The Evolution of Dwarf Galaxies with Star Formation in an Outward-propagating Supershell
Approach
N-body/SPH and stellar-population synthesis follow a dark-halo-confined system after a central starburst drives a supersonic gas outflow.
Main result
Stars form successively in an expanding shell. The final stellar system has an exponential light profile and outward-increasing metallicity, matching features of some observed dwarfs.
Scientific implications
The scenario connects stellar feedback with the formation of relatively diffuse small galaxies.
Scope and limitations
The calculation uses an idealized initial sphere and adopted feedback and star-formation prescriptions. It illustrates a formation mechanism rather than a unique history for every dwarf.