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

Resultados 41-60 de 104

    • Ionized outflows in local luminous AGN : what are the real densities and outflow rates? 

      Davies, Richard I.; Baron, Dalya; Shimizu, Taro; Netzer, Hagai; Burtscher, Leonard; De Zeeuw, P. Tim; Genzel, Reinhard; Hicks, Erin K. S.; Koss, Michael; Lin, Ming-Yi; Lutz, Dieter; Maciejewski, Witold B.; Muller-Sanchez, Francisco; Orban de Xivry, Gilles; Ricci, Claudio; Riffel, Rogério; Riffel, Rogemar André; Rosario, David; Schartmann, Marc; Müller, Allan Schnorr; Shangguan, J.; Sternberg, Amiel; Sturm, Eckhard; Storchi-Bergmann, Thaisa; Tacconi, Linda J.; Veilleux, Sylvain (2020) [Artigo de periódico]
      We report on the determination of electron densities, and their impact on the outflow masses and rates, measured in the central few hundred parsecs of 11 local luminous active galaxies. We show that the peak of the integrated ...

    • Is J 133658.3-295105 a radio source at z ≥= 1.0 or at the distance of M 83? 

      Dottori, Horacio Alberto; Díaz, Rubén Joaquín; Mast, Damián (2008) [Artigo de periódico]
      We present Gemini optical imaging and spectroscopy of the radio source J 133658.3–295105. This source has been suggested to be the core of an FR II radio source with two detected lobes. J 133658.3–295105 and its lobes are ...

    • Kinematics and modeling of the inner region of M 83? 

      Rodrigues, Irapuan; Dottori, Horacio Alberto; Díaz, Rubén Joaquín; Agüero, Maria Paz; Mast, Damián (2009) [Artigo de periódico]
      Two-dimensional kinematics of the central region of M 83 (NGC 5236) were obtained through three-dimensional NIR spectroscopy with the Gemini South telescope. The spatial region covered by the integral field unit (∼ 5 ×13 ...

    • Modelling the [Fe II] λ1.644 μm outflow and comparison with H2 and H+ kinematics in the inner 200 pc of NGC 1068 

      Barbosa, Fausto Kuhn Berenguer; Storchi-Bergmann, Thaisa; McGregor, Peter J.; Vale, Tibério Borges; Riffel, Rogemar André (2014) [Artigo de periódico]
      We map the kinematics of the inner (200 pc) narrow-line region (NLR) of the Seyfert 2 galaxy NGC 1068 using the instrument Near-infrared Integral Field Spectrograph and adaptive optics at the Gemini North telescope. Channel ...

    • Molecular hydrogen and [Fe II] in active galactic nuclei 

      Rodriguez-Ardila, Alberto; Pastoriza, Miriani Griselda; Viegas, Sueli Maria Marino; Sigut, T.A.A.; Pradhan, Anil K. (2004) [Artigo de periódico]
      Near-infrared spectroscopy is used to study the kinematics and excitation mechanisms of H2 and [Fe II] lines in a sample of mostly Seyfert 1 galaxies. The spectral coverage allows simultaneous observation of the JHK bands, ...

    • Near-infrared coronal lines in narrow-line Seyfert 1 galaxies 

      Rodriguez-Ardila, Alberto; Viegas, Sueli Maria Marino; Pastoriza, Miriani Griselda; Prato, Lisa A. (2002) [Artigo de periódico]
      We report spectroscopic observations in the wavelength region 0.8–2.4 μm aimed at detecting near-infrared coronal lines in a sample of five narrow-line and one broad-line Seyfert 1 galaxies. Our measurements show that [Si ...

    • Nuclear activity and stellar population of a sample of interacting galaxies 

      Pastoriza, Miriani Griselda; Donzelli, Carlos J.; Bonatto, Charles Jose (1999) [Artigo de periódico]
      In this paper we investigate the nuclear activity and stellar population in a sample of 27 physical galaxy pairs. Equivalent widths of absorption features are used to characterise the nuclear stellar population according ...

    • A nuclear ionized gas outflow in the Seyfert 2 galaxy UGC 2024 

      Munõz-Vergara, Dania; Nagar, Neil M.; Ramakrishnan, Venkatessh; Finlez, Carolina; Storchi-Bergmann, Thaisa; Slater, Roy; Firpo, Verónica; Humire, Pedro K.; Soto-Pinto, Pamela; Kraemer, S. B.; Lena, Davide; Robinson, Andrew; Riffel, Rogemar André; Crenshaw, Daniel Michael; Elvis, Martin; Fischer, Travis C.; Müller, Allan Schnorr; Schmitt, Henrique Roberto (2019) [Artigo de periódico]
      As part of a high-resolution observational study of feeding and feedback processes occurring in the vicinity of the active galactic nucleus in 40 galaxies, we observed the inner 3′′.5 × 5 arcsec of the nearby spiral and ...

    • Nuclear kinematics in nearby AGN-I. An ALMA perspective on the morphology and kinematics of the molecular CO(2–1) emission 

      Ramakrishnan, Venkatessh; Nagar, Neil M.; Finlez, Carolina; Storchi-Bergmann, Thaisa; Slater, Roy; Müller, Allan Schnorr; Riffel, Rogemar André; Mundell, Carole G.; Robinson, Andrew (2019) [Artigo de periódico]
      We present the molecular gas morphology and kinematics of seven nearby Seyfert galaxies obtained from our 230 GHz ALMA observations. The COJ = 2−1 kinematics within the inner ∼30 arcsec (≲9 kpc) reveals rotation patterns ...

