Browsing by Author "Riffel, Rogério"

Now showing items 1-20 of 166

    • Active galactic nuclei signatures in Red Geyser galaxies from Gemini GMOS-IFU observations 

      Ilha, Gabriele da Silva; Riffel, Rogemar André; Ricci, Tiago Vecchi; Rembold, Sandro Barboza; Storchi-Bergmann, Thaisa; Riffel, Rogério; Roy, Namrata; Bundy, Kevin; Nemmen, Rodrigo S.; Schimoia, Jáderson da Silva; Costa, Luiz N. da (2022) [Journal article]
      Red Geysers are quiescent galaxies with galactic scale ionized outflows, likely due to low-luminosity active galactic nuclei (AGN). We used Gemini GMOS-IFU observations of the inner~1–3 kpc of nine Red Geysers selected ...

    • Active galactic nuclei winds as the origin of the H2 emission excess in nearby galaxies 

      Riffel, Rogemar André; Zakamska, Nadia L.; Riffel, Rogério (2020) [Journal article]
      In most galaxies, the fluxes of rotational H2 lines strongly correlate with star formation diagnostics [such as polycyclic aromatic hydrocarbons (PAHs)], suggesting that H2 emission from warm molecular gas is a minor ...

    • AGN feedback and star formation in the peculiar galaxy NGC 232 : insights from VLT-MUSE observations 

      Souza, José Henrique Costa Pinto; Riffel, Rogemar André; Dors Júnior, Oli Luiz; Riffel, Rogério; Poppe, Paulo César da Rocha (2024) [Journal article]
      We use VLT-MUSE integral field unit data to study the ionized gas physical properties and kinematics as well as the stellar populations of the Seyfert 2 galaxy NGC 232 as an opportunity to understand the role of AGN feedback ...

    • O ambiente circum-nuclear em galáxias ativas : formação estelar, toro de poeira e cinemática do gás 

      Dutra, Daniel Ruschel (2015) [Thesis]
      O paradigma atual para as galáxias de núcleo ativo sustenta que a emissão nuclear provém da acresçam de matéria a um buraco negro super massivo (SMBH), envolto em uma distribuição toroidal de nuvens de alta profundidade ...

    • Análise do espectro de AGNs no infravermelho próximo 

      Silva, Guilherme Henrique Trindade da (2019) [Abstract published in event]

    • An outflow perpendicular to the radio jet in the Seyfert nucleus of NGC 5929 

      Riffel, Rogemar André; Storchi-Bergmann, Thaisa; Riffel, Rogério (2013) [Journal article]
      We report the observation of an outflow perpendicular to the radio jet in near-infrared integral field spectra of the inner 250 pc of the Seyfert 2 galaxy NGC 5929. The observations were obtained with the Gemini Near-infrared ...

    • “Asteroídes e cometas – o que são e possibilidades de impactos com a Terra” 

      Teixeira, Eduardo; Riffel, Rogério; Dal Bosco, Jacqueline; Sperotto, Luiz; Teixeira, Eduardo; Teixeira, Eduardo; Aragão, Thaís; Frozza, Anelise; Teixeira, Eduardo; Dal Bosco, Jacqueline; Favaretto, Fernando (2014-10-30) [Video]
      O professor do Instituto de Física da UFRGS Rogério Riffel explica a diferença entre asteroides e cometas. Ele ainda faz estimativas sobre um possível impacto destes objetos astronômicos com a Terra.

    • BASS. XXII : the BASS DR2 AGN catalog and data 

      Koss, Michael; Riffel, Rogério; Williams, Jonathan (2022) [Journal article]
      We present the active galactic nucleus (AGN) catalog and optical spectroscopy for the second data release of the Swift BAT AGN Spectroscopic Survey (BASS DR2). With this DR2 release we provide 1449 optical spectra, of which ...

    • BASS. XXIV : the BASS DR2 spectroscopic line measurements and AGN demographics 

      Oh, Kyuseok; Koss, Michael; Ueda, Yoshihiro; Stern, Daniel; Ricci, Claudio; Trakhtenbrot, Benny; Powell, Meredith; Brok, Jakob den; Lamperti, Isabella; Mushotzky, Richard; Ricci, Federica; Bär, Rudolf; Rojas, Alejandra; Ichikawa, Kohei; Riffel, Rogério; Treister, Ezequiel; Harrison, Fiona Anne; Urry, C. Megan; Bauer, Franz Erik; Schawinski, Kevin (2022) [Journal article]
      We present the second catalog and data release of optical spectral line measurements and active galactic nucleus (AGN) demographics of the BAT AGN Spectroscopic Survey, which focuses on the Swift-BAT hard X-ray detected ...

