Navegação Ciências Exatas e da Terra por Assunto "Galaxies: stellar content"

Resultados 1-20 de 73

    • 2D stellar population and gas kinematics of the inner 1.5 kpc of the post-starburst quasar SDSS J0210−0903 

      Sanmartim, David; Storchi-Bergmann, Thaisa; Brotherton, Mike (2013) [Artigo de periódico]
      Post-starburst quasars (PSQs) are hypothesized to represent a stage in the evolution of massive galaxies in which the star formation has been recently quenched due to the feedback of the nuclear activity. In this paper, ...

    • 2D stellar population and gas kinematics of the inner kiloparsec of the post-starburst quasar SDSS J0330−0532 

      Sanmartim, David; Storchi-Bergmann, Thaisa; Brotherton, Mike (2014) [Artigo de periódico]
      We have used optical Integral Field Spectroscopy in order to map the star formation history of the inner kiloparsec of the post-starburst quasar (PSQ) J0330−0532 and to map its gas and stellar kinematics as well as the gas ...

    • An atlas of calcium triplet spectra of active galaxies 

      Garcia-Rissmann, Aurea; Neme, Luis Rodolfo Vega; Asari, Natalia Vale; Fernandes Junior, Roberto Cid; Schmitt, Henrique Roberto; González Delgado, Rosa M.; Storchi-Bergmann, Thaisa (2005) [Artigo de periódico]
      We present a spectroscopic atlas of active galactic nuclei covering the region around the λλ8498, 8542, 8662 calcium triplet (CaT). The sample comprises 78 objects, divided into 43 Seyfert 2s, 26 Seyfert 1s, three starburst ...

    • Anisotropic emission stellar population and x-ray sources in the seyfert 2 galaxy eso 138 - g01 

      Schmitt, Henrique Roberto; Storchi-Bergmann, Thaisa (1995) [Artigo de periódico]
      We present narrow-band CCD images of the high-excitation Seyfert 2 galaxy ES0138-G01, centred on the emission tines [O III] λ5007, Hα+[N II] λλ6548, 6584 and adjacent continua. The continuum-subtracted [O III] image presents ...

    • Anisotropic high-excitation emission and chemical abundances in the Seyfert 2 galaxy NGC 5643 

      Schmitt, Henrique Roberto; Storchi-Bergmann, Thaisa; Baldwin, Jack A. (1994) [Artigo de periódico]
      We present narrow-band images in the lines [O III] λ5007 and Hα(+ [N II] λλ6548, 6584 and long-slit spec­ troscopy along the bar of the Seyfert 2 galaxy NGC 5643. The continuum subtracted [O III] and Hα( images show that ...

    • Constraints on the star formation history of the Large Magellanic Cloud 

      Javiel, Sandro Caldeira; Santiago, Basilio Xavier; Kerber, Leandro de Oliveira (2005) [Artigo de periódico]
      We present the analysis of deep colour–magnitude diagrams (CMDs) of 6 stellar fields in the LMC. The data were obtained using HST/WFPC2 in the F814W (∼I) and F555W (∼V) filters, reaching V555 ∼ 26.5.We discuss and apply a ...

    • Determining star formation rates in active galactic nuclei hosts via stellar population synthesis 

      Riffel, Rogério; Mallmann, Nícolas Dullius; Ilha, Gabriele da Silva; Storchi-Bergmann, Thaisa; Riffel, Rogemar André; Rembold, Sandro Barboza; Bizyaev, D.; Nascimento, Janaina Correa do; Schimoia, Jáderson da Silva; Costa, Luiz N. da; Boardman, Nicholas Fraser; Boquien, Médéric; Couto, Guilherme dos Santos (2021) [Artigo de periódico]
      The effect of active galactic nuclei (AGNs) feedback on the host galaxy, and its role in quenching or enhancing star formation, is still uncertain due to the fact that usual star formation rate (SFR) indicators – emission-line ...

    • Exploring the AGN-merger connection in Arp 245 : I: nuclear star formation and gas outflow in NGC 2992 

      Pereira, Muryel Guolo; Dutra, Daniel Ruschel; Storchi-Bergmann, Thaisa; Müller, Allan Schnorr; Fernandes, Roberto Cid; Couto, Guilherme dos Santos; Dametto, Natacha Zanon; Hernández Jiménez, José Andrés (2021) [Artigo de periódico]
      Galaxy mergers are central to our understanding of galaxy formation, especially within the context of hierarchical models. Besides having a large impact on the star formation history, mergers are also able to influence gas ...

