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abril de 2019

Short Talks da Pós-Graduação (Astrofísica extragaláctica)

10 de abril: 12:30 - 13:30
Anfiteatro Antonio Cabral,

Palestrante: Janaina Correa do Nascimento Titulo: TBC Resumo: TBC Palestrante: Luis Gabriel Dahmer Hahn Título: A panchromatic spatially resolved study of the inner 500pc of NGC1052 - II: Gas excitation and kinematics Resumo: We map the optical and near-infrared properties of the emission lines of the inner 320x535pc² of the elliptical galaxy NGC 1052. The optical and NIR spectra were obtained using the Integral Field Units of GMOS and NIFS, respectively. We detect four kinematical components. A broad line visible in Ha, with a FWHM of…

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Probing Jet Outflows in AGNs using Radio Interferometry Techniques – Juliana Motter (IF-UFRGS)

17 de abril: 12:30 - 13:30
Anfiteatro Antonio Cabral,

The nature of the relativistic jets ejected from AGN remains among fundamental problems in Astrophysics. Theoretical models of jet formation invoke the presence of magnetic fields associated with the central compact object of the AGN, and the jets must originate through some process that would involve the extraction of energy from the black hole spin or from the accretion disk. The coupling of the material in the rotating disk with the field lines could give rise to a helical field…

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Indiana Jones and where to find relic galaxies – Fernando Buitrago (IA, Portugal)

24 de abril: 12:30 - 13:30
Anfiteatro Antonio Cabral,

There are massive galaxies that remain untouched since the high-z Universe. These objects, the so-called relic galaxies, are massive (M_stellar > 8x10^10 M_Sun), very small (effective radius < 2 kpc) and display old (>10 Gyr) stellar populations (thus being red nuggets but at low-z!). For the very few of them already found and analysed, they seem to host übermassive black holes, to show a bottom-heavy IMF and to retain early disk morphologies and kinematics. How did they survive until the…

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maio de 2019

The First imaging of a black hole – Horácio e Juliana

8 de maio: 12:30 - 13:30
Anfiteatro Antonio Cabral,

I) Imaging a Black Hole - challenges of the EHT experiment: Nearly one month ago, the Event Horizon Telescope Collaboration (EHT) presented the first image of the shadow of a black hole to the world. In order to obtain the required angular resolution to accomplish this, the EHT team designed an ambitious experiment that combined radio telescopes spread all over the globe to build an Earth-sized virtual mirror using a technique called radio interferometry. This technique has been vastly used…

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Cosmology with the Year-3 data of the Dark Energy Survey – Lucas Secco (University of Pennsylvania)

22 de maio: 12:30 - 13:30
Anfiteatro Antonio Cabral,

 The Year-1 analysis of the Dark Energy Survey (DES) data yielded state-of-the-art cosmological constraints. In particular, the weak lensing constraints on the amplitude of matter clustering reached, for the first time, an accuracy comparable to that of CMB experiments. In the upcoming Year-3 release, the substantial increase of statistical power is demanding changes in our theory methods and treatment of systematics.  I will present the current status of the DES-Y3 weak lensing cosmology analysis and the challenges that come with it,…

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Evolutionary Sequences of Massive White Dwarfs – Gabriel Lauffer Ramos (UFRGS)

29 de maio: 12:30 - 13:30
Anfiteatro Antonio Cabral,

White dwarf stars are the most common final stage of stellar evolution. In fact, they are the end product of main sequence stars with masses up to 8.5-10.6 Msun, which correspond to 99% of all stars in the galaxy. They can be divided in two main classes: DAs and non-DAs, based on the presence or absence of hydrogen layer on the atmosphere, respectively. The presence of hydrogen layer and the thickness of both H or He layer impacts the final…

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junho de 2019

Early Star Forming Galaxies and Reionization – Daniel P. Stark (University of Arizona)

5 de junho: 12:30 - 13:30
Anfiteatro Antonio Cabral,

Over the past decade, deep infrared images have pushed the cosmic frontier back to just 500 million years after the Big Bang, delivering the first large sample of galaxies at redshifts 7<z<10.  Sometime in this redshift window the hydrogen in the intergalactic medium transitioned from mostly neutral to ionized.  The emergence of the first detailed spectra of z>7 galaxies have begun to sharpen our understanding of this reionization process while also providing a glimpse of the physical nature of early…

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Aprendizagem de Máquina: Aplicações e Estado-da-Arte – Bruno Castro da Silva (UFRGS)

12 de junho: 12:30 - 14:00
Anfiteatro Antonio Cabral,

Nesta palestra, iremos apresentar as três grandes famílias de técnicas de aprendizagem de máquina, descrevendo os seus objetivos e apresentando aplicações atuais e do estado-da-arte. Iremos discutir técnicas representativas de algoritmos de aprendizado supervisionado, não-supervisionado, e de aprendizado por reforço. A palestra não será técnica e tem como objetivo expor de forma intuitiva o potencial de utilização dos diferentes métodos computacionais de aprendizagem de máquina no contexto de análise de dados, problemas de otimização, descoberta de padrões, e tomada de…

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Human in the loop: adaptive learning in astronomy – Emille E. O. Ishida (Université Clermont Auvergne)

19 de junho: 12:30 - 13:30
Anfiteatro Antonio Cabral,

The full exploitation of the next generation of large scale photometric supernova surveys depends heavily on our ability to provide a reliable early-epoch classification based solely on photometric data. In preparation for this scenario, there has been many attempts to apply different machine learning algorithms to the supernova photometric classification problem. Although different methods present different degree of success, text-book machine learning methods fail to address the crucial issue of lack of representativeness between spectroscopic (training) and photometric (target) samples.…

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Highlights of the IAU Symposium 352: Uncovering early galaxy evolution in the ALMA and JWST era – Allan Schnorr Müller

26 de junho: 12:30 - 13:30
Anfiteatro Antonio Cabral,

The IAU Symposium 352 was held from the 3rd of June to the 7th in Viana do Castelo, Portugal. I will talk about the highlights of this event, covering the following topics: 1) galaxies at the epoch of reionization; 2) massive galaxy assembly and the effects of AGN and environment; 3) the interstellar medium of high-redshift galaxies; 4) spatially-resolved analysis of z > 2 galaxies; 5) lessons from local galaxies and high-z analogues.

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