Navegação Ciências Exatas e da Terra por Autor "González Delgado, Rosa M."

Resultados 1-10 de 10

    • An atlas of calcium triplet spectra of active galaxies 

      Garcia-Rissmann, Aurea; Neme, Luis Rodolfo Vega; Asari, Natalia Vale; Fernandes Junior, Roberto Cid; Schmitt, Henrique Roberto; González Delgado, Rosa M.; Storchi-Bergmann, Thaisa (2005) [Artigo de periódico]
      We present a spectroscopic atlas of active galactic nuclei covering the region around the λλ8498, 8542, 8662 calcium triplet (CaT). The sample comprises 78 objects, divided into 43 Seyfert 2s, 26 Seyfert 1s, three starburst ...

    • An atlas of the circumnuclear regions of 75 Seyfert galaxies in the near-ultraviolet with the Hubble Space Telescope advanced camara for surveys 

      Muñoz Marín, Victor M.; González Delgado, Rosa M.; Schmitt, Henrique Roberto; Fernandes, Roberto Cid; Pérez Jiménez, Enrique; Storchi-Bergmann, Thaisa; Heckman, Timothy M.; Leitherer, Claus (2007) [Artigo de periódico]
      We present an atlas of the central regions of 75 Seyfert galaxies imaged in the near-UV with the Advanced Camera for Surveys of the Hubble Space Telescope at an average resolution of ~10 pc. These data complement archival ...

    • Circumnuclear stellar population, morphology, and environment of Seyfert 2 galaxies : an evolutionary scenario 

      Storchi-Bergmann, Thaisa; González Delgado, Rosa M.; Schmitt, Henrique Roberto; Fernandes Junior, Roberto Cid; Heckman, Timothy M. (2001) [Artigo de periódico]
      We investigate the relation between the characteristics of the circumnuclear stellar population and both the galaxy morphology and the presence of close companions for a sample of 35 Seyfert 2 nuclei. Fifteen galaxies ...

    • Empirical diagnostics of the starburst-AGN connection 

      Fernandes Junior, Roberto Cid; Heckman, Timothy M.; Schmitt, Henrique Roberto; González Delgado, Rosa M.; Storchi-Bergmann, Thaisa (2001) [Artigo de periódico]
      We examine a representative sample of 35 Seyfert 2 nuclei. Previous work has shown that nearly half (15) of these nuclei show the direct (but difficult to detect) spectroscopic signature at optical/near-UV wavelengths of ...

    • On the nature of the near-UV extended light in Seyfert galaxies 

      Muñoz Marín, Victor M.; Storchi-Bergmann, Thaisa; González Delgado, Rosa M.; Schmitt, Henrique Roberto; Spinelli, Patrícia Figueiro; Pérez Jiménez, Enrique; Fernandes Junior, Roberto Cid (2009) [Artigo de periódico]
      We study the nature of the extended near-UV emission in the inner kiloparsec of a sample of 15 Seyfert (Sy) galaxies which have both near-UV (F330W) and narrow-band [O III] highresolution Hubble images. For the majority ...

    • Stellar population gradients in Seyfert 2 galaxies : northern sample 

      Raimann, Daniel Iunes; Storchi-Bergmann, Thaisa; González Delgado, Rosa M.; Fernandes Junior, Roberto Cid; Heckman, Timothy M.; Leitherer, Claus; Schmitt, Henrique Roberto (2003) [Artigo de periódico]
      We use high signal-to-noise ratio long-slit spectra in the λλ3600–4700 range of the 20 brightest northern Seyfert 2 galaxies to study the variation of the stellar population properties as a function of distance from the ...

    • The CaT strength in Seyfert nuclei revisited : analysing young stars and non-stellar light contributions to the spectra 

      Neme, Luis Rodolfo Vega; Asari, Natalia Vale; Fernandes Junior, Roberto Cid; Garcia-Rissmann, Aurea; Storchi-Bergmann, Thaisa; González Delgado, Rosa M.; Schmitt, Henrique Roberto (2009) [Artigo de periódico]
      In a former paper, we have presented spectra of 64 active, nine normal and five starburst galaxies in the region around the near-infrared calcium triplet (CaT) absorption lines and the [S III]λ9069 line. In the present ...

    • The stellar populations of low-luminosity active galactic nuclei. I. Ground-based observations 

      Fernandes, Roberto Cid; González Delgado, Rosa M.; Schmitt, Henrique Roberto; Storchi-Bergmann, Thaisa; Martins, Lucimara Pires; Pérez Jiménez, Enrique; Heckman, Timothy M.; Leitherer, Claus; Schaerer, Daniel (2004) [Artigo de periódico]
      We present a spectroscopic study of the stellar populations of low-luminosity active galactic nuclei (LLAGNs). Our main goal is to determine whether the stars that live in the innermost (100 pc scale) regions of these ...

    • The stellar populations of low-luminosity active galactic nuclei – III. Spatially resolved spectral properties 

      Fernandes Junior, Roberto Cid; González Delgado, Rosa M.; Storchi-Bergmann, Thaisa; Martins, Lucimara Pires; Schmitt, Henrique Roberto (2005) [Artigo de periódico]
      In a recently completed survey of the stellar population properties of low-ionization nuclear emission-line regions (LINERs) and LINER/H II transition objects (TOs), we have identified a numerous class of galactic nuclei ...

    • The stellar populations of low-luminosity active galactic nuclei. II. Space telescope imaging spectrograph observations 

      González Delgado, Rosa M.; Fernandes, Roberto Cid; Storchi-Bergmann, Thaisa; Martins, Lucimara Pires; Pérez Jiménez, Enrique; Heckman, Timothy M.; Leitherer, Claus; Schaerer, Daniel (2004) [Artigo de periódico]
      We present a study of the stellar populations of low-luminosity active galactic nuclei (LLAGNs). Our goal is to search for spectroscopic signatures of young and intermediate-age stars and to investigate their relationship ...