    • BASS. XXIX : the near-infrared view of the broad-line region (BLR) : the effects of obscuration in BLR characterization 

      Ricci, Federica; Riffel, Rogério; Veilleux, Sylvain (2022) [Journal article]
      Virial black hole (BH) mass (MBH) determination directly involves knowing the broad-line region (BLR) clouds' velocity distribution, their distance from the central supermassive BH (RBLR), and the virial factor (f). ...

    • BASS. XXVIII : Near-infrared Data Release 2 : high-ionization and broad lines in active galactic nuclei 

      Brok, Jakob den; Riffel, Rogério; Veilleux, Sylvain (2022) [Journal article]
      We present the BAT AGN Spectroscopic Survey (BASS) Near-infrared Data Release 2 (DR2), a study of 168 nearby (z¯= 0.04, z < 0.6) active galactic nuclei (AGN) from the all-sky Swift Burst Array Telescope X-ray survey observed ...

    • BASS XXXI : outflow scaling relations in low redshift X-ray AGN host galaxies with MUSE 

      Kakkad, Darshan; Mallmann, Nícolas Dullius; Riffel, Rogério; Urry, C. Megan (2022) [Journal article]
      Ionized gas kinematics provide crucial evidence of the impact that active galactic nuclei (AGNs) have in regulating star formation in their host galaxies. Although the presence of outflows in AGN host galaxies has been ...

    • BASS. XXXV.: The MBH–σ* Relation of 105Month Swift-BAT Type 1 AGNs 

      Caglar, Turgay; Riffel, Rogério; Urry, C. Megan (2023) [Journal article]
      We present two independent measurements of stellar velocity dispersions (σå) from the Ca II H+K λ3969, 3934 and Mg I b λ 5183, 5172, 5167 region (3880–5550 Å) and the calcium triplet region (8350–8750 Å) for 173 hard ...

    • BAT AGN Spectroscopic Survey -IV. : near-infrared coronal lines, hidden broad lines and correlation with hard X-ray emission 

      Lamperti, Isabella; Koss, Michael; Trakhtenbrot, Benny; Schawinski, Kevin; Ricci, Claudio; Oh, Kyuseok; Landt, Hermine; Riffel, Rogério; Rodriguez-Ardila, Alberto; Gehrels, Neil C.; Harrison, Fiona Anne; Masetti, Nicola; Mushotzky, Richard; Treister, Ezequiel; Ueda, Yoshihiro; Veilleux, Sylvain (2017) [Journal article]
      We provide a comprehensive census of the near-infrared (NIR, 0.8–2.4 μm) spectroscopic properties of 102 nearby (z < 0.075) active galactic nuclei (AGN), selected in the hard X-ray band (14–195 keV) from the Swift-Burst ...

    • Busca de Galáxias Ativas nos espectros do BOSS 

      Garcia, Gabriel Zafalon (2014) [Abstract published in event]

    • Chemical abundances in Seyfert galaxies : IX. Helium abundance estimates 

      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 (2022) [Journal article]
      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 ...

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

      Armah, Mark; Dors Júnior, Oli Luiz; Aydar, Catarina; Cardaci, Mónica V.; Hägelle, Guillermo Federico; Feltre, Anna; Riffel, Rogério; Riffel, Rogemar André; Krabbe, Angela Cristina (2021) [Journal article]
      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 ...

    • Chemical abundances in Seyfert galaxies : X. sulphur abundance estimates 

      Dors Júnior, Oli Luiz; Valerdi, Mabel; Riffel, Rogemar André; Riffel, Rogério; Cardaci, Mónica V.; Hägelle, Guillermo Federico; Armah, Mark; Revalski, Mitchell; Flury, Sophia; Freitas-Lemes, Priscila; Amôres, Eduardo Brescansin de; Krabbe, Angela Cristina; Binette, Luc; Feltre, Anna; Storchi-Bergmann, Thaisa (2023) [Journal article]
      For the first time, the sulphur abundance relative to hydrogen (S/H) in the narrow-line regions of a sample of Seyfert 2 nuclei (Sy 2s) has been derived via direct estimation of the electron temperature. Narrow emission-line ...

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

      Hennig, Moiré Gonçalves; Riffel, Rogemar André; Dors Júnior, Oli Luiz; Riffel, Rogério; Storchi-Bergmann, Thaisa; Colina, Luis (2018) [Journal article]
      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. ...

    • A close look at the dwarf AGN of NGC 4395 : optical and near-IR integral field spectroscopy 

      Brum, Carine; Diniz, Marlon Rodrigo; Riffel, Rogemar André; Rodriguez-Ardila, Alberto; Ho, Luis C.; Riffel, Rogério; Mason, Rachel E.; Martins, Lucimara Pires; Petric, Andreea O.; Sanchez-Janssen, Rubén (2019) [Journal article]
      Intermediate-mass black holes (103–105 M⊙) in the centre of dwarf galaxies are believed to be analogous to growing active galactic nuclei (AGNs) in the early Universe. Their characterization can provide insight about the ...