Navegação Ciências Exatas e da Terra por Assunto "Galaxies : nuclei"

Resultados 21-29 de 29

    • Spectroscopy of the nuclear emission-line regions of the two newly detected Seyfert 1 galaxies F10.01 and A08.12 

      Rodriguez-Ardila, Alberto; Pastoriza, Miriani Griselda; Maza, Jose (1998) [Artigo de periódico]
      Long-slit medium-resolution spectra are used to study the continuum and ionization properties of the gas in the Seyfert 1 galaxies F10.01 and A08.12. We Ðnd that the nuclear underlying continuum can be described by a power ...

    • Steps toward determination of the size and structure of the broad-line region in active galactic nuclei. X. Variability of Fairall 9 from optical data 

      Santos-Lleo, M.; Chatzichristou, E.; Oliveira, Claudia Lucia Mendes de; Winge, Claudia; Alloin, Danielle Marie; Peterson, Bradley M.; Rodriguez-Pascual, P.M.; Stirpe, Giovanna M.; Beers, T.C.; Bragaglia, Angela; Claeskens, J.-F.; Federspiel, M.; Giannuzzo, E.; Gregorio-Hetem, J.; Mathys, G.; Salamanca, I.; Stein, P.; Stenholm, B.; Wilhelm, Ronald; Zanin, C.; Albrecht, P.; Calderon, J.H.; Caretta, C.A.; Carranza, Gustavo Jose; Costa, Roberto Dell'Aglio Dias da; Díaz, Rubén Joaquín; Dietrich, Matthias; Dottori, Horacio Alberto; Elizalde, Flavio; Goldes, G.; Ghosh, K.K.; Maia, M.A.G.; Paolantonio, S.; Rodrigues, Irapuan; Rodrigues-Ardila, Alberto; Schmitt, Henrique Roberto; Soundararajaperumal, S.; Souza, R.E. de; Willmer, C.N.A.; Zheng, W. (1997) [Artigo de periódico]
      The results of an optical monitoring campaign on the active nucleus in the luminous Seyfert 1 galaxy Fairall 9 are presented. This campaign was undertaken in parallel with ultraviolet spectroscopic monitoring with the IUE ...

    • Study of McLeish's interacting object 

      Díaz, Rubén Joaquín; Rodrigues, Irapuan; Dottori, Horacio Alberto; Carranza, Gustavo Jose (2000) [Artigo de periódico]
      We discuss the morphology, kinematics, and physical conditions of the emitting gas of the interacting system IRAS 20048—6621. We present as well numerical simulations of this interacting system, discovered by David McLeish ...

    • The difference between the narrow-line regions of Seyfert 1 and Seyfert 2 galaxies 

      Schmitt, Henrique Roberto (1998) [Artigo de periódico]
      This paper presents a comparative study of emission-line ratios of the narrow-line regions (NLRs) of Seyfert 1 and Seyfert 2 galaxies. It includes a literature compilation of the emission-line fluxes [O II] λ3727, [Ne III] ...

    • The extended narrow-line region of the Seyfert 1 galaxy ESO 362-G18 versus that of the Seyfert 2 galaxy ESO 362-G8 

      Fraquelli, Henrique Aita; Storchi-Bergmann, Thaisa; Binette, Luc (2000) [Artigo de periódico]
      We use long-slit spectroscopic data to study in detail the extended narrow-line regions (ENLRs) of the Seyfert 1 galaxy ESO 362-G18 and Seyfert 2 galaxy ESO 362-G8. These two galaxies have similar emission-line luminosities ...

    • The frequency of nuclear star formation in Seyfert 2 galaxies 

      Storchi-Bergmann, Thaisa; Raimann, Daniel Iunes; Bica, Eduardo Luiz Damiani; Fraquelli, Henrique Aita (2000) [Artigo de periódico]
      We investigate the detectability of starburst signatures in the nuclear spectrum of Seyfert 2 galaxies by constructing spectral models in the wavelength range λλ3500-4100, combining the spectrum of a bulge population (of ...

    • The narrow-line region of narrow-line Seyfert 1 galaxies 

      Rodriguez-Ardila, Alberto; Binette, Luc; Pastoriza, Miriani Griselda; Donzelli, Carlos J. (2000) [Artigo de periódico]
      This work studies the optical emission-line properties and physical conditions of the narrow-line region (NLR) of seven narrow-line Seyfert 1 galaxies (NLS1's) for which high signal-to-noise ratio spectroscopic observations ...

    • The nature of the optical light in Seyfert 2 galaxies with polarized continua 

      Storchi-Bergmann, Thaisa; Fernandes Junior, Roberto Cid; Schmitt, Henrique Roberto (1998) [Artigo de periódico]
      We investigate the nature of the optical continuum and stellar population in the central kiloparsec of the Seyfert 2 galaxies Mrk 348, Mrk 573, NGC 1358, and Mrk 1210 using high signal-to-noise−ratio, long-slit spectra ...

    • Visible and near-infrared spectroscopy of Seyfert 1 and narrow-line Seyfert 1 galaxies 

      Rodriguez-Ardila, Alberto; Pastoriza, Miriani Griselda; Donzelli, Carlos J. (2000) [Artigo de periódico]
      This paper studies the continuum and emission-line properties of a sample composed of 16 normal Seyfert 1 and seven narrow-line Seyfert 1 (NLS1) galaxies using optical and near-IR CCD spectroscopy. The continuum emission ...