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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] |
| See also:Lists of nebulae | |
HVC 127-41-330 is ahigh-velocity cloud in the constellation ofPisces. 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 (700kiloparsecs) from Earth, betweenM31 andM33.[2] This cloud of neutral hydrogen (detectable via21 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 firstHVC discovered not associated with the Milky Way galaxy or subgroup (subcluster).
Astronomer Josh Simon considers it a candidate for being adark galaxy.[2] With its rotation, it may be a very low densitydwarf galaxy of unused hydrogen (no stars), a remnant of the formation of theLocal Group.
| Forms of dark matter |  | ||||||
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| Search experiments |
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| Potentialdark galaxies | |||||||
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