A possible formation scenario for dwarf spheroidal galaxies - III. Adding star formation histories to the fiducial model

TL;DR

This paper proposes a formation scenario for dwarf spheroidal galaxies where star clusters form within dark matter halos, dissolve over time, and create the faint luminous components observed, supported by simulations with varied star formation histories.

Contribution

It introduces a new model incorporating star formation histories into simulations to explain dwarf spheroidal galaxy formation, addressing previous modeling challenges.

Findings

Simulations match observed properties of dwarf spheroidal galaxies.

Star cluster dissolution contributes to faint luminous components.

Model successfully explains isolated dwarf spheroidal galaxy formation.

Abstract

Dwarf spheroidal galaxies are regarded as the basic building blocks in the formation of larger galaxies and are believed to be the most dark matter dominated systems known in the Universe. There are several models that attempt to explain their formation and evolution, but they have problems to model the formation of isolated dwarf spheroidal galaxies. Here, we will explain a possible formation scenario in which star clusters form inside the dark matter halo of a dwarf spheroidal galaxy. Those star clusters suffer from low star formation efficiency and dissolve while orbiting inside the dark matter halo. Thereby, they build the faint luminous components that we observe in dwarf spheroidal galaxies. In this paper we study this model by adding different star formation histories to the simulations to compare the results with our previous work and observational data to show that we can explain the formation of dwarf spheroidal galaxies.