Bibcode
DOI
Aparicio, A.; Dalcanton, J. J.; Gallart, C.; Martinez-Delgado, D.
Referencia bibliográfica
The Astronomical Journal, v. 114, p. 1447.
Fecha de publicación:
10
1997
Número de citas
47
Número de citas referidas
41
Descripción
The Antlia dwarf galaxy, recently found to be a possible local Group
member, is analyzed using VI photometry. The galaxy is resolved into a
large number of stars and although the galaxy is intrinsically faint and
of low surface brightness, its stellar populations reveal
characteristics more typical of faint star-forming dIrs rather than dEs.
Significant star formation is currently going on in the central part of
Antlia although little or no star formation is taking place in the outer
regions. This indicates a two-component (core-halo) morphology which
appears to be common, not only in large spirals (disk-halo), but in
dwarf galaxies as well. The SFR averaged over the lifetime of the galaxy
is estimated to be Ψ‾ 1
Gyr/A˜3-9×1010 Msun yr-1
pc-2 while the more recent star formation, averaged over the
last 1 Gyr is much higher (Ψ1 Gyr/A˜3- 9×1010
Msun yr-1 pc-2 for the central region).
The total mass locked into stars and stellar remnants is estimated to be
M*˜2-4×106 Msun, estimated from the
TRGB is 1.32±0.06 Mpc, which places Antlia just beyond the Local
Group, and makes it a close companion of the dwarf galaxy NGC 3109
(Δr≥30 kpc), although it is not clear whether they are
gravitationally bound.