The imprints of clumpy star formation in the stellar spatial distribution in galactic discs

Data: 
13/11/2019 - 14:00 - 15:00
Local: 
Auditório "Prof. Dr. Paulo Benevides Soares", Bloco G

The imprints of clumpy star formation in the stellar spatial distribution in galactic discs

 

Leandro Beraldo e Silva

University of Central Lancashire

 

The vertical density profile of the Milky Way shows evidence of two different characteristic scales, defining the so-called thin disc (typically composed of stars that are poor in alpha elements, metal-rich and young on average) and the thick disc (typically composed of alpha-enhanced, metal-poor and old stars). Closely related to these geometric discs is the presence of a bi-modality in the Galactic chemical space ([alpha/Fe] vs [Fe/H]), defining a high-alpha and a poor-alpha regions. This chemical bi-modality was recently shown to naturally emerge in hydrodynamical simulations that allow the formation of clumps in the early evolution. In this talk, I will present recent results showing that this clumpy star formation scenario also naturally produces geometric discs (particularly the thick disc) with properties very similar to those observed in the Milky Way.