Possible dark galaxy in constellation Coma Berenices
VIRGOHI 21
Observation data (J2000 epoch)
Constellation
Virgo
Right ascension
12h 17m 53.6s[1]
Declination
+14° 45′ 25″[1]
Redshift
1966 km/s[1]
Distance
50 Mly[2]
Apparent magnitude (V)
< 27
Notable features
No stars
VIRGOHI21 is an extended region of neutral hydrogen (HI) in the Virgo cluster discovered in 2005. Analysis of its internal motion indicates that it may contain a large amount of dark matter, as much as a small galaxy. Since VIRGOHI21 apparently contains no stars, this would make it one of the first detected dark galaxies. Skeptics of this interpretation argue that VIRGOHI21 is simply a tidal tail of the nearby galaxy NGC 4254.
^ abc"NASA/IPAC Extragalactic Database". Results for VIRGOHI 21. Retrieved 2006-11-19.
^Cite error: The named reference PPARC was invoked but never defined (see the help page).
VIRGOHI21 is an extended region of neutral hydrogen (HI) in the Virgo cluster discovered in 2005. Analysis of its internal motion indicates that it may...
bright light from the quasars. In 2005, astronomers discovered gas cloud VIRGOHI21 and attempted to determine what it was and why it exerted such a massive...
position angle of 68°. A bridge of neutral hydrogen gas links NGC 4254 with VIRGOHI21, an HI region and a possible dark galaxy. The gravity from the latter...
experiments Potential dark galaxies HE0450-2958 HVC 127-41-330 Smith's Cloud VIRGOHI21 Related Antimatter Dark energy Exotic matter Galaxy formation and evolution...
February 2005, astronomers using the Lovell Telescope discovered the galaxy VIRGOHI21 that appears to be made almost entirely of dark matter. A 1:200 scale...
least luminous galaxy known (discounting possible dark galaxies such as VIRGOHI21 in the Virgo cluster of galaxies), after the Boötes Dwarf (absolute magnitude...
experiments Potential dark galaxies HE0450-2958 HVC 127-41-330 Smith's Cloud VIRGOHI21 Related Antimatter Dark energy Exotic matter Galaxy formation and evolution...
2005). February 23 – Astronomers announce the discovery of a galaxy, VIRGOHI21, that consists almost entirely of dark matter. March 23 – Two independent...
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