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

Resultados 21-40 de 104

    • First detection of the 448 GHz H2O transition in space 

      Pereira-Santaella, Miguel; González-Alfonso, Eduardo; Usero, Antonio; Garcia-Burillo, Santiago; Martín-Pintado, Jesús M.; Colina, Luis; Alonso-Herrero, Almudena; Arribas, Santiago; Cazzoli, Sara; Rico Villas, Fernando; Rigopoulou, Dimitra; Storchi-Bergmann, Thaisa (2017) [Artigo de periódico]
      We present the first detection of the ortho-H2O 423􀀀330 transition at 448 GHz in space. We observed this transition in the local (z = 0:010) luminous infrared (IR) galaxy ESO 320-G030 (IRAS F11506-3851) using the Atacama ...

    • Gas inflows towards the nucleus of NGC 1358 

      Müller, Allan Schnorr; Storchi-Bergmann, Thaisa; Nagar, Neil M.; Robinson, Andrew; Lena, Davide (2017) [Artigo de periódico]
      We use optical spectra from the inner 1.8×2.5 kpc2 of the Seyfert 2 galaxy NGC1358, obtained with the GMOS integral field spectrograph on the Gemini South telescope at a spatial resolution of ≈165 pc, to assess the feeding ...

    • Gas inflows towards the nucleus of the active galaxy NGC 7213 

      Müller, Allan Schnorr; Storchi-Bergmann, Thaisa; Nagar, Neil M.; Ferrari, Fabricio (2014) [Artigo de periódico]
      We present two-dimensional stellar and gaseous kinematics of the inner 0.8 × 1.1 kpc² of the LINER/Seyfert 1 galaxy NGC 7213, from optical spectra obtained with the Gemini Multi- Object Spectrograph integral field spectrograph ...

    • Gas inflows towards the nucleus of the Seyfert 2 galaxy NGC 1667 

      Müller, Allan Schnorr; Storchi-Bergmann, Thaisa; Ferrari, Fabricio; Nagar, Neil M. (2017) [Artigo de periódico]
      We use optical spectra from the inner 2 × 3 kpc2 of the Seyfert 2 galaxy NGC 1667, obtained with the Gemini Multi-Object Spectrograph integral field spectrograph on the Gemini South telescope at a spatial resolution of ...

    • Gas properties of H II and starburst galaxies : relation with the stellar population 

      Raimann, Daniel Iunes; Storchi-Bergmann, Thaisa; Bica, Eduardo Luiz Damiani; Melnick, Jorge; Schmitt, Henrique Roberto (2000) [Artigo de periódico]
      We study the gas emission of galaxies with active star formation, consisting mostly of H II and starburst galaxies, as well as some Seyfert 2 galaxies, and determine chemical and physical parameters. The data consist of ...

    • Gas rotation, shocks and outflow within the inner 3 kpc of the radio galaxy 3C 33 

      Couto, Guilherme dos Santos; Storchi-Bergmann, Thaisa; Müller, Allan Schnorr (2017) [Artigo de periódico]
      We present optical integral field spectroscopy – obtained with the Gemini Multi-Object Spectrograph – of the inner 4.0 × 5.8 kpc2 of the narrow line radio galaxy 3C 33 at a spatial resolution of 0.58 kpc. The gas emission ...

    • Gas streaming motions towards the nucleus of M81 

      Müller, Allan Schnorr; Storchi-Bergmann, Thaisa; Riffel, Rogemar André; Ferrari, Fabricio; Steiner, João Evangelista; Axon, David J.; Robinson, Andrew (2011) [Artigo de periódico]
      We present two-dimensional stellar and gaseous kinematics of the inner 120×250 pc2 of the LINER/Seyfert 1 galaxy M81, from optical spectra obtained with the Gemini Multi-Object Spectrograph (GMOS) integral field spectrograph ...

    • Gemini/GMOS IFU gas velocity 'tomography' of the narrow line region of nearby active galaxies 

      Barbosa, Fausto Kuhn Berenguer; Storchi-Bergmann, Thaisa; Fernandes Junior, Roberto Cid; Winge, Claudia; Schmitt, Henrique Roberto (2009) [Artigo de periódico]
      We present two-dimensional (2D) mapping of the gas velocity field of the inner few hundred parsecs of six nearby active galaxies, using spectra obtained with the integral field unit of the Gemini Multi-Object Spectrograph ...

    • Gemini/GMOS integral field unit stellar kinematics of the nuclear region of six nearby active galaxies 

      Barbosa, Fausto Kuhn Berenguer; Storchi-Bergmann, Thaisa; Fernandes Junior, Roberto Cid; Winge, Claudia; Schmitt, Henrique Roberto (2006) [Artigo de periódico]
      We present 2D mapping of the stellar velocity field within the inner 5 arcsec of six nearby active galaxies, using spectra obtained with the Integral Field Unit (IFU) of the Gemini Multi-Object Spectrograph instrument at ...

    • Gemini NIFS survey of feeding and feedback in nearby active galaxies III. Ionized versus warm molecular gas masses and distributions 

      Schönell Júnior, Astor João; Storchi-Bergmann, Thaisa; Riffel, Rogemar André; Riffel, Rogério; Bianchin, Marina; Hahn, Luis Gabriel Dahmer; Diniz, Marlon Rodrigo; Dametto, Natacha Zanon (2019) [Artigo de periódico]
      We have used the Gemini Near-Infrared Integral Field Spectrograph in the J and K bands to map the distribution, excitation, and kinematics of the ionized H ii and warm molecular gas H2, in the inner few 100 pc of six nearby ...

