论文标题
南部银河杆附近的新冷溪
A New Cold Stream near the Southern Galactic Pole
论文作者
论文摘要
我们报告了在$ GAIA $ $ $早期数据发行3中检测到的南部银河杆（称为SGP-S）附近的冷溪的发现。该流的HeliIpentric距离为$ \ sim $ 9.5 kpc，跨度近58美元$^\ circ $ circ $ by 0.6 $^\^\ circ $ circ on Sky on Sky on Sky on Sky。 SGP-S的Colour-Magnitude图表示旧的和金属贫困（年龄$ \ sim $ 12 Gyr，[m/h] $ \ sim $ -2.0 dex）恒星种群。该流的表面亮度达到了$σ_g\ simeq $ 36.2 mag arcsec $^{ - 2} $的极低水平。现存的球状簇和其他已知流都不与SGP-S相关。
We report the discovery of a cold stream near the southern Galactic pole (dubbed as SGP-S) detected in $Gaia$ Early Data Release 3. The stream is at a heliocentric distance of $\sim$ 9.5 kpc and spans nearly 58$^\circ$ by 0.6$^\circ$ on sky. The colour-magnitude diagram of SGP-S indicates an old and metal-poor (age $\sim$ 12 Gyr, [M/H] $\sim$ -2.0 dex) stellar population. The stream's surface brightness reaches an exceedingly low level of $Σ_G \simeq$ 36.2 mag arcsec$^{-2}$. Neither extant globular clusters nor other known streams are associated with SGP-S.
