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ultra-faint dwarf galaxy

(UFD)
(recently discovered faint dwarf galaxies in the Local Group)

An ultra-faint dwarf galaxy is a faint Local-Group dwarf galaxy. To this point, all known are Milky-Way satellites. They have been discovered in recent surveys such as Sloan Digital Sky Survey. They are of interest because cosmology theory predicted more satellites of larger Milky-Way-like galaxies than had been observed in the past (the dwarf galaxy problem), and it has been suggested that the gap between observation and theory has closed somewhat.


(galaxy type,dwarf galaxies)
http://en.wikipedia.org/wiki/Dwarf_galaxy_problem
http://arxiv.org/abs/0706.0516

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