Formation scenarios of dSph galaxies

In this short review we show the different formation scenarios for dwarf spheroidal galaxies (dSphs) and focus on the two scenarios we are investigating at the Theory Group in Concepción. We have established the dissolving star cluster scenario, in which the dSph galaxies form in situ as they are now, using star forming events inside the central area of a dark matter (DM) halo, and furthermore, the dwarf galaxy in dissolution scenario in which we explain the structural and dynamical properties of dSph galaxies without the need of DM.