Addition of the Local Volume sample of galaxies from the FAST HI survey
Astronomy & Astrophysics(2024)
摘要
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 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 these groups to be (2.7±1.0)×10^11 M_⊙
on the projected scale of 90 kpc.
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