摘要：We explore the baryonic Tully–Fisher relation in the Local Group. Rotationally-supported Local Group galaxies adhere precisely to the relation defined by more distant galaxies. For pressure-supported dwarf galaxies, we determine the scaling factor βc that relates their observed velocity dispersion to the equivalent circular velocity of rotationally-supported galaxies of the same mass such that Vo = βcσ*. For a typical mass-to-light ratio ϒ* = 2 M☉/L☉ in the V band, we find that βc = 2. More generally, . This provides a common kinematic scale relating pressure and rotationally-supported dwarf galaxies.