    • Gemini NIFS survey of feeding and feedback in nearby active galaxies : IV. Excitation 

      Riffel, Rogemar André; Bianchin, Marina; Riffel, Rogério; Storchi-Bergmann, Thaisa; Schönell Júnior, Astor João; Hahn, Luis Gabriel Dahmer; Dametto, Natacha Zanon; Diniz, Marlon Rodrigo (2021) [Artigo de periódico]
      The near-infrared spectra of active galactic nuclei (AGN) present emission lines of different atomic and molecular species. The mechanisms involved in the origin of these emission lines in AGN are still not fully understood. ...

    • Gemini NIFS survey of feeding and feedback processes in nearby active galaxies : II. The sample and surface mass density profilesthe hidden monster and its outflow 

      Riffel, Rogemar André; Storchi-Bergmann, Thaisa; Riffel, Rogério; Davies, Richard I.; Bianchin, Marina; Diniz, Marlon Rodrigo; Schönell Júnior, Astor João; Burtscher, Leonard; Crenshaw, Daniel Michael; Fischer, Travis C.; Hahn, Luis Gabriel Dahmer; Dametto, Natacha Zanon; Rosario, David (2018) [Artigo de periódico]
      We present and characterize a sample of 20 nearby Seyfert galaxies selected for having BAT 14–195 keV luminosities LX ≥ 1041.5 erg s−1, redshift z ≤ 0.015, being accessible for observations with the Gemini Near-Infrared ...

    • Hidden trigger for the giant starburst arc in M83? 

      Díaz, Rubén Joaquín; Dottori, Horacio Alberto; Agüero, Maria Paz; Mediavilla, Evencio; Rodrigues, Irapuan; Mast, Damián (2006) [Artigo de periódico]
      The huge star formation events that occur at some galactic centers do not provide enough clues as to their origin, since the morphological signatures of the triggering mechanism are smeared out in the timescale of a few ...

    • Host galaxy properties of changing-look AGNs revealed in the MaNGA survey 

      Yu, Xiaoling; Shi, Yong; Chen, Yanmei; Chen, Jianhang; Li, Songlin; Bing, Longji; Ge, Junqiang; Riffel, Rogemar André; Riffel, Rogério (2020) [Artigo de periódico]
      Changing-look active galactic nuclei (CL-AGNs) are a subset of AGNs in which the broad Balmer emission lines appear or disappear within a few years. We use the Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) ...

    • Imaging of mgb starbursts - II. The nature of the sample 

      Coziol, Roger; Barth, Clarissa Silva; Demers, Serge (1995) [Artigo de periódico]
      In this paper, broad-band imaging in BVRI is used in parallel with information from long-slit spectroscopy and IRAS data to study star formation processes in a sample of 15 MBG (Montreal blue galaxy) starbursts, in order ...

    • Infrared emission in Seyfert 2 galaxies : reprocessed radiation from a dusty torus? 

      Storchi-Bergmann, Thaisa; Mulchaey, John Scott; Wilson, Andrew S. (1992) [Artigo de periódico]
      The nature of the infrared continuum in Seyfert 2 galaxies is not well understood. An attractive model is one in which dust grains near the nucleus are heated by optical and ultraviolet photons from a central source and ...

    • Insights on the dusty torus and neutral torus from optical and X-ray obscuration in a complete volume limited hard X-ray AGN sample 

      Davies, Richard I.; 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; Ricci, Claudio; Riffel, Rogério; Riffel, Rogemar André; Schartmann, Marc; Müller, Allan Schnorr; Sternberg, Amiel; Sturm, Eckhard; Tacconi, Linda J.; Veilleux, Sylvain (2015) [Artigo de periódico]
      We describe a complete volume limited sample of nearby active galaxies selected by their 14–195 keV luminosity, and outline its rationale for studying the mechanisms regulating gas inflow and outflow. We also describe a ...

    • Integral field spectroscopy of the circum-nuclear region of the radio Galaxy Pictor A 

      Couto, Guilherme dos Santos; Storchi-Bergmann, Thaisa; Robinson, Andrew; Riffel, Rogemar André; Kharb, Preeti; Lena, Davide; Müller, Allan Schnorr (2016) [Artigo de periódico]
      We present optical integral field spectroscopy of the inner 2.5 × 3.4 kpc2 of the broad-line radio galaxy Pictor A, at a spatial resolution of ≈400 pc. Line emission is observed over the whole field of view, being strongest ...

    • Intermediate-age stars as origin of the low-velocity dispersion nuclear ring in Mrk 1066 

      Riffel, Rogemar André; Storchi-Bergmann, Thaisa; Riffel, Rogério; Pastoriza, Miriani Griselda (2010) [Artigo de periódico]
      We report the first two-dimensional stellar population synthesis in the near-infrared of the nuclear region of an active galaxy, namely, Mrk 1066. We have used integral field spectroscopy with adaptative optics at the ...

    • Ionized gas kinematics within the inner kiloparsec of the Seyfert galaxy NGC 1365 

      Lena, Davide; Robinson, Andrew; Storchi-Bergmann, Thaisa; Couto, Guilherme dos Santos; Müller, Allan Schnorr; Riffel, Rogemar André (2016) [Artigo de periódico]
      We observed the nuclear region of the galaxy NGC 1365 with the integral field unit of the Gemini Multi Object Spectrograph mounted on the GEMINI-South telescope. The field of view covers 13 × 6 arcsec2(1173 × 541 pc2) ...