intergalactic HI cloud
(cloud of HI not within any galaxy)
The term intergalactic HI cloud has been used for a volume of observed
neutral atomic hydrogen (HI) not associated with an observed galaxy. HI detected
beyond the Milky Way generally indicates the presence of a galaxy,
but galaxy formation is presumed to begin with star formation
in some region of space without a galaxy, starting with such an
extragalactic HI cloud.
Thus any discovery of such a cloud generates interest as do any other
signs of star formation at such a location. Such
clouds have been discovered, but in some cases, a galaxy has
subsequently been detected at the location, e.g., a
relatively-dim dwarf galaxy.
(cloud type,hydrogen,gas,object type)
Further reading:
http://ui.adsabs.harvard.edu/abs/2004IAUS..217...26B/abstract
https://ui.adsabs.harvard.edu/abs/2000AJ....120.1342K/abstract
Prefix | Example | | |
HI | HI 1225+01 | | |
|
Referenced by page:
cloud
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