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

Resultados 1-20 de 104

    • Active galactic nuclei winds as the origin of the H2 emission excess in nearby galaxies 

      Riffel, Rogemar André; Zakamska, Nadia L.; Riffel, Rogério (2020) [Artigo de periódico]
      In most galaxies, the fluxes of rotational H2 lines strongly correlate with star formation diagnostics [such as polycyclic aromatic hydrocarbons (PAHs)], suggesting that H2 emission from warm molecular gas is a minor ...

    • An atlas of Hubble Space Telescope STIS spectra of Seyfert galaxies 

      Spinelli, Patrícia Figueiro; Storchi-Bergmann, Thaisa; Brandt, Carlos Henrique; Calzetti, Daniela (2006) [Artigo de periódico]
      We present a compilation of spectra of 101 Seyfert galaxies obtained with the Hubble Space Telescope (HST ) Space Telescope Imaging Spectrograph (STIS), covering the UV and/or optical spectral range. Information on all the ...

    • 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 ...

    • An Hα nuclear spiral structure in the E0 active galaxy Arp 102B 

      Fathi, Kambiz; Axon, David J.; Storchi-Bergmann, Thaisa; Kharb, Preeti; Robinson, Andrew; Marconi, A.; Maciejewski, Witold B.; Capetti, A. (2011) [Artigo de periódico]
      We report the discovery of a two-armed mini-spiral structure within the inner kiloparsec of the E0 LINER/Seyfert 1 galaxy Arp 102B. The arms are observed in Hα emission and located east and west of the nucleus, extending ...

    • An outflow in the Seyfert ESO 362-G18 revealed by Gemini-GMOS/IFU observations 

      Humire, Pedro K.; Nagar, Neil M.; Finlez, Carolina; Firpo, Verónica; Slater, Roy; Lena, Davide; Soto-Pinto, Pamela; Munõz-Vergara, Dania; Riffel, Rogemar André; Schmitt, Henrique Roberto; Kraemer, S. B.; Müller, Allan Schnorr; Fischer, Travis C.; Robinson, Andrew; Storchi-Bergmann, Thaisa; Crenshaw, Daniel Michael; Elvis, Martin (2018) [Artigo de periódico]
      We present two-dimensional stellar and gaseous kinematics of the inner 0.7 × 1.2 kpc2 of the Seyfert 1.5 galaxy ESO 362-G18, derived from optical (4092–7338 Å) spectra obtained with the GMOS integral field spectrograph on ...

    • An outflow perpendicular to the radio jet in the Seyfert nucleus of NGC 5929 

      Riffel, Rogemar André; Storchi-Bergmann, Thaisa; Riffel, Rogério (2013) [Artigo de periódico]
      We report the observation of an outflow perpendicular to the radio jet in near-infrared integral field spectra of the inner 250 pc of the Seyfert 2 galaxy NGC 5929. The observations were obtained with the Gemini Near-infrared ...

    • Constraints on the broad-line region properties and extinction in local Seyferts 

      Müller, Allan Schnorr; Davies, Richard I.; Korista, Kirk T.; Burtscher, Leonard; Rosario, David; Storchi-Bergmann, Thaisa; Contursi, Alessandra; Genzel, Reinhard; Gracia-Carpio, Javier; Hicks, Erin K. S.; Janssen, Annemieke; Koss, Michael; Lin, Ming-Yi; Lutz, Dieter; Maciejewski, Witold B.; Muller-Sanchez, Francisco; Orban de Xivry, Gilles; Riffel, Rogério; Riffel, Rogemar André; Schartmann, Marc; Sternberg, Amiel; Sturm, Eckhard; Tacconi, Linda J.; Veilleux, Sylvain; Ulrich, Otho Adam (2016) [Artigo de periódico]
      We use high-spectral resolution (R>8000) data covering 3800–13 000 Å to study the physical conditions of the broad-line region (BLR) of nine nearby Seyfert 1 galaxies. Up to six broad HI lines are present in each spectrum. ...

