at 400 kpc, and $M_V = -4.9$ and $μ_{250} = 30.5$ mag/arcsec$^2$ around the Andromeda galaxy. Beyond the Local Group, the CSST survey will achieve $M_V = -5.8$, and $μ_{250}$ = 29.7 mag/arcsec$^2$ in the distance range of 1--2 Mpc, opening up an exciting discovery space for faint field dwarf galaxies. With its optical bands, wide survey footprint, and space resolution, CSST will undoubtedly expand our knowledge of low-mass dwarf galaxies to an unprecedented volume.
