Dark galaxy

From Wikipedia, the free encyclopedia

A dark galaxy is a galaxy-sized object containing very few or no stars (hence 'dark'). Held together by dark matter, it may also contain gas and dust. No dark galaxy with a black hole as a center have been discovered.

Contents 1 Candidates 1.1 HE0450-2958 1.2 HVC 127-41-330 1.3 VIRGOHI21 2 See also 3 References

[edit] Candidates

[edit] HE0450-2958

HE0450-2958 is an unusual quasar as no host galaxy has been detected around it. It has been suggested that this may be a dark galaxy in which a quasar has become active.

[edit] HVC 127-41-330

HVC 127-41-330 is a high velocity cloud between M31 and M33.

[edit] VIRGOHI21

The discovery of VIRGOHI21 was announced in February 2005. It was found by looking for the radio waves emitted by hydrogen.

[edit] See also

• Low surface brightness galaxy

[edit] References

• Britt, Roy. "First Invisible Galaxy Discovered in Cosmology Breakthrough", Space.com, 2005-02-23. 
• Battersby, Stephen. "Astronomers find first 'dark galaxy'", New Scientist, 2003-10-20. 
• Clark, Stuart. "Astronomers claim first 'dark galaxy' find", NewScientist.com news service, 2005-02-23. Retrieved on 2006-10-26. 
• Shiga, David (2005-02-26). "Ghostly Galaxy: Massive, dark cloud intrigues scientists" (^{[dead link]}). Science News Online 167 (9): 131.