Valeria Cristiani
What do the stellar disks and spheroids know about the galaxy that hosts them?
Galaxy formation is inherently linked to the diverse evolutionary paths of disk and spheroidal systems, which are the fundamental stellar components of galaxies. In order to get some light on the relation between these systems and the galaxy where they are located, we analyze some properties of the disk and spheroid populations, identified by dynamical decomposition from a sample of thousands of galaxies from the IllustrisTNG simulations, and taking into account the spheroidal mass fraction of the galaxy to which they belong. We find that disks with similar stellar mass and found in galaxies with smaller spheroid mass fraction: are smaller, have a lower Sérsic index, have formed more recently, and have lower ex-situ stellar mass, than those found in galaxies with greater spheroid mass fraction. This would indicate that a disk in a less massive galaxy has formed more recently mainly through in-situ star formation, whereas in a more massive galaxy the disk forms earlier and acquires a significant mass fraction from mergers. In contrast, for spheroids the same properties seem to be independent of the spheroid mass fraction of the galaxy to which they belong.
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What do the stellar disks and spheroids know about the galaxy that hosts them?