    • Farthest neighbor : the distant Milky Way satellite Eridanus II 

      Li, T. S.; Simon, Josh D.; Drlica-Wagner, Alex; Bechtol, Keith; Wang, M.; García-Bellido, Juan; Frieman, Joshua A.; Marshall, Jennifer L.; James, David J.; Strigari, Louis E.; Pace, Andrew B.; Balbinot, Eduardo; Zhang, Yuanyuan; Abbott, Timothy M. C.; Allam, Sahar S.; Benoit-Lévy, Aurélien; Bernstein, Gary M.; Bertin, Emmanuel; Brooks, D.; Burke, David Lyle; Carnero Rosell, Aurelio; Carrasco Kind, Matías; Carretero Palacios, Jorge; Cunha, Carlos Eduardo; D'Andrea, Christopher B.; Costa, Luiz N. da; DePoy, Darren L.; Desai, S.; Diehl, H. Thomas; Eifler, Tim; Flaugher, Brenna; Goldstein, Daniel Abraham; Gruen, Daniel; Gruendl, Robert A.; Gschwend, Julia de Figueiredo; Gutierrez, Gaston R.; Krause, Elisabeth; Kuehn, Kyler; Lin, H.; Maia, Marcio Antonio Geimba; March, Marisa Cristina; Menanteau, Felipe; Miquel, Ramon; Plazas Malagón, Andrés Alejandro; Romer, Anita K.; Sanchez-Alvaro, Eusebio; Santiago, Basilio Xavier; Schubnell, Michael; Sevilla Noarbe, Ignacio; Smith, Robert Christopher; Sobreira, Flávia; Suchyta, Eric; Tarle, Gregory; Thomas, D.; Tucker, Douglas L.; Walker, Alistair; Wechsler, Risa H.; Wester, William Carl; Yanny, Brian; DES Collaboration (2017) [Artigo de periódico]
      We present Magellan/IMACS spectroscopy of the recently discovered Milky Way satellite EridanusII (Eri II). We identify 28 member stars in EriII, from which we measure a systemic radial velocity of vhel = 75.6 1.3 (stat.) ...

    • Field galaxies at intermediate redshift (0.2 < z < 0.8) in the direction of the galaxy cluster LCDCS-S001 

      Krabbe, Angela Cristina; Rembold, Sandro Barboza; Pastoriza, Miriani Griselda (2007) [Artigo de periódico]
      We present a spectroscopic and photometric analysis for eight field galaxies in the direction of the galaxy cluster LCDCS-S001. The spectra were obtained with the GMOS instrument at the Gemini South Observatory. The objects ...

    • Galaxy properties in different environments. II. Star formation in bulges of late-type spirals 

      Bica, Eduardo Luiz Damiani; Maia, Marcio Antonio Geimba; Bonatto, Charles Jose; Dottori, Horacio Alberto; Pastoriza, Miriani Griselda (1994) [Artigo de periódico]
      The star formation history in the nucleus of late spiral galaxies is compared between a sample in a high galaxy density medium (HDS) and a control sample (CS) of isolated galaxies. We have observed 20 HDS and 18 CS galaxies ...

    • 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 ...

    • Hst observations of the field star population in the large magellanic cloud 

      Elson, Rebecca A.W.; Gilmore, Gerard Fitzgerald; Santiago, Basilio Xavier (1997) [Artigo de periódico]
      We present V and I photometry, obtained with the Hubble Space Telescope, for ~ 15 800 stars in a field in the inner disc of the Large Magellanic Cloud. We confirm previous results indicating that an intense star formation ...

    • Integral field spectroscopy of the inner kpc of the elliptical galaxy NGC 5044 

      Diniz, Suzi Izaquiel Ferreira; Pastoriza, Miriani Griselda; Hernández Jiménez, José Andrés; Riffel, Rogério; Ricci, Tiago Vecchi; Steiner, João Evangelista; Riffel, Rogemar André (2017) [Artigo de periódico]
      We used Gemini Multi-Object Spectrograph in the integral field unit mode to map the stellar population, emission-line flux distributions and gas kinematics in the inner kpc of NGC 5044. From the stellar populations synthesis, ...

    • 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 ...

    • Intermediate-age stars as the origin of low stellar velocity dispersion nuclear rings : the case of Mrk 1157 

      Riffel, Rogério; Riffel, Rogemar André; Ferrari, Fabricio; Storchi-Bergmann, Thaisa (2011) [Artigo de periódico]
      We have used theGeminiNear-Infrared Integral-Field Spectrograph to map the age distribution of the stellar population in the inner 400 pc of the Seyfert 2 galaxy Mrk 1157 (NGC 591), at a spatial resolution of 35 pc. We ...

    • J-PLUS : a catalogue of globular cluster candidates around the M 81/M 82/NGC 3077 triplet of galaxies 

      Chies-Santos, Ana Leonor; Souza, Rafael da Silva de; Caso, Juan Pablo; Ennis, Ana; Souza , Camila P. E. de; Barbosa, Renan S.; Chen, Peng; Cenarro, Andres Javier; Ederoclite, Alessandro; Cristóbal-Hornillos, David; Hernández-Monteagudo, Carlos; López-Sanjuan, Carlos; Marín-Franch, Antonio; Moles Villamate, Mariano; Varela, Jesús; Vázquez Ramió, Héctor; Dupke, Renato de Alencar; Sodre Junior, Laerte; Angulo, Raúl E. (2022) [Artigo de periódico]
      Globular clusters (GCs) are proxies of the formation assemblies of their host galaxies. However, few studies exist targeting GC systems of spiral galaxies up to several effective radii. Through 12-band Javalambre Photometric ...

    • J-PLUS : impact of bars on quenching timescales in nearby green valley disc galaxies 

      Nogueira-Cavalcante, João Paulo; Chies-Santos, Ana Leonor; Tempel, Elmo (2019) [Artigo de periódico]
      Context. Between the blue cloud and the red sequence peaks on the galaxy colour–magnitude diagram there is a region sparsely populated by galaxies called the green valley. In a framework where galaxies mostly migrate on ...

    • J-PLUS : two-dimensional analysis of the stellar population in NGC 5473 and NGC 5485 

      San Roman, Izaskun; Chies-Santos, Ana Leonor; Sodre Junior, Laerte (2019) [Artigo de periódico]
      Context. The spatial variations of stellar population properties within a galaxy are intimately related to their formation process. Therefore, spatially resolved studies of galaxies are essential to uncover their formation ...

    • 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 ...