Título: Constraints on the stellar IMF of early-type galaxies from optical and NIR spectral features

Pesquisador: Francesco La Barbera, INAF-Osservatorio Astronomico di Capodimonte, Naples (Italy)

Data/Horáro: 15/08/16, as 14:00h

Local: Observatório Astronômico da UESC

Resumo: Understanding the stellar initial mass function (IMF) is a key aspect to obtain a complete picture of galaxy formation and evolution. In the last years, we have carried out a systematic census of the IMF in the unresolved stellar populations of (massive) early-type galaxies (ETGs), using optical and NIR spectroscopy from different surveys (e.g. SDSS, CALIFA) and dedicated observing programmes (OSIRIS@GTC, XSHOOTER@VLT). I will show results on a non-universal IMF in ETGs - pointing to an excess of low-mass stars in high-, relative to low-, mass galaxies - and current constraints on the physical driver of observed variations in the stellar IMF.  


Título: Are Chemically rich protostellar jets an illusion ?

Pesquisador: Prof. Bertrand Lefloch (UGA/Grenoble, França)

Data/Horáro: 21/07/2016, às 11:00h

Local: Observatório Astronômico da UESC

Resumo: Protostellar outflows are one of the most spectacular manifestations of the mass-loss phenomena which take place along the protostellar evolution, from the early, embedded Class 0 to the late Class I phase. Many protostellar outflows show evidence for molecular jets. The origin of molecules in protostellar jets is one of the major enigma in star formation and, as such, the study of the molecular composition of jets could bring useful constraints on the gas dynamics in the jet, and possibly on the launching mechanism itself. In this context, chemically rich protostellar jets are extremely promising objects of study. 

After reviewing our present knowledge of chemically rich protostellar jets, I will present the results of the study of a protostellar jet, carried out by our team in the past years with the major ground-based telescopes (IRAM, JCMT) and airborne/space missions (Herschel, SOFIA). Exploring the jet molecular emission from 80 GHz to 2000 GHz, we have obtained an unprecedented view on the chemical and physical conditions in the jet. I will discuss the molecular content and the origin of the emission in the jet.








O Prof. Augusto Damineli (IAG/USP) dará um seminário no Observatório Astronômico da UESC na próxima quarta-feira, dia 03 de fevereiro, as 09:00h. Ele falará sobre Eta Carina, uma estrela bastante peculiar. Para os interessados, segue um link no qual o próprio Damineli explica mais sobre o assunto:



A Dra. Arianna Cortesi (pós-doc do IAG/USP) dará o seminário "MegaMorph multi-band photometry fitting routine" no dia 21 de janeiro (quinta-feira), as 10:00h, no Observatório Astronômico da UESC. O resumo pode ser conferido aqui abaixo.

Resumo: In this talk I will present the software MegaMorph (Haiesler et al. 2013). I will show how it works and the main results obtained using SDSS, Alhambra and GAMA data. Finally I will present possible synergies, on the basis of the new-coming survey SPLUS.




No dia 18/01/2016, próxima segunda-feira, às 14:00h, no auditório do CTR (Centro de Pesquisas em Ciências e Tecnologias das Radiações) , o Prof. Vilson Zanchin, UFABC, apresentará o seminário "Electrically charged systems in general relativity: from compact stars to quasiblack holes and regular black holes.",no projeto Seminários Acadêmicos de Física e Astronomia.



Em construção