Astrophysics (Index)About

dwarf galaxy

(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:

(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:

(galaxy type)
Further reading:

Referenced by pages:
dark matter
David Dunlap Observatory Catalog (DDO)
dwarf galaxy classification
dwarf galaxy problem
dwarf spheroidal galaxy (dSph)
faint blue galaxy (FBG)
galactic disk
galaxy classification
galaxy group
pea galaxy (GP)
Haro 29
hierarchical assembly of galaxies
I Zwicky 18 (I Zw 18)
Local Group (LG)
low-surface-brightness galaxy (LSB galaxy)
Andromeda (M31)
Magellanic clouds (MC)
Orphan stream
rare designator prefixes
repulsive dark matter (RDM)
satellite galaxy
SBS 0335-052
supermassive black hole (SMBH)
star formation (SF)
stellar stream
TiNy Titans (TNT)
Triangulum II (Tri II)
ultra-faint dwarf galaxy (UFD)
van den Bergh galaxy classification
Virgo Stellar Stream
Wolf-Lundmark-Melotte (WLM)