    • 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 ...

    • Nuclear spirals as feeding channels to the supermassive black hole : the case of the galaxy NGC 6951 

      Storchi-Bergmann, Thaisa; Dors Júnior, Oli Luiz; Riffel, Rogemar André (2007) [Artigo de periódico]
      We report the discovery of gas streaming motions along nuclear spiral arms toward the LINER nucleus of the galaxyNGC 6951. The observations, obtained using theGMOS integral field spectrograph on the Gemini North telescope, ...

    • 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 ...

    • Outflowing gas in a compact ionization cone in the Seyfert 2 galaxy ESO 153-G20 

      Soto-Pinto, Pamela; Nagar, Neil M.; Finlez, Carolina; Ramakrishnan, Venkatessh; Munõz-Vergara, Dania; Slater, Roy; Humire, Pedro K.; Storchi-Bergmann, Thaisa; Lena, Davide; Kraemer, S. B.; Fischer, Travis C.; Schmitt, Henrique Roberto; Riffel, Rogemar André; Müller, Allan Schnorr; Robinson, Andrew; Crenshaw, Daniel Michael; Elvis, Martin (2019) [Artigo de periódico]
      We present two-dimensional ionized gas and stellar kinematics in the inner 1.4 × 1.9 kpc2 of the Seyfert 2 galaxy ESO 153-G20 obtained with the Gemini-South/Gemini multi-object spectrograph integral field unit (GMOS-IFU) ...

    • Outflows in the inner kiloparsec of NGC1566 as revealed by molecular (ALMA) and ionized gas (Gemini-GMOS/IFU) kinematics 

      Slater, Roy; Nagar, Neil M.; Müller, Allan Schnorr; Storchi-Bergmann, Thaisa; Finlez, Carolina; Lena, Davide; Ramakrishnan, Venkatessh; Mundell, Carole G.; Riffel, Rogemar André; Peterson, Bradley M.; Robinson, Andrew; Orellana, Gustavo (2019) [Artigo de periódico]
      Context. Tracing nuclear inflows and outflows in active galactic nuclei (AGNs), determining the mass of gas involved in them, and their impact on the host galaxy and nuclear black hole requires 3D imaging studies of both ...

    • A panchromatic spatially resolved study of the inner 500 pc of NGC 1052 : II. Gas excitation and kinematics 

      Hahn, Luis Gabriel Dahmer; Riffel, Rogério; Ricci, Tiago Vecchi; Steiner, João Evangelista; Storchi-Bergmann, Thaisa; Riffel, Rogemar André; Menezes, Roberto Bertoldo; Dametto, Natacha Zanon; Diniz, Marlon Rodrigo; Motter, Juliana Cristina; Dutra, Daniel Ruschel (2019) [Artigo de periódico]
      We map the optical and near-infrared (NIR) emission-line flux distributions and kinematics of the inner 320×535 pc2of the elliptical galaxy NGC 1052. The integral field spectra were obtained with the Gemini Telescope using ...

    • Photometry and kinematics of two minor merger candidate galaxies 

      Gimeno, Germán; Dottori, Horacio Alberto; Díaz, Rubén Joaquín; Rodrigues, Irapuan; Carranza, Gustavo Jose (2007) [Artigo de periódico]
      We observationally investigate the properties of disk galaxies undergoing minor merger or capture events. In this context, the properties of two double-nucleus candidate galaxies, ESO 381–IG23 andMCG 3-35-14, are analyzed. ...

    • Powerful ionized gas outflows in the interacting radio galaxy 4C+29.30 

      Couto, Guilherme dos Santos; Storchi-Bergmann, Thaisa; Siemiginowska, Aneta L.; Riffel, Rogemar André; Morganti, Raffaellla H. (2020) [Artigo de periódico]
      We investigate the ionized gas excitation and kinematics in the inner 4.3 × 6.2 kpc2 of the merger radio galaxy 4C+29.30. Using optical integral field spectroscopy with the Gemini North Telescope, we present flux distributions, ...

    • Probing nuclear starburst activity in a sample of nearby spiral galaxies 

      Bonatto, Charles Jose; Pastoriza, Miriani Griselda; Alloin, Danielle Marie; Bica, Eduardo Luiz Damiani (1998) [Artigo de periódico]
      As part of a systematic study of the UV properties of galaxies in the IUE library,we present in this paper an analysis of nuclear stellar populations in spiral galaxies with radial velocity ≤ 5 000kms-ˡ. In this sample of ...

    • 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 ...

    • Separating c-Stars from dust in the central region of the Seyfert 2 galaxy NGC 1241 

      Dottori, Horacio Alberto; Díaz, Rubén Joaquín; Carranza, Gustavo Jose; Lipari, Sebastian; Santos Junior, Joao Francisco Coelho dos (2005) [Artigo de periódico]
      The Seyfert 2 galaxy NGC 1241 presents a 1.5 kpc large circumnuclear ring (CNR) of star formation embracing a small bar plus leading arms. Those structures are Paα emitters but barely seen in Haα. It also presents stellar ...