Description
Dwarf galaxies are considered laboratories for studying the assembly of galaxies in the early universe, and their properties at final day may vary as a function of environment. In our work, we used the DM-only simulation COCO, along with the semi-analytic model GALFORM to investigate the differences in dwarf stellar mass assembly between different areas of the cosmic web. This allows us to investigate dwarf galaxies in a cosmological environment, which we would be unable to do with hydrodynamic simulations. Our findings show large trends in the stellar mass assemblies of dwarfs, with satellites in nodes assembling an average of 1.78 Gyrs earlier than satellites in walls, but only 0.23 Gyrs earlier for central galaxies. Satellite galaxies show strong dependence of mass assembly on environment, which is driven predominantly by the epoch at which an object becomes part of a larger host in different regions of the cosmic web. On the other hand, central galaxies do not show trends as significant as those of their host dark matter haloes due to the differences in the stellar to halo mass relation between different areas of the cosmic web. We also investigate the effect of varying parameters controlling the timing and filtering scale for reionisation, finding significant effects particularly in the regime of ultrafaints. This work is unique in providing a statistical investigation of the stellar mass assemblies of galaxies in this mass regime, and how those properties depend on the parameters of reionisation.
