Addition of the Local Volume sample of galaxies from the FAST HI survey,Astronomy & Astrophysics

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Addition of the Local Volume sample of galaxies from the FAST HI survey
Astronomy & Astrophysics ( IF 5.4 ) Pub Date : 2024-04-25 , DOI: 10.1051/0004-6361/202449672
Igor D. Karachentsev , Valentina E. Karachentseva , Serafim S. Kaisin , Chuan-Peng Zhang

We report the discovery of 20 new dwarf galaxies in the Local Volume identified as optical counterparts to the Five-hundred-meter Aperture Spherical radio Telescope (FAST) All Sky HI Survey (FASHI) sources. The galaxies have a median stellar mass of 7.8 × 10^{6^{M_{⊙_{and a median HI mass of 1.0 × 10^{7^{M_{⊙_{. Most of them are field galaxies, while three are probable members of the M 101 and M 106 groups. We also found seven FASHI radio sources to be probable dark HI clouds in nearby groups. Together with four other known HI clouds in the local groups, their mean-square radial velocity difference of 49 km s^{−1^{with respect to the host galaxies yields an average total mass of (2.7 ± 1.0)×10^{11^{M_{⊙_{for these groups on the projected scale of 90 kpc.}}}}}}}}}}}}}}

中文翻译：

添加来自 FAST HI 巡天的星系局部体积样本

我们报告在局域体积中发现了 20 个新的矮星系，这些星系被确定为 500 米孔径球面射电望远镜 (FAST) 全天 HI 巡天 (FASHI) 源的光学对应物。这些星系的恒星质量中位数为 7.8 × 10 ^{6 ^M^_⊙^{_{_{，HI 质量中位数为 1.0 × 10}}}^_{_⁷}^{_{_^{^M}}}^{_{_{^{^_⊙}}}}^{_{_{^{^{_{_{。其中大多数是场星系，其中三个可能是 M 101 和 M 106 星系团的成员。我们还发现七个 FASHI 射电源可能是附近群中的暗 HI 云。与本地群中其他四个已知的 HI 云一起，它们}}}}}}}^{_{_{^{^{_{_{^{^{相对于宿主星系的}}}}}}}}}^{_{_{^{^{_{_{均方径向速度差为 49 km s}}}}}}}^{_{_{^{^{_{_{^{-1 ，得出}}}}}}}}^{_{_{^{^{_{_{^{^{^{^{_{_这些群的}}}}}}}}}}}}^{_{_{^{^{_{_{^{^{^{平均总质量为 (2.7 ± 1.0)×10 11}}}}}}}}}}^{_{_{^{^{_{_^{^{^{^M}}}}}}}}}^{_{_{^{^{_{_{^{^{^{^_⊙}}}}}}}}}}^{_{_{^{^{_{_{^{^{^{^{_{_{预计规模为 90 kpc。}}}}}}}}}}}}}}

更新日期：2024-04-25

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