Navegação Ciências Exatas e da Terra por Assunto "Galáxias"

Resultados 1-20 de 131

    • Age distribution of lmc clusters from their integrated ubv colors : history of star formation 

      Girardi, Leo Alberto; Chiosi, Cesare; Bertelli, Gianpaolo; Bressan, Alessandro (1995) [Artigo de periódico]
      In this paper we revise the relationship between ages and metallicities of LMC star clusters and their integrated UBV colors. The study stands on the catalog of UBV colors of the Large Magellanic Cloud (LMC) clusters by ...

    • Analysis of resonances in grand design spiral galaxies 

      Vera Villamizar, Nelson; Dottori, Horacio Alberto; Puerari, Ivanio; Carvalho, Reinaldo Ramos de (2001) [Artigo de periódico]
      We have searched for corotation resonances (CRs) in three southern grand design spiral galaxies : NGC 1365, NGC 1566, and NGC 2997. We have also introduced a method of quantifying errors in the phase diagram used to detect ...

    • 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 ...

    • Atypical Mg-poor Milky Way field stars with globular cluster second-generation-like chemical patterns 

      Fernández-Trincado, José Gregorio; Alves-Brito, Alan; Chanamé, Julio (2017) [Artigo de periódico]
      We report the peculiar chemical abundance patterns of 11 atypical Milky Way (MW) field red giant stars observed by the Apache Point Observatory Galactic Evolution Experiment (APOGEE). These atypical giants exhibit strong ...

    • BASS. XXXV.: The MBH–σ* Relation of 105Month Swift-BAT Type 1 AGNs 

      Caglar, Turgay; Riffel, Rogério; Urry, C. Megan (2023) [Artigo de periódico]
      We present two independent measurements of stellar velocity dispersions (σå) from the Ca II H+K λ3969, 3934 and Mg I b λ 5183, 5172, 5167 region (3880–5550 Å) and the calcium triplet region (8350–8750 Å) for 173 hard ...

    • BS 196 : an old star cluster far from the Small Magellanic Cloud main body 

      Bica, Eduardo Luiz Damiani; Santos Junior, Joao Francisco Coelho dos; Schmidt, Alex Andre (2008) [Artigo de periódico]
      We present B and V photometry of the outlying Small Magellanic Cloud (SMC) star cluster BS 196 with the 4.1-m SOAR telescope. The photometry is deep (to V≈25), showing ≈ 3 mag below the cluster turnoff point at MV = 2.5 ...

    • Buracos negros supermassivos : os monstros que se escondem no centro das galáxias 

      Storchi-Bergmann, Thaisa (2009) [Artigo de periódico]

    • Carbon stars in lmc clusters revisited 

      Marigo, Paola; Girardi, Leo Alberto; Chiosi, Cesare (1996) [Artigo de periódico]
      Examining the available data for AGB stars in the Large Magellanic Cloud (LMC) clusters, we address the question about the mass interval of low- and intermediate-mass stars which eventually evolve into carbon stars (C ...

    • CCD imaging of NGC 4861 : ionized gas properties and stellar formation 

      Cepa, Jordi; Vilchez, Jose M.; Dottori, Horacio Alberto; Barth, Clarissa Silva (1994) [Artigo de periódico]
      This work undertakes the study of the galaxy NGC 4861, using imaging centered at the strong lines Hα, Hβ, [O III] λ5007 and nearby continua. Integrated, absolute fluxes of 28 H II regions, and the region known as the bright ...

    • Chemical abundance analysis of three α-poor, metal-poor stars in the ultrafaint dwarf galaxy Horologium I 

      Nagasawa, Daniel Q.; Santiago, Basilio Xavier; Yanny, Brian (2018) [Artigo de periódico]
      We present chemical abundance measurements of three stars in the ultrafaint dwarf galaxy Horologium I, a Milky Way satellite discovered by the Dark Energy Survey. Using high-resolution spectroscopic observations, we measure ...

    • Collisionless relaxation in gravitacional systems from violent relaxation to gravothermal collapse 

      Levin, Yan; Pakter, Renato; Rizzato, Felipe Barbedo (2008) [Artigo de periódico]
      Theory and simulations are used to study collisionless relaxation of a gravitational N-body system. It is shown that when the initial one-particle distribution function satisfies the virial condition—potential energy is ...

    • Colour evolution models and the distribution of lmc clusters in the integrated ubv plane 

      Girardi, Leo Alberto; Bica, Eduardo Luiz Damiani (1993) [Artigo de periódico]
      We present a comparison between photometric cluster models, based on classical and with-overshooting stellar tracks, and the enlarged sample of 624 LMC clusters recently gathered in integrated UBV photometry by Bica et al. ...

