Navegação Ciências Exatas e da Terra por Autor "Baldwin, Jack A."

Resultados 1-6 de 6

    • Anisotropic high-excitation emission and chemical abundances in the Seyfert 2 galaxy NGC 5643 

      Schmitt, Henrique Roberto; Storchi-Bergmann, Thaisa; Baldwin, Jack A. (1994) [Artigo de periódico]
      We present narrow-band images in the lines [O III] λ5007 and Hα(+ [N II] λλ6548, 6584 and long-slit spec­ troscopy along the bar of the Seyfert 2 galaxy NGC 5643. The continuum subtracted [O III] and Hα( images show that ...

    • Circumnuclear star formation in active galaxies 

      Storchi-Bergmann, Thaisa; Rodriguez-Ardila, Alberto; Schmitt, Henrique Roberto; Wilson, Andrew S.; Baldwin, Jack A. (1996) [Artigo de periódico]
      We study the gas kinematics and chemical abundances in the inner regions of six galaxies with active galactic nuclei. The galaxies were selected for having star-forming regions in rings or spirals within a few kiloparsecs ...

    • Double-peaked broad line emission from the LINER nucleus of NGC 1097 

      Storchi-Bergmann, Thaisa; Baldwin, Jack A.; Wilson, Andrew S. (1993) [Artigo de periódico]
      We report the recent appearance of a very broad component in the Hα and Hβ emission lines of the weakly active nucleus of the Sersic-Pastoriza galaxy NGC 1097. Subtraction of the contribution of the stellar population from ...

    • Nuclear rings in active galaxies 

      Storchi-Bergmann, Thaisa; Wilson, Andrew S.; Baldwin, Jack A. (1996) [Artigo de periódico]
      We investigate two current problems in active galactic nuclei-the mode of fueling the putative black hole, and the question of whether the circumnuclear regions have experienced unusual chemical processing-by studying the ...

    • Short timescale monitoring of the X-ray, UV, and broad double-pead emission line of the nucleus of 1097 

      Schimoia, Jáderson da Silva; Storchi-Bergmann, Thaisa; Grupe, Dirk; Eracleous, Michael; Peterson, Bradley M.; Baldwin, Jack A.; Nemmen, Rodrigo S.; Winge, Claudia (2015) [Artigo de periódico]
      Recent studies have suggested that the short-timescale (<~ 7 days) variability of the broad (∼10,000 km s-ˡ) doublepeaked Hα profile of the LINER nucleus of NGC 1097 could be driven by a variable X-ray emission from a ...

    • The ionization cone, obscured nucleus, and gaseous outflow in NGC 3281 : a prototypical Seyfert 2 galaxy? 

      Storchi-Bergmann, Thaisa; Wilson, Andrew S.; Baldwin, Jack A. (1992) [Artigo de periódico]
      We present narrow-band images and long-slit spectroscopy of the central region of the highly inclined Seyfert galaxy NGC 3281. The image of the continuum-subtracted [O III] λ4959 emission line shows a very clear conical ...