A scenario for achieving a low velocity dispersion for the galaxy [ KKS 2000 ] 04 ( aka NGC 1052-DF2 ) and similar galaxies is presented .
A progenitor halo corresponding to a z = 0 halo of mass \lower 2.15 pt \hbox { $ \buildrel < \over { \sim } $ } 5 \times 10 ^ { 10 } \textrm { M } _ { \odot } and a low concentration parameter ( but consistent with cosmological simulations ) infalls onto a Milky Way-size host at early times .
Substantial removal of cold gas from the inner regions by supernova feedback and ram pressure , assisted by tidal stripping of the dark matter in the outer regions , leads to a substantial reduction of the velocity dispersion of stars within one effective radius .
In this framework , the observed stellar content of [ KKS 2000 ] 04 is associated with a progenitor mass close to that inferred from the global stellar-to-halo-mass ratio .
As far as the implications of kinematics are concerned , even if at a \sim 20 Mpc distance , it is argued that [ KKS 2000 ] 04 is no more peculiar than numerous early type galaxies with seemingly little total dark-matter content .