    • Constraints provided by star cluster spectra on the nature of the uv turn-up in giant elliptical galaxies 

      Bica, Eduardo Luiz Damiani; Alloin, Danielle Marie (1988) [Artigo de periódico]
      We have linked available ultraviolet observations to the visible and near infrared spectra of some objects from our star cluster and galaxy nucleus samples. We have analyzed the nature of the UV turn-up in giant elliptical ...

    • Data release 2 of S-PLUS : accurate template-fitting based photometry covering ∼1000 deg2 in 12 optical filters 

      Fernandes, Felipe de Almeida; Bonatto, Charles Jose; Chies-Santos, Ana Leonor; Hartmann, Eduardo Albuquerque; Oliveira, Claudia Lucia Mendes de (2022) [Artigo de periódico]
      The Southern Photometric Local Universe Survey (S-PLUS) is an ongoing survey of ∼9300 deg2 in the southern sky in a 12-band photometric system. This paper presents the second data release (DR2) of S-PLUS, consisting of 514 ...

    • Detection of ca II absorption triplet in a circumnuclear H II region of ngc 3310 

      Terlevich, Elena; Diaz, Angeles I.; Pastoriza, Miriani Griselda; Terlevich, Roberto; Dottori, Horacio Alberto (1990) [Artigo de periódico]
      We have obtained long slit spectrophotometry across NGC 3310, a lurninous galaxy with cucumnuclear bursts of star formation, covering the spectral range from λ3650 to 9700 Å. In one giant star-forrning region, the near-IR ...

    • Digging deeper into the Southern skies : a compact Milky Way companion discovered in first-year Dark Energy Survey data 

      Luque Canaza, Elmer Fidel; Queiroz, Anna Bárbara de Andrade; Santiago, Basilio Xavier; Pieres, Adriano; Balbinot, Eduardo; Bechtol, Keith; Drlica-Wagner, Alex; Fausti Neto, Angelo; Costa, Luiz N. da; Maia, Marcio Antonio Geimba; Yanny, Brian; Abbott, Timothy M. C.; Allam, Sahar S.; Benoit-Lévy, Aurélien; Bertin, Emmanuel; Brooks, D.; Buckley-Geer, Elizabeth; Burke, David Lyle; Carnero Rosell, Aurelio; Carrasco Kind, Matías; Carretero Palacios, Jorge; Cunha, Carlos Eduardo; Desai, S.; Diehl, H. Thomas; Dietrich, Jörg P.; Eifler, Tim; Finley, David A.; Flaugher, Brenna; Fosalba Vela, Pablo; Frieman, Joshua A.; Gerdes, David W.; Gruen, Daniel; Gutierrez, Gaston R.; Honscheid, K.; James, David J.; Kuehn, Kyler; Kuropatkin, Nikolay P.; Lahav, Ofer; Li, T. S.; March, Marisa Cristina; Marshall, Jennifer L.; Martini, Paul; Miquel, Ramon; Neilsen, Eric H.; Nichol, Robert C.; Nord, Brian Dennis; Ogando, Ricardo L.C.; Plazas Malagón, Andrés Alejandro; Romer, Anita K.; Roodman, Aaron; Sanchez-Alvaro, Eusebio; Scarpine, Victor Emanuel; Schubnell, Michael; Sevilla Noarbe, Ignacio; Smith, Robert Christopher; Soares-Santos, Marcelle; Sobreira, Flávia; Suchyta, Eric; Swanson, Molly E. C.; Tarle, Gregory; Thaler, Jon J.; Tucker, Douglas L.; Walker, Alistair; Zhang, Y.; DES Collaboration (2016) [Artigo de periódico]
      We use the first-year Dark Energy Survey (DES) data down to previously unprobed photometric depths to search for stellar systems in the Galactic halo, therefore complementing the previous analysis of the same data carried ...

    • Discovery of an open cluster with a possible physical association with a planetary nebula 

      Bonatto, Charles Jose; Bica, Eduardo Luiz Damiani; Santos Junior, Joao Francisco Coelho dos (2008) [Artigo de periódico]
      We report the discovery of a new open cluster (OC) in the Galaxy at l = 167◦ 0 and b = −1◦ 0. Its field includes the planetary nebula (PN) PK 167−0.1. We study the possible associations of the PN/OC pairs NGC2818/2818A, ...

