Discovered a dwarf galaxy, consisting mainly of dark matter

A team of astronomers from the Chinese Academy of Sciences reports the discovery of a young dark dwarf galaxy.In

There are almost no stars, and dark matter predominates over traditional matter.The discovery is reported in a preprint of the study, which has been accepted for publication in The Astrophysical Journal Letters, but has not yet been peer-reviewed.

Astronomers have used FAST, or "Tianyang" -a spherical radio telescope with a 500-meter aperture located in southern China. As a result of analyzing FAST HI sky survey data, they discovered the previously unknown galaxy FAST J0139+4328, located about 94 million light-years from Earth.

Morphology of the dark galaxy FAST J0139+4328: map showing the density of neutral hydrogen from FAST observations. Image: Jin-Long Xu et al., arXiv.

A study of FAST J0139+4328 showed that thisa typical disk galaxy, but with an extremely low absolute magnitude and a stellar mass below 690,000 solar masses. Astronomers have found that the ratio of dynamical mass to total baryonic mass for FAST J0139+4328 is approximately 47 ± 27. This indicates that dark matter dominates baryons in this galaxy.

The researchers note that this is the first timewhen an isolated dark galaxy containing a large amount of gas is discovered in the nearest parts of the Universe. They believe that FAST J0139+4328 is only in its infancy. This confirms that the system has a rotating disk of gas, but almost no stars, and explains the dominance of dark matter.

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