A formation scenario for faint and ultra-faint dwarf spheroidal galaxies
Abstract
Faint and ultra-faint dwarf spheroidal galaxies represent a new population of dwarf spheroidal galaxies with very similar physical properties. They are the most dark matter dominated systems in the local Universe with absolute magnitudes between , a stellar mass range of and they are the most metal-poor ) dwarfs in the Local Group. They are extremely valuable for our understanding of structure formation in the Universe and useful probes of galaxy formation on smallest scales. We perform numerical simulations using our previous formation models of classical dwarf spheroidal galaxies to study a star formation scenario for faint and ultra-faint dwarf spheroidal galaxies with a strong background potential mimicking the dark matter halo. Our stars are initially in virial equilibrium and placed in a filamentary stellar distribution, a fractal distribution within an analytical halo, building the faint luminous components that we observe. We follow their evolution for .
- Publication:
-
Boletin de la Asociacion Argentina de Astronomia La Plata Argentina
- Pub Date:
- August 2019
- Bibcode:
- 2019BAAA...61..181A
- Keywords:
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- methods: numerical;
- galaxies: dwarf;
- galaxies: formation;
- galaxies: star formation;
- galaxies: kinematics and dynamics