Navegação por Autor "Nemmen, Rodrigo S."

Resultados 1-18 de 18

    • Acreção a buracos negros supermassivos no universo presente 

      Nemmen, Rodrigo S. (2009) [Tese]
      Há evidências contundentes de que u ma parcela significativa das galáxias no universo presente hospedam buracos negros supermassivos que acretam gás a baixas taxas. Tal acreção origina os núcleos ativos de baixa luminosidade ...

    • Active galactic nuclei signatures in Red Geyser galaxies from Gemini GMOS-IFU observations 

      Ilha, Gabriele da Silva; Riffel, Rogemar André; Ricci, Tiago Vecchi; Rembold, Sandro Barboza; Storchi-Bergmann, Thaisa; Riffel, Rogério; Roy, Namrata; Bundy, Kevin; Nemmen, Rodrigo S.; Schimoia, Jáderson da Silva; Costa, Luiz N. da (2022) [Artigo de periódico]
      Red Geysers are quiescent galaxies with galactic scale ionized outflows, likely due to low-luminosity active galactic nuclei (AGN). We used Gemini GMOS-IFU observations of the inner~1–3 kpc of nine Red Geysers selected ...

    • Cenário evolutivo para o disco de acresção em torno do buraco negro central em NGC 1097 

      Nemmen, Rodrigo S.; Storchi-Bergmann, Thaisa (2001) [Resumo publicado em evento]

    • A correlation between the highest energy cosmic rays and nearby active galactic nuclei detected by Fermi 

      Nemmen, Rodrigo S.; Bonatto, Charles Jose; Storchi-Bergmann, Thaisa (2010) [Artigo de periódico]
      We analyze the correlation of the positions of γ -ray sources in the Fermi Large Area Telescope (LAT) First Source Catalog (1FGL) and the First LAT Active Galactic Nuclei (AGNs) Catalog (1LAC) with the arrival directions ...

    • Double-peaked profiles : ubiquitous signatures of disks in the broad emission lines of active galactic nuclei 

      Storchi-Bergmann, Thaisa; Schimoia, Jáderson da Silva; Peterson, Bradley M.; Elvis, Martin; Denney, Kelly D.; Eracleous, Michael; Nemmen, Rodrigo S. (2017) [Artigo de periódico]
      Broad (10,000 km s−1), double-peaked emission-line profiles of Balmer lines emitted by active galactic nuclei (AGN) are thought to originate in the outer parts of an accretion disk surrounding a nuclear supermassive black ...

    • Escoamento acretivo como origem da emissão nuclear na galáxia NGC 1097 

      Nemmen, Rodrigo S. (2005) [Dissertação]
      NGC1097 é uma galáxia espiral a uma distância de 14.5 Mpc, com um núcleo LINER (do inglês Low-Ionization Nuclear Emission Region) de baixa luminosidade, a partir do qual foi descoberta em 1991 emissão larga de duplo pico ...

    • 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 ...

    • Evolução do disco de acreção em torno do buraco negro central em NGC 1097 

      Nemmen, Rodrigo S.; Storchi-Bergmann, Thaisa (2002) [Resumo publicado em evento]

    • Evolution of the accretion disc around the supermassive black hole of NGC 7213 

      Schimoia, Jáderson da Silva; Storchi-Bergmann, Thaisa; Winge, Claudia; Nemmen, Rodrigo S.; Eracleous, Michael (2017) [Artigo de periódico]
      We present observations of the double-peaked broad Hα profile emitted by the active nucleus of NGC7213 using the Gemini South Telescope in 13 epochs between 2011 September 27 and 2013 July 23. This is the first time that ...

    • Evolution of the nuclear accretion disk emission in NGC 1097 : getting closer to the black hole 

      Storchi-Bergmann, Thaisa; Nemmen, Rodrigo S.; Eracleous, Michael; Halpern, Jules P.; Wilson, Andrew S.; Filippenko, Alexei V.; Ruiz, Maria Teresa; Smith, Robert Christopher; Nagar, Neil M. (2003) [Artigo de periódico]
      We study the evolution of the broad, double-peaked H emission-line profile of the LINER/Seyfert 1 nucleus of NGC 1097, using 24 spectra obtained over a time span of 11 years—from 1991 November through 2002 October. While ...

    • Modelo para o disco de acresção no núcleo de NGC 1097 

      Nemmen, Rodrigo S.; Storchi-Bergmann, Thaisa (2000) [Resumo publicado em evento]

    • Models for jet power in elliptical galaxies : a case for rapidly spinning black holes 

      Nemmen, Rodrigo S.; Bower, Richard G.; Babul, Arif; Storchi-Bergmann, Thaisa (2007) [Artigo de periódico]
      The power of jets from black holes is expected to depend on both the spin of the black hole and the structure of the accretion disc in the region of the last stable orbit.We investigate these dependencies using two different ...

    • Precessing winds from the nucleus of the prototype Red Geyser? 

      Riffel, Rogemar André; Nemmen, Rodrigo S.; Ilha, Gabriele da Silva; Rembold, Sandro Barboza; Roy, Namrata; Storchi-Bergmann, Thaisa; Riffel, Rogério; Bundy, Kevin; Machado, Alice Deconto; Mallmann, Nícolas Dullius; Schimoia, Jáderson da Silva; Costa, Luiz N. da; Maia, Marcio Antonio Geimba (2019) [Artigo de periódico]
      Supermassive black holes (SMBHs) are present at the centre of most galaxies, with the related mass accretion processes giving origin to outflows in active galactic nuclei (AGNs). It has been presumed that only intense winds ...

    • Radiatively inefficient accretion flow in the nucleus of NGC 1097 

      Nemmen, Rodrigo S.; Storchi-Bergmann, Thaisa; Yuan, Feng; Eracleous, Michael; Terashima, Yuichi; Wilson, Andrew S. (2006) [Artigo de periódico]
      We present a model for the accretion flow around the supermassive black hole in the LINER nucleus of NGC 1097 that fits the optical to X-ray spectral energy distribution (SED). The X-ray segment of the SED is based on ...

    • 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 ...

    • Short timescale variations of the Hα double-peaked profile of the nucleus of NGC 1097 

      Schimoia, Jáderson da Silva; Storchi-Bergmann, Thaisa; Nemmen, Rodrigo S.; Winge, Claudia; Eracleous, Michael (2012) [Artigo de periódico]
      The broad (FWHM ∼ 10,000 km s-ˡ) double-peaked Hα profile from the LINER/Seyfert 1 nucleus of NGC 1097 was discovered in 1991 and monitored for the following 11 years. The profile showed variations attributed to the rotation ...

    • Spectral models for low-luminosity active galactic nuclei in LINERs : the role of advection-dominated accretion and jets 

      Nemmen, Rodrigo S.; Storchi-Bergmann, Thaisa; Eracleous, Michael (2014) [Artigo de periódico]
      We find evidence for a correlation between the accretion rate and jet power and an anticorrelation between the radio loudness and the accretion rate.We confirm previous findings that the radio emission is severely ...

    • The Eddington ratio-dependent ‘changing look’ events in NGC 2992 

      Pereira, Muryel Guolo; Dutra, Daniel Ruschel; Grupe, Dirk; Peterson, Bradley M.; Storchi-Bergmann, Thaisa; Schimoia, Jáderson da Silva; Nemmen, Rodrigo S.; Robinson, Andrew (2021) [Artigo de periódico]
      We present an analysis of historical multiwavelength emission of the `Changing Look’ (CL) Active Galactic Nucleu (AGN) in NGC 2992, covering epochs ranging from 1978 to 2021, as well as new X-ray and optical spectra. The ...