Using the eROSITA all-sky surveys, we will study the X-ray source populations in dwarf galaxies in the Local Group and nearby normal (without emission from active galactic nuclei) galaxies, which are dominated by accreting compact objects. It will for the first time allow us to understand the populations of X-ray sources at the lowest luminosities in satellite galaxies of the Milky Way all the way to the brightest sources in further distant galaxies. This project was newly introduced for the second eRO-STEP funding period (2024-2027), and will benefit from the results on the properties and populations of accreting compact objects in P3 and P5.
Dwarf spheroidal galaxies observed in X-rays, organized in the mass-distance plane. Credit: McConnachie (2012), Torrealba et al. (2019) 
HI Image of the Canis Major dwarf spheroidal, overlaid with accreting white dwarf systems identifed in the eROSITA all-sky survey.
Credit: Saeedi et al. (2024), in prep.
