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|High velocity cloud|
|Observation data: J2000.0 epoch|
|Right ascension||01h 05m|
|Distance||2,300,000 ly (700,000 pc)|
|Designations||HVC 127-41-331, HVC 128-41-329, HVC 127-42-352, HVC 127-41-330|
HVC 127-41-330 is a high-velocity cloud. The three numbers that compose its name indicate, respectively, the galactic longitude and latitude, and velocity towards Earth in km/s. It is 20,000 light years in diameter and is located 2.3 million light years (700 kiloparsecs) from Earth, between M31 and M33. This cloud of neutral hydrogen (detectable via 21 cm H-I emissions), unlike other HVCs shows a rotational component and dark matter. 80% of the mass of the cloud is dark matter. It is also the first HVC discovered not associated with the Milky Way galaxy or subgroup (subcluster).
Astronomer Josh Simon considers it a candidate for being a dark galaxy. With its rotation, it may be a very low density dwarf galaxy of unused hydrogen (no stars), a remnant of the formation of the Local Group.
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- Josh Simon (2005). Dark Matter in Dwarf Galaxies: Observational Tests of the Cold Dark Matter Paradigm on Small Scales. Archived from the original on September 13, 2006. https://web.archive.org/web/20060913084945/http://www.astro.caltech.edu/~jsimon/thesis/jdsthesis.pdf.
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