Tidal interactions at the edge of the Local Group: New evidence for
  tidal features in the Antlia Dwarf Galaxy
  Using deep B band imaging down to mu_{B} = 26 mag arcsec^{-2}, we present
evidence for tidal tails in the Antlia Dwarf galaxy, one of the most distant
members of the Local Group. This elongation is in the direction of Antlia's
nearest neighbor, the Magellanic-type NGC 3109. The tail is offset by less than
10 degrees from a vector linking the centers of the two galaxies, indicative of
interactions between the pair. Combined with the warped disc previously
identified in NGC 3109, Antlia and NGC 3109 must be at a small separation for
tidal features to be present in Antlia. We calculate that Antlia cannot be
completely disrupted by NGC 3109 in a single interaction unless its orbit
pericenter is less than 6 kpc, however multiple interactions could
significantly alter its morphology. Therefore despite being located right at
the edge of the Local Group, environmental effects are playing an important
role in Antlia's evolution.
