(small galaxy with a few billion stars)
The term dwarf galaxy is used for galaxies much smaller
than the Milky Way, i.e.,
of a few billion stars at most, and as small as 100 parsecs
across. They can be any of the normal galaxy types
(dwarf elliptical, dwarf irregular, dwarf spiral)
or a dwarf spheroidal galaxy, more sphere-shaped,
like a typical globular cluster but more extensive
(and perhaps containing multiple globular clusters).
Often dwarf galaxies are satellite galaxies.
Additional specific terms:
- blue compact dwarf galaxy (BCD or blue compact galaxy or BCG) - with young hot stars.
- ultra-compact dwarf galaxy (UCD) - a width in the 100-parsec range.
- hobbit galaxy - small, faint dwarf galaxy.
(The term compact galaxy (CG) came into use meaning it has
a high surface brightness compared to its apparent diameter,
which can be the result of a very high density of stars.)
Example dwarf galaxies (in the Local Group):
Beyond the Local Group:
Referenced by pages:
David Dunlap Observatory Catalog (DDO)
dwarf galaxy classification
dwarf galaxy problem
dwarf spheroidal galaxy (dSph)
faint blue galaxy (FBG)
pea galaxy (GP)
hierarchical assembly of galaxies
I Zwicky 18 (I Zw 18)
Local Group (LG)
low-surface-brightness galaxy (LSB galaxy)
Magellanic clouds (MC)
rare designator prefixes
repulsive dark matter (RDM)
star formation (SF)
TiNy Titans (TNT)
Triangulum II (Tri II)
ultra-faint dwarf galaxy (UFD)
Virgo Stellar Stream