    • Discovery of a stellar overdensity in Eridanus-Phoenix in the Dark Energy Survey 

      Li, T. S.; Balbinot, Eduardo; Mondrik, Nicholas Payne; Marshall, Jennifer L.; Yanny, Brian; Bechtol, Keith; Drlica-Wagner, Alex; Oscar, Douglas Darcie; Santiago, Basilio Xavier; Simon, Josh D.; Vivas, Anna Katherina; Walker, Alistair; Wang, M.; Abbott, Timothy M. C.; Abdalla, Filipe B.; Benoit-Lévy, Aurélien; Bernstein, Gary M.; Bertin, Emmanuel; Brooks, D.; Burke, David Lyle; Carnero Rosell, Aurelio; Carretero Palacios, Jorge; Costa, Luiz N. da; DePoy, Darren L.; Desai, S.; Diehl, H. Thomas; Doel, Peter; Estrada, Juan; Finley, David A.; Flaugher, Brenna; Frieman, Joshua A.; Gruen, Daniel; Gruendl, Robert A.; Gutierrez, Gaston R.; Honscheid, K.; James, David J.; Kuehn, Kyler; Kuropatkin, Nikolay P.; Lahav, Ofer; Maia, Marcio Antonio Geimba; March, Marisa Cristina; Martini, Paul; Ogando, Ricardo L.C.; Plazas Malagón, Andrés Alejandro; Reil, Kevin; Romer, Anita K.; Roodman, Aaron; Sanchez-Alvaro, Eusebio; Scarpine, Victor Emanuel; Schubnell, Michael; Sevilla Noarbe, Ignacio; Smith, Robert Christopher; Soares-Santos, Marcelle; Sobreira, Flávia; Suchyta, Eric; Swanson, Molly E. C.; Tarle, Gregory; Tucker, Douglas L.; Zhang, Yuanyuan; DES Collaboration (2016) [Artigo de periódico]
      We report the discovery of an excess of main-sequence turnoff stars in the direction of the constellations of Eridanus and Phoenix from the first-year data of the Dark Energy Survey (DES). The Eridanus–Phoenix (EriPhe) ...

    • Discovery of two gravitationally lensed quasars in the Dark Energy Survey 

      Agnello, Adriano; Treu, Tommaso; Ostrovski, F.; Schechter, Paul L.; Buckley-Geer, Elizabeth; Lin, H.; Auger, Matthew W.; Courbin, Frederic Y. M.; Fassnacht, Christopher D.; Frieman, Joshua A.; Kuropatkin, Nikolay P.; Marshall, Phillip J.; McMahon, Richard G.; Meylan, Georges; More, Andrew Mills; Suyu, Sherry; Rusu, Cristian Eduard; Finley, David A.; Abbott, Timothy M. C.; Abdalla, Filipe B.; Allam, Sahar S.; Annis, James T.; Banerji, M.; Benoit-Lévy, Aurélien; 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; Desai, S.; Diehl, H. Thomas; Dietrich, Jörg P.; Doel, Peter; Eifler, Tim; Estrada, Juan; Fausti Neto, Angelo; Flaugher, Brenna; Fosalba Vela, Pablo; Gerdes, David W.; Gruen, Daniel; Gutierrez, Gaston R.; Honscheid, K.; James, David J.; Kent, Stephen M.; Kuehn, Kyler; Kuropatkin, Nikolay P.; Lahav, Ofer; Lima, Marcos Vinicius Borges Teixeira; Maia, Marcio Antonio Geimba; March, Marisa Cristina; Marshall, Jennifer L.; Martini, Paul; Melchior, Peter M.; Miller, Christopher J.; Miquel, Ramon; Nichol, Robert C.; Ogando, Ricardo L.C.; Plazas Malagón, Andrés Alejandro; Reil, Kevin; Romer, Anita K.; Roodman, Aaron; Sako, Masao; Sanchez-Alvaro, Eusebio; Santiago, Basilio Xavier; Scarpine, Victor Emanuel; Schubnell, Michael; Sevilla Noarbe, Ignacio; Smith, Robert Christopher; Soares-Santos, Marcelle; Sobreira, Flávia; Suchyta, Eric; Swanson, Molly E. C.; Tarle, Gregory; Thaler, Jon J.; Tucker, Douglas L.; Walker, Alistair; Wechsler, Risa H.; Zhang, Yuanyuan (2015) [Artigo de periódico]
      We present spectroscopic confirmation of two new gravitationally lensed quasars, discovered in the Dark Energy Survey (DES) and Wide-field Infrared Survey Explorer (WISE) based on their multiband photometry and extended ...