Mergers and Disc Galaxies: Results from the BEARD Survey and TNG50 Simulations

Marrero de la Rosa, Carlos; de Lorenzo-Cáceres, Adriana; Méndez-Abreu, Jairo
Referencia bibliográfica

Galactic Ecosystems Under the Microscope: lessons from highly-resolved studies

Fecha de publicación:
2
2026
Número de autores
3
Número de autores del IAC
3
Número de citas
0
Número de citas referidas
0
Descripción
The ΛCDM model predicts that mergers are expected to dominate the early evolution of galaxies. However, the high fraction of massive galaxies that are pure discs or that host very small bulges, including systems like the Milky Way (MW), challenges this paradigm. The BEARD (Bulgeless Evolution And the Rise of Discs) project is an international effort to provide multi-facility observational constraints to demonstrate the success or failure of the hierarchical ΛCDM scenario at forming MW analogs. In this talk, I will present our preliminary results from the analysis of deep photometry images of ~20 BEARD galaxies observed with the Wide Field Camera (WFC) on the Isaac Newton Telescope (INT). The data allows us to reach surface brightness depths ranging from 28 mag/arcsec2 to 31 mag/arcsec2. Such depth allows us to explore faint features that are crucial for understanding the merger history and mass assembly of these galaxies, while allowing for an adequate characterisation of their edges. The analysis employs advanced techniques, including the construction of the extended INT PSF, precise removal of scattered light from foreground stars, and robust 2D deconvolution of the images. By comparing the observational results with predictions from the Illustris TNG50 simulations, we are envisioning a scenario in which the amount and kind of mergers are crucial to create galaxies like our own, thus refining our knowledge on the hierarchical assembly of late-type galaxies.