A5003208876- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Science and Education Research
- Education and Digital Technologies
- Evasion and Academic Success Factors
- Health, Education, and Aging
- Solar and Space Plasma Dynamics
- SAS software applications and methods
- Radioactive Decay and Measurement Techniques
- Astro and Planetary Science
- Business and Management Studies
- Education and Public Policy
- Advanced Measurement and Detection Methods
- History and Developments in Astronomy
- Aerospace Engineering and Energy Systems
- Spacecraft and Cryogenic Technologies
- Spacecraft Design and Technology
- Chemistry Education and Research
Universidade do Vale do Paraíba
2014-2024
Instituto Tecnológico de Aeronáutica
2016-2019
We examine the relation between oxygen abundances in narrow-line regions (NLRs) of active galactic nuclei (AGNs) estimated from optical emission lines through strong-line method (the theoretical calibration Storchi-Bergmann et al.(1998)), via direct Te-method, and central intersect host galaxies determined radial abundance gradients. found that Te-method underestimates by up to ~2 dex (with average value ~0.8 dex) compared derived method. This confirms existence so-called "temperature...
We present a semi-empirical calibration between the metallicity ($Z$) of Seyfert 2 Active Galactic Nuclei and $N2$=log([N II]$\lambda$6584/H$\alpha$) emission-line intensity ratio. This was derived through [O III]$\lambda$5007/[O II]$\lambda$3727 versus $N2$ diagram containing observational data photoionization model results obtained with Cloudy code. The sample consists 463 confirmed nuclei (redshift $z < 0.4$) taken from Sloan Digital Sky Survey DR7 dataset. $Z$-$N2$ relation is valid for...
We compare the oxygen abundance (O/H) of Narrow Line Regions (NLRs) Seyfert 2 AGNs obtained through strong-line methods and from direct measurements electron temperature (Te-method). The aim this study is to explore effects use distinct on range metallicity mass-metallicity relation at low redshifts (z < 0.4). used Sloan Digital Sky Survey (SDSS) NASA/IPAC Extragalactic Database (NED) selected optical (3000 A 7000) emission line intensities 463 confirmed AGNs. NLRs were estimated using...
For the first time, sulphur abundance relative to hydrogen (S/H) in Narrow Line Regions of a sample Seyfert 2 nuclei (Sy 2s) has been derived via direct estimation electron temperature. emission line intensities from SDSS DR17 [in wavelength range 3000 < $\lambda$ 9100] and literature for 45 nearby ($z$ 0.08) Sy 2s were considered. Our estimates indicate that have similar temperatures gas region where most S+ ions are located comparison with star-forming regions (SFs). However, present...
ABSTRACT For the first time, helium abundance relative to hydrogen (He/H), which relied on direct measurements of electron temperature, has been derived in narrow line regions (NLRs) from a local sample Seyfert 2 nuclei. In view this, optical emission intensities [3000 &lt; λ(Å) 7000] 65 nuclei (z 0.2), taken Sloan Digital Sky Survey Data Release 15 and additional compilation literature, were considered. We used photoionization model grid derive an Ionization Correction Factor (ICF) for...
GMOS-IFU observational data were used to study the detailed two dimensional gas kinematics and morphological structures within ~500x421 pc^2 of active Seyfert 2 galaxy NGC 4501. We provide empirical evidences possible outflowing material from central zones 4501 observer. In addition, we performed a spectral synthesis diagnostic diagram analysis determine respectively dominant stellar population in inner disc this unveil actual nature engine The principal finding work is that regions are...
Interactions between galaxies are very common. There special types of interactions that produce systems called polar ring (PRGs), composed a lenticular, elliptical or spiral host galaxy, surrounded by stars and gas, orbiting in an approximately plane. In this paper, we study AM 2020–504, PRG with narrow well-defined ring, probably formed accretion material from donor collected the galaxy. Our observational is based on BVRI broad-band imagery as well long-slit spectroscopy wavelength range...
This observational study is about the effects of interaction on kinematics and chemical abundance component galaxies AM 2229−735. system formed by a disc galaxy, NED01, compact perturbed Sb(s)-like NED02, latter showing tail counter-tail arc-shaped feature. could be progenitor polar ring galaxy. The sky-projected very luminous seems to connect galaxies. Our was based BVRI broad-band imagery as well long-slit spectroscopy in wavelength range 4240–8700 Å. We estimated heliocentric radial...
Aims. We investigate the nature of two galaxies that are located in field ring galaxy HRG 2302.
Mudanças na sociedade atual têm estimulado reflexões sobre qual seria o papel da universidade. Desse modo, no lugar “hiperespecialização” das disciplinas contexto universitário, tem-se a ideia interdisciplinaridade como uma maneira de educação ser entendida e trabalhada. Apesar nos cursos Engenharia se caracterizar um passo crucial para formação profissionais mais qualificados preparados mercado trabalho, as ações com esse enfoque ainda são poucas isoladas. Este artigo visa apresentar...
