HVC 127-41-330
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| Interstellar cloud | |
|---|---|
| High-velocity cloud | |
| Observation data: J2000.0[1] epoch | |
| Right ascension | 01h 05m [1] |
| Declination | +21.8°[1] |
| Distance | 2,300,000 ly (700,000[2] pc) |
| Designations | HVC 127-41-331, HVC 128-41-329, HVC 127-42-352, HVC 127-41-330[1] |
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.[2] 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.[2] 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.
See also
References
- ^ a b c d "HVC 127-41-331". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 March 2018.
- ^ a b c Josh Simon (2005). "Dark Matter in Dwarf Galaxies: Observational Tests of the Cold Dark Matter Paradigm on Small Scales" (PDF). Archived from the original (PDF) on September 13, 2006.
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