Optical identification of the FASHI sources: toward the extended Local Volume
Aleksandra E. Nazarova, Dmitry I. Makarov, Igor D. Karachentsev, Chuan-Peng Zhang, Maksim I. Chazov + 1 more
TLDR
Researchers identified 662 FASHI HI sources, discovering 71 new dwarf irregular galaxies within 16 Mpc, expanding the Local Volume.
Key contributions
- Extracted 662 nearby HI-detection sources from the FASHI survey.
- Visually identified optical counterparts for 662 FASHI HI sources.
- Discovered 71 new dwarf irregular galaxies with ongoing star formation.
- Characterized new dwarf galaxies with median g-band magnitude, color, HI-flux, and mass.
Why it matters
This paper significantly expands our knowledge of the Local Volume by identifying new dwarf galaxies. These discoveries provide crucial data for understanding galaxy formation and evolution in nearby environments.
Original Abstract
We extracted a list of 662 nearby (within $\sim16$ Mpc) HI-detection sources from the Five-hundred-meter Aperture Spherical radio Telescope (FAST) All Sky HI Survey (FASHI) and made a visual identification of them with optical counterpart. This inspection led to the discovery of 71 new dwarf galaxies. All of them are dwarf irregular galaxies with ongoing star formation. They are characterized by the following median parameters: visual magnitude of $g=17.8$ mag and color $(g-r)=0.29$ mag, HI-flux $S_\mathrm{HI}=718$ mJy km/s, HI-mass $M_\mathrm{HI}=3.7\times10^7$ $M_\odot$, as well as the HI line-width of $W_{50}=37$ km/s.
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