We present an observational study of the galaxy HRG 54103, a peculiar with asymmetric disc ring. The main goal this work is to stellar population and oxygen abundances for inner bulge region. kinematics derived from long-slit spectroscopy suggest that line nodes gaseous component 54103 nearly along ring minor axis. seems be kinematically decoupled relative morphology A small, but non-negligible, fraction young stars (5–10 per cent) estimated contribute. This object mainly dominated by old...
ABSTRACT This contribution aims to study the nature (kinematic, nuclear activity, and stellar population) of a sample 10 galaxies in poor cluster Abell S0805. As no detailed optical spectroscopy for some members has been published yet, selected makes this ideal investigating properties following objects: ESO 104- G(002, 006, 007, 008, 009, 010, 013), Fairall 0187, PGC (062384, 062391). Our main results were obtained after subtraction underlying population with spectral synthesis code...
<title>Abstract</title> This observational study investigates the effects of interaction on kinematics and chemical abundance peculiar galaxy ESO 287-IG50, which may be a polar ring in an ongoing formation process. The utilized BVRI broad band imagery longslit spectroscopy wavelength range 4240 − 8700 ̊A, empirical methods were used to investigate metallicity H II regions 287-IG50 its implications history. STARLIGHT stellar population synthesis code was analyze data,and standard diagnostic...
Há alguns anos a tecnologia vem remodelando natureza dos laboratórios, principalmente com o desenvolvimento Laboratórios Controlados Remotamente, chamados de WebLabs. WebLabs são ambientes que permitem interagir, controlar, monitorar e analisar os dados experimentos remotamente, através da Internet. São semelhantes às técnicas simulação, porém, permite ao aluno trabalhar reais, além otimizar espaço, tempo custo perante um laboratório tradicional. Com intuito melhorar aprendizagem física,...
O acúmulo de massa, proveniente do processo interação que forma as galáxias com anel polar, é um fator favorece condições necessárias para disparar atividades nucleares não térmicas. Esse fato fomentou a análise química dez polar. Com o objetivo verificar presença núcleoativo nessas galáxias, construímos diagramas diagnósticos usando linhas Hβ, [OIII], [OI], Hα, [NII] e[SII] e classificamos quanto ao tipo atividade nuclear. Para apresentam choque, determinamos, também, parâmetro N2 O3N2....
Kelvin-Helmholtz instabilities are common in astrophysical systems, ranging from jet black holes up to protoplanetary accretion disk. An object with strong characteristics of the instability is Caraguejo Nebula, which material expansion was caused by explosion a supernova about 1000 years ago. This occurs at boundary between two fluids different densities when one accelerated respect other. In order study this instability, we performed simulation code ATHENA Eulerian mesh. For simulation,...
As instabilidades Kelvin-Helmholtz são comuns em sistemas astrofísicos e vão desde jatos deburacos negros até disco de acreção protoplantário. Um objeto astrofísico com fortes características da instabilidade é a Nebulosa Caraguejo, na qual expansão do material foi ocasionado pela explosão uma supernova há, aproximadamente, 1000 anos. Essa ocorre no limite entre dois fluidos diferentes densidades, quando um dos acelerado relação ao outro. Com o objetivo estudar essa instabilidade, realizamos...
The accumulation of mass from the interaction process that forms polar ring galaxies is a factor favors conditions necessary to trigger nonthermal nuclear activities.. This fact encouraged chemical analysis ten galaxies. In order verify presence an active nucleus in these galaxias, we built diagnostic diagrams using lines H{\beta}, [OIII], [HI], H{\alpha}, [NII], and [SII] classified type activity. For do not show shock, parameters N2 O3N2 were also determined. From this sample, identified...
Polar ring galaxies (PRGs) are peculiar systems where a gas-rich, nearly polar surrounds host galaxy. They the result of galaxy interactions that form mainly by tidal accretion material from gas rich donor There is number formation mechanisms for PRGs: minor or major mergers, events, direct cold filaments cosmic web. These objects can be used to probe three-dimensional shape dark matter haloes, provided in equilibrium with gravitational potential The galaxy, AM 2040-620, which has not yet...
Resumo Estudos recentes na área do ensino de engenharia têm mostrado a importância se desenvolver novas abordagens nas aulas laboratório experimentais física séries iniciais dos cursos engenharia. Neste artigo apresentamos os resultados uma proposta desenvolvimento, baseada metodologia PBL, um experimento fácil construção e montagem, porém análise interpretação dados bastante complexos. O denominado, pêndulo laser, tem o objetivo analisar movimento ponto luz produzido por laser que está...