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Antlia Dwarf comprises two components: a core and an old halo.
There seems to have been a major episode of star formation in the Antlia Dwarf around 100 million years ago.
The Antlia Dwarf is a dwarf spheroidal/irregular galaxy.
The Antlia Dwarf and NGC 3109 may be actually physically bound if the distance between them is not very large.
The Antlia Cluster should not be confused with the Antlia Dwarf Galaxy.
The Antlia Dwarf, a 14.8 dwarf spheroidal galaxy that belongs to our Local Group of galaxies.
The Antlia Dwarf is believed to be tidally interacting with the small barred spiral galaxy, NGC 3109.
Sextans B may also be gravitationally associated with the galaxies NGC 3109 and the Antlia Dwarf.
Antlia Dwarf is unusual among dwarf spheroidal galaxies in that it contains large amounts (as much as 7 x10 solar masses) of neutral atomic hydrogen.
The warp has the same radial velocity as gas in the Antlia Dwarf galaxy, indicating that the two galaxies had a close encounter approximately one billion years ago.
Antlia Dwarf was first cataloged in 1985 by H. Corwin, Gérard de Vaucouleurs, and A. de Vaucouleurs.
The membership of NGC 3109, with its companions Sextans A and the Antlia Dwarf, is uncertain due to extreme distances from the center of the Local Group.
In 1999 Antlia Dwarf was identified by Sidney van den Bergh as the fourth member of the Antlia Group-the group of galaxies closest to the Local Group.
The Antlia Dwarf is classified alternatively as a dwarf elliptical galaxy of type dE3.5, or either as a dwarf spheroidal galaxy (dSph) or as a transitional galaxy from spheroidal to irregular types (dSph/Irr).
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