Addition of the Local Volume sample of galaxies from the FAST HI survey
Igor D. Karachentsev, Valentina E. Karachentseva, Serafim S. Kaisin, Chuan-Peng Zhang
arXiv:2404.07636v1 Announce Type: new
Abstract: 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 $7.8times 10^6~M_{odot}$ and a median HI mass of $1.0times 10^7~M_{odot}$. 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 ($2.7pm1.0)times10^{11}~M_{odot}$ on the projected scale of 90 kpc.arXiv:2404.07636v1 Announce Type: new
Abstract: 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 $7.8times 10^6~M_{odot}$ and a median HI mass of $1.0times 10^7~M_{odot}$. 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 ($2.7pm1.0)times10^{11}~M_{odot}$ on the projected scale of 90 kpc.