Navegação Ciências Exatas e da Terra por Autor "Krabbe, Angela Cristina"

Resultados 1-13 de 13

    • 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) [Artigo de periódico]
      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) [Artigo de periódico]
      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 : V. The discovery of shocked emission outside the AGN ionization axis 

      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 (2021) [Artigo de periódico]
      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 ...

    • 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) [Artigo de periódico]
      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 ...

    • Field galaxies at intermediate redshift (0.2 < z < 0.8) in the direction of the galaxy cluster LCDCS-S001 

      Krabbe, Angela Cristina; Rembold, Sandro Barboza; Pastoriza, Miriani Griselda (2007) [Artigo de periódico]
      We present a spectroscopic and photometric analysis for eight field galaxies in the direction of the galaxy cluster LCDCS-S001. The spectra were obtained with the GMOS instrument at the Gemini South Observatory. The objects ...

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

      Krabbe, Angela Cristina; Rosa, Deise Aparecida; Dors Júnior, Oli Luiz; Pastoriza, Miriani Griselda; Winge, Claudia; Hägelle, Guillermo Federico; Cardaci, Mónica V.; Rodrigues, Irapuan (2014) [Artigo de periódico]
      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 ...

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

      Krabbe, Angela Cristina; Rosa, Deise Aparecida; Pastoriza, Miriani Griselda; Hägelle, Guillermo Federico; Cardaci, Mónica V.; Dors Júnior, Oli Luiz; Winge, Claudia (2017) [Artigo de periódico]
      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 ...

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

      Rosa, Deise Aparecida; Dors Júnior, Oli Luiz; Krabbe, Angela Cristina; Hägelle, Guillermo Federico; Cardaci, Mónica V.; Pastoriza, Miriani Griselda; Rodrigues, Irapuan; Winge, Claudia (2014) [Artigo de periódico]
      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 ...

    • Kinematics and physical properties of southern interacting galaxies : the minor merger AM 2306–721 

      Krabbe, Angela Cristina; Pastoriza, Miriani Griselda; Winge, Claudia; Rodrigues, Irapuan; Ferreiro, Diego L. (2008) [Artigo de periódico]
      We present an observational study about the effects of the interactions in the kinematics, stellar population and abundances of the components of the galaxy pair AM2306-721. Rotation curves for the main and companion ...

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

      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 (2013) [Artigo de periódico]
      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. ...

    • Oxygen abundances in the narrow line regions of Seyfert galaxies and the metallicity–luminosity relation 

      Armah, Mark; Riffel, Rogério; Dors Júnior, Oli Luiz; Oh, Kyuseok; Koss, Michael; Ricci, Claudio; Trakhtenbrot, Benny; Valerdi, Mabel; Riffel, Rogemar André; Krabbe, Angela Cristina (2023) [Artigo de periódico]
      We present oxygen abundances relative to hydrogen (O/H) in the narrow line regions (NLRs) gas phases of Seyferts 1 (Sy 1s) and Seyferts 2 (Sy 2s) active galactic nuclei (AGNs). We used fluxes of the optical narrow emission ...

    • Photometry and dynamics of the minor mergers AM 1228-260 and AM 2058-381 

      Hernández Jiménez, José Andrés; Pastoriza, Miriani Griselda; Bonatto, Charles Jose; Rodrigues, Irapuan; Krabbe, Angela Cristina; Winge, Claudia (2015) [Artigo de periódico]
      We investigate interaction effects on the dynamics and morphology of the galaxy pairs AM 2058-381 and AM 1228-260. This work is based on r images and long-slit spectra obtained with the Gemini Multi-Object Spectrograph at ...

    • The effects of the interactions on the kinematics, stellar population and metallicity of AM2322−821 with Gemini/GMOS 

      Krabbe, Angela Cristina; Pastoriza, Miriani Griselda; Winge, Claudia; Rodrigues, Irapuan; Dors Júnior, Oli Luiz; Ferreiro, Diego L. (2011) [Artigo de periódico]
      We present an observational study of the impacts of the interactions on the kinematics, stellar populations and oxygen abundances of the components of the galaxy pair AM2322−821. A fairly symmetric rotation curve for the ...