Navegação Ciências Exatas e da Terra por Autor "Livio, Mario"

Resultados 1-4 de 4

    • Elliptical accretion disks in active galactc nuclei 

      Eracleous, Michael; Livio, Mario; Halpen, Jules P.; Storchi-Bergmann, Thaisa (1995) [Artigo de periódico]
      We present a calculation of the profiles of emission lines originating in a relativistic, eccentric disk, and show examples of the resulting model profiles. Our calculations are motivated by the fact that in about one­ ...

    • Evidence for a precessing accretion disk in the nucleus of NGC 1097 

      Storchi-Bergmann, Thaisa; Eracleous, Michael; Ruiz, Maria Teresa; Livio, Mario; Wilson, Andrew S.; Filippenko, Alexei V. (1997) [Artigo de periódico]
      We present new spectroscopic observations of the LINER (and now Seyfert 1) nucleus of NGC 1097, and discuss the evolution of its broad, double-peaked Balmer lines. When originally discovered in 1991, the red peak of the ...

    • Evidence of a starburst within 9 parsecs of the active nucleus of NGC 1097 

      Storchi-Bergmann, Thaisa; Nemmen, Rodrigo S.; Spinelli, Patrícia Figueiro; Eracleous, Michael; Wilson, Andrew S.; Filippenko, Alexei V.; Livio, Mario (2005) [Artigo de periódico]
      We report evidence of a recent burst of star formation located within 9 pc of the active nucleus of NGC 1097. The observational signatures of the starburst include UV absorption lines and continuum emission from young stars ...

    • The variability of the double-peaked balmer lines in the active nucleus of NGC 1097 

      Storchi-Bergmann, Thaisa; Livio, Mario; Wilson, Andrew S.; Filippenko, Alexei V.; Halpen, Jules P. (1995) [Artigo de periódico]
      We present spectroscopic observations of the nucleus of the Seyfert/low-ionization nuclear emission-line region galaxy NGC 1097 spanning the period 1991-1994. The goal was to monitor anticipated variations of the broad, ...