How diverse are the inner structures of MW mass-type galaxies?

SARA ORTEGA- MARTINEZ; PEDROSA, S.; R. DOMINGUEZ-TENREIRO; P. B. TISSERA; AURA OBREJA; ROSAS-GUEVARA, Y.

Leiden

Congreso; European Astronomical Society Annual Meeting 2021; 2021

SEA

An interesting question regarding the MW galaxy is how diverse, among the population of MW-typegalaxies, the morphological, dynamic and stellar population properties GAIA is revealing. In particular,GAIA DR3 is dramatically increasing the available information on the Inner Galactic Structures, includingtheir mutual relationships. This is an important advancement, from the observational side, regarding thequestion of the physical origin of these structures, to be complemented by numerical simulations. Largevolume hydrodynamical simulations in a cosmological context are an excellent tool for this kind ofstatistical study.Here we report on the analysis of a subsample of MW mass-type galaxies selected from the largest boxof the EAGLE simulation (L100N1504).The inner regions of such simulated galaxies have been dynamically decomposed and studied in termsof the predominant structures they present (bar, bulge, pseudobulge, inner discs, halo stars...). For eachsimulated galaxy, the morphology of these structures, as well as their kinematics, orbital characteristics,ages and chemical compositions of their stellar constituents have been determined. Then, the statisticsof these properties have been quantified, including the scaling relations they show. As a result, we haveobtained a picture of the diversity of the properties characterizing the inner structures of MW mass-typegalaxies.