The Graduate Program in Physics at the Federal University of Santa Catarina (PPGFSC/UFSC) hereby announces Calls for Proposals No. 005/2026/ PPGFSC and No. 006/2026/PPGFSC, regarding the internal selection of projects for application to the FAPESC Master’s and Doctoral Scholarships (FAPESC Public Calls No. 043/2026 and No. 044/2026), for the 2026/2 semester.
Studying the Milky Way evolution with SPH + N-body models
The Milky Way experienced several merger events which left their imprints on the stellar halo. In particular, it is known that a major merger happened during the Galaxy’s first Gyrs and, likely, perturbed its disc-shape structure. To fully understand the effects of such an event, we need to know the chemical and dynamical characteristics of the young Milky Way, i.e., before the major merger event, and the accreted satellite. For this purpose, SPH + N-body models guide us to explore formation scenarios of Milky Way-like galaxies that went through similar merger events. Such idealized models enable us to control the initial conditions of the merger and which physical processes are included, therefore understanding them better. This talk is divided into three parts. First, I explore the evolution of isolated simulation galaxies with different star formation prescriptions and find evidence supporting a clumpy star formation phase in the young Galaxy. For instance, the kinematic and chemical properties of stars near the Sun, commonly associated with the effects of a merger, can be explained by a clumpy formation scenario. This scenario is supported by observations of high redshift (z>1) galaxies with highly dense clumpy regions. Secondly, I introduce the Gaia-EncelAdus-Sausage Timing, chemistRy and Orbit (GASTRO) library: a suite of simulations exploring the parameter space for GSE-like accretion events and its impact on the formation history of the MW. Finally, I use a subset of the GASTRO library and explore the chemodynamical properties of the accreted stars and the implications to the known substructures in the stellar halo of our Galaxy.
O PROGRAMA DE PÓS-GRADUAÇÃO EM FÍSICA convida para o seminário:
Um modelo semiempírico para espalhamento elétron-átomo em baixas energias
Prof. Dr. Felipe Arretche
Departamento de Física – UFSC
*Evento de presença obrigatória da disciplina seminários
Resumo: Colisões de elétrons com átomos e moléculas formam um ingrediente fundamental na modelagem de plasmas atmosféricos e astrofísicos. A descrição do processo de termalização destes ambientes exige que sejam conhecidas as seções de choque elétron-átomo na chamada região de “baixas energias” (E < 20 eV). Neste seminário vamos apresentar uma metodologia semiempírica para modelar estas colisões com foco nos dados experimentais mais precisos já apresentados até hoje na literatura. Faremos uma exposição didática da teoria de espalhamento por um potencial descrevendo as várias nuances na modelagem das interações elétron-átomo em vácuo. Por fim, discutiremos os problemas em aberto e as perspectivas para o futuro nesta linha de pesquisa.
Data: 24 de novembro de 2023 (sexta-feira) – Horário: 10h15min
Local: Sala 212 – Auditório do Departamento de Física
Agenda de Seminários: https://ppgfsc.posgrad.ufsc.br/seminarios/