    • A correlation between the stellar and [Fe II] velocity dispersions in active galaxies 

      Riffel, Rogemar André; Storchi-Bergmann, Thaisa; Riffel, Rogério; Pastoriza, Miriani Griselda; Rodriguez-Ardila, Alberto; Dors Júnior, Oli Luiz; Fuchs, Jaciara Tamara; Diniz, Marlon Rodrigo; Schönell Júnior, Astor João; Hennig, Moiré Gonçalves; Brum, Carine (2013) [Artigo de periódico]
      We use near-infrared (near-IR) spectroscopic data from the inner few hundred parsecs of a sample of 47 active galaxies to investigate possible correlations between the stellar velocity dispersion (σ ), obtained from the ...

    • 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 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • Excitation and temperature of extended gas in active galaxies. I Observations 

      Storchi-Bergmann, Thaisa; Wilson, Andrew S.; Binette, Luc; Mulchaey, John Scott (1996) [Artigo de periódico]
      We have obtained long-slit spectroscopy of five active galaxies showing extended high excitation emission lines reaching distances of several kiloparsecs from the nuclei. Measurement of the fluxes of weak lines, such as ...

    • Feeding and feedback in NGC 3081 

      Müller, Allan Schnorr; Storchi-Bergmann, Thaisa; Robinson, Andrew; Lena, Davide; Nagar, Neil M. (2016) [Artigo de periódico]
      We present two-dimensional gaseous kinematics of the inner 1.2 × 1.8 kpc2 of the Seyfert 2 galaxy NGC 3081, from optical spectra (5600–7000 Å) obtained with the Gemini Multi Object Spectrograph integral field spectrograph ...

    • Feeding and feedback in the inner kiloparsec of the active galaxy NGC 2110 

      Müller, Allan Schnorr; Storchi-Bergmann, Thaisa; Nagar, Neil M.; Robinson, Andrew; Lena, Davide; Riffel, Rogemar André; Couto, Guilherme dos Santos (2014) [Artigo de periódico]
      We present two-dimensional gaseous kinematics of the inner 1.1 × 1.6 kpc² of the Seyfert 2 galaxy NGC 2110, from optical spectra (5600–7000 Å) obtained with the GeminiMulti Object Spectrograph integral field spectrograph ...

    • Feeding versus feedback in AGN from near-infrared IFU observations : the case of Mrk 766 

      Schönell Júnior, Astor João; Riffel, Rogemar André; Storchi-Bergmann, Thaisa; Winge, Claudia (2014) [Artigo de periódico]
      We have mapped the emission-line flux distributions and ratios as well as the gaseous kinematics of the inner 450 pc radius of the type 1 Seyfert galaxy Mrk 766 using integral field near-infrared J- and Kl-band spectra ...

    • Feeding versus feedback in NGC 1068 probed with Gemini NIFS – I. Excitation 

      Riffel, Rogemar André; Vale, Tibério Borges; Storchi-Bergmann, Thaisa; McGregor, Peter J. (2014) [Artigo de periódico]
      We present emission-line flux distributions and ratios for the inner ≈200 pc of the narrowline region (NLR) of the Seyfert 2 galaxy NGC 1068, using observations obtained with the Gemini Near-infrared Integral Field ...

    • Feeding versus feedback in NGC4151 probed with Gemini NIFS – I. Excitation 

      Storchi-Bergmann, Thaisa; McGregor, Peter J.; Riffel, Rogemar André; Lopes, Ramiro Duarte Simões; Beck, Tracy; Dopita, Michael A. (2009) [Artigo de periódico]
      We have used the Gemini Near-infrared Integral Field Spectrograph (NIFS) to map the emission-line intensity distributions and ratios in the narrow-line region (NLR) of the Seyfert galaxy NGC4151 in the Z, J, H and K bands ...

    • Feeding versus feedback in NGC4151 probed with Gemini NIFS – II. Kinematics 

      Storchi-Bergmann, Thaisa; Lopes, Ramiro Duarte Simões; McGregor, Peter J.; Riffel, Rogemar André; Beck, Tracy; Martini, Paul (2010) [Artigo de periódico]
      We have used the Gemini Near-infrared Integral Field Spectrograph (NIFS) to map the gas kinematics of the inner ~200 × 500 pc 2 of the Seyfert galaxy NGC4151 in the Z, J, H and K bands at a resolving power of ≥5000 and ...