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Discovery of an isolated dark dwarf galaxy in the nearby universe

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arxiv 2302.02646 v1 pith:FPJ6ZBTV submitted 2023-02-06 astro-ph.CO

Jin-Long Xu , Ming Zhu , Naiping Yu , Chuan-Peng Zhang , Xiao-Lan Liu , Mei Ai , Peng Jiang This is my paper
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keywords galaxydarkfastisolatedmassj0139clouddisk
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Based on a new HI survey using the Five-hundred-meter Aperture Spherical radio Telescope (FAST), combined with the Pan-STARRS1 images, we identified an isolated HI cloud without any optical counterpart, named FAST J0139+4328. The newly discovered HI cloud appears to be a typical disk galaxy since it has a double-peak shape in the global HI profile and an S-like rotation structure in the velocity-position diagram. Moreover, this disk galaxy has an extremely low absolute magnitude (M_B>-10.0 mag) and stellar mass (<6.9*10^5 Msun). Furthermore, we obtained that the HI mass of this galaxy is 8.3*10^7 Msun, and the dynamical mass to total baryonic mass ratio is 47+-27, implying that dark matter dominates over baryons in FAST J0139+4328. These findings provide observational evidence that FAST J0139+4328 is an isolated dark dwarf galaxy with a redshift of z=0.0083. This is the first time that an isolated dark galaxy has been detected in the nearby universe.

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Cited by 3 Pith papers

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