Výsledky vyhledávání - "Dors Júnior, Oli Luiz"

Chemical abundances in Seyfert galaxies : IX. Helium abundance estimates

Autor: Dors Júnior, Oli Luiz, Valerdi, Mabel, Freitas-Lemes, Priscila, Krabbe, Angela Cristina, Riffel, Rogemar André, Amôres, Eduardo Brescansin de, Riffel, Rogério, Armah, Mark, Santos, Adriano Francisco Monteiro dos, Oliveira Junior, Celso Benedito de

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

For the first time, the helium abundance relative to hydrogen (He/H), which relied on direct measurements of the electron temperature, has been derived in the narrow line regions (NLRs) from a local sample of Seyfert 2 nuclei. In view of this, optica

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Gas-phase metallicity determinations in nearby AGNs with SDSS-IV MaNGA : evidence of metal-poor accretion

Autor: Nascimento, Janaina Correa do, Dors Júnior, Oli Luiz, Storchi-Bergmann, Thaisa, Mallmann, Nícolas Dullius, Riffel, Rogério, Ilha, Gabriele da Silva, Riffel, Rogemar André, Rembold, Sandro Barboza, Machado, Alice Deconto, Costa, Luiz N. da, Armah, Mark

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

We derive the metallicity (traced by the O/H abundance) of the narrow-line region (NLR) of 108 Seyfert galaxies as well as radial metallicity gradients along their galaxy discs and of these of a matched control sample of no active galaxies. In view o

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Chemical abundances in Seyfert galaxies : VII. Direct abundance determination of neon based on optical and infrared emission lines

Autor: Armah, Mark, Dors Júnior, Oli Luiz, Aydar, Catarina, Cardaci, Mónica V., Hägelle, Guillermo Federico, Feltre, Anna, Riffel, Rogério, Riffel, Rogemar André, Krabbe, Angela Cristina

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

For the first time, neon abundance has been derived in the narrow line region from a sample of Seyfert 2 nuclei. In view of this, we compiled from the literature fluxes of optical and infrared (IR) narrow emission lines for 35 Seyfert 2 nuclei in the

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Chemical abundances in Seyfert galaxies : V. The discovery of shocked emission outside the AGN ionization axis

Autor: Riffel, Rogemar André, Dors Júnior, Oli Luiz, Armah, Mark, Storchi-Bergmann, Thaisa, Feltre, Anna, Hägelle, Guillermo Federico, Cardaci, Mónica V., Dutra, Daniel Ruschel, Krabbe, Angela Cristina, Pérez-Montero, Enrique, Zakamska, Nadia L., Santos, Izabel Cristina Freitas dos

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

We present maps for the electron temperature in the inner kpc of three luminous Seyfert galaxies: Mrk 79, Mrk 348, and Mrk 607 obtained from Gemini Multi-Object Spectrograph-integral field unit observations at spatial resolutions of ∼110–280 pc.

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Circumnuclear star formation in Mrk 42 mapped with Gemini Near-infrared Integral Field Spectrograph

Autor: Hennig, Moiré Gonçalves, Riffel, Rogemar André, Dors Júnior, Oli Luiz, Riffel, Rogério, Storchi-Bergmann, Thaisa, Colina, Luis

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

We present Gemini Near-infrared Integral Field Spectrograph (NIFS) observations of the inner 1.5 × 1.5 kpc2 of the narrow-line Seyfert 1 galaxy Mrk 42 at a spatial resolution of 60 pc and spectral resolution of 40 kms−1. The emission-line flux and

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Interaction effects on galaxy pairs with Gemini/GMOS- III : stellar population synthesis

Autor: Krabbe, Angela Cristina, Rosa, Deise Aparecida, Pastoriza, Miriani Griselda, Hägelle, Guillermo Federico, Cardaci, Mónica V., Dors Júnior, Oli Luiz, Winge, Claudia

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

We present an observational study of the impacts of interactions on the stellar population in a sample of galaxy pairs. Long-slit spectra in the wavelength range 3440–7300 Å obtained with the Gemini Multi-Object Spectrograph (GMOS) at Gemini South

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Interaction effects on galaxy pairs with Gemini/GMOS – II oxygen abundance gradients

Autor: Rosa, Deise Aparecida, Dors Júnior, Oli Luiz, Krabbe, Angela Cristina, Hägelle, Guillermo Federico, Cardaci, Mónica V., Pastoriza, Miriani Griselda, Rodrigues, Irapuan, Winge, Claudia

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

In this paper, we derive oxygen abundance gradients from HII regions located in 11 galaxies in eight systems of close pairs. Long-slit spectra in the range 4400–7300 Å were obtained with the Gemini Multi-Object Spectrograph at Gemini South (GMOS-S

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Interaction effects on galaxy pairs with Gemini/GMOS- I : electron density

Autor: Krabbe, Angela Cristina, Rosa, Deise Aparecida, Dors Júnior, Oli Luiz, Pastoriza, Miriani Griselda, Winge, Claudia, Hägelle, Guillermo Federico, Cardaci, Mónica V., Rodrigues, Irapuan

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

We present an observational study about the impacts of the interactions on the electron density of HII regions located in seven systems of interacting galaxies. The data consist of long-slit spectra in the range 4400–7300 Å, obtained with the Gemi

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A correlation between the stellar and [Fe II] velocity dispersions in active galaxies

Autor: Riffel, Rogemar André, Storchi-Bergmann, Thaisa, Riffel, Rogério, Pastoriza, Miriani Griselda, Rodriguez-Ardila, Alberto, Dors Júnior, Oli Luiz, Fuchs, Jaciara Tamara, Diniz, Marlon Rodrigo, Schönell Júnior, Astor João, Hennig, Moiré Gonçalves, Brum, Carine

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

We use near-infrared (near-IR) spectroscopic data from the inner few hundred parsecs of a sample of 47 active galaxies to investigate possible correlations between the stellar velocity dispersion (σ ), obtained from the fit of the K-band CO stellar

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Optical and mid-infrared neon abundance determinations in star-forming regions

Autor: Dors Júnior, Oli Luiz, Hägelle, Guillermo Federico, Cardaci, Mónica V., Pérez-Montero, Enrique, Krabbe, Angela Cristina, Vilchez, Jose M., Sales, Dinalva Aires de, Riffel, Rogério, Riffel, Rogemar André

Publikováno v: Repositório Institucional da UFRGS
Universidade Federal do Rio Grande do Sul (UFRGS)
instacron:UFRGS

We have used observational spectroscopic data of star-forming regions compiled from the literature and photoionization models to analyse the neon ionic abundances obtained using both optical and mid-infrared emission lines. Comparing Ne++/H+ ionic ab

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