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

Resultados 1-20 de 25

    • 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 ...

    • Bridge over troubled gas : clusters and associations under the SMC and LMC tidal stresses 

      Bica, Eduardo Luiz Damiani; Santiago, Basilio Xavier; Bonatto, Charles Jose; Dias, Rafael Augusto Garcia; Kerber, Leandro de Oliveira; Dias, Bruno Moreira de Souza; Barbuy, Beatriz; Balbinot, Eduardo (2015) [Artigo de periódico]
      We obtained Southern Astrophysical Research telescope B and V photometry of 14 star clusters and two associations in the Bridge tidal structure connecting the Large and Small Magellanic Cloud (LMC and SMC). These objects ...

    • BV surface photometry of southern galaxies. I. NGC 4507 

      Storchi-Bergmann, Thaisa; Pastoriza, Miriani Griselda (1986) [Artigo de periódico]
      From B and V photographic surface photometry we have obtained photometric parameters, mean­ luminosity profiles, and B- V color indices for the barred spiral galaxy NGC 4507. The decomposition of the mean-luminosity B ...

    • Circumnuclear structures in the interacting Seyfert galaxy NGC 1241 : kinematics and optical/infrared morphology 

      Díaz, Rubén Joaquín; Dottori, Horacio Alberto; Vera Villamizar, Nelson; Carranza, Gustavo Jose (2003) [Artigo de periódico]
      We studied the spiral pattern in the inner 6".5 (1" = 257 pc) central regions of the interacting active nucleus galaxy NGC 1241 using Gemini North Telescope high-resolution Ks- and J-band images and Hubble Space Telescope ...

    • A Comparison between the narrow-line regions of Seyfert 1 and Seyfert 2 galaxies 

      Schmitt, Henrique Roberto; Kinney, Anne Louise (1996) [Artigo de periódico]
      We present high-resolution narrow-band [O III] images of Seyfert 1 and Seyfert galaxies, obtained in the Hubble Space Telescope Data Archive. The continuum-subtr cted [O III] images were useto measure the narrow-line region ...

    • Deep colour-magnitude diagrams of LMC field stars imaged with HST 

      Castro, Rodrigo; Santiago, Basilio Xavier; Gilmore, Gerard Fitzgerald; Beaulieu, Sylvie F.; Johnson, Rachel A. (2001) [Artigo de periódico]
      We present deep photometry …V < ~26† in V and I bands obtained with the Wide Field and Planetary Camera 2 on board the Hubble Space Telescope for 7 fields ~5◦ away from the Large Magellanic Cloud centre. The fields contain, ...

    • Deep surface photometry of edge-on spirals in Abell galaxy clusters constraining environmental effects 

      Santiago, Basilio Xavier; Vale, Tibério Borges (2008) [Artigo de periódico]
      Context. There is a clear scarcity of structural parameters for stellar thick discs, especially for spiral galaxies located in high-density regions, such as galaxy clusters and compact groups. Aims. We have modelled the ...

    • Galaxy properties in different environments. I. The sample 

      Maia, Marcio Antonio Geimba; Pastoriza, Miriani Griselda; Bica, Eduardo Luiz Damiani; Dottori, Horacio Alberto (1994) [Artigo de periódico]
      This paper presents two galaxy samples, respectively in a high and in a low local density environments that were generated from the SSRS catalog using objective criteria. A preliminary comparison of physical properties in ...

    • 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 ...

    • Multicolor photometric properties of six early-type galaxies 

      Saraiva, Maria de Fátima Oliveira; Ferrari, Fabricio; Pastoriza, Miriani Griselda (1999) [Artigo de periódico]
      We present BV RI CCD surface photometry for 4 elliptical and 2 S0 galaxies that show bright emission lines in their nuclear spectra. We obtained isophote maps, luminosity profiles, and basic photometric parameters. We also ...

    • 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 ...

    • Pattern speed of main spiral arms in NGC 2997 

      Grosbol, Preben; Dottori, Horacio Alberto (2009) [Artigo de periódico]
      Context. Bright knots along arms are observed in K-band images of many grand-design spiral galaxies. They are identified as young starforming complexes using K-band spectra which show strong Brγ emission. Their alignment ...

    • SDSS-IV MaNGA : excavating the fossil record of stellar populations in spiral galaxies 

      Peterken, Thomas G.; Merrifield, Michael; Aragón-Salamanca, Alfonso; Fraser-McKelvie, Amelia; Avila-Reese, Vladimir; Riffel, Rogério; Knapen, Johan Hendrik; Drory, Niv (2020) [Artigo de periódico]
      We perform a ‘fossil record’ analysis for ≈800 low-redshift spiral galaxies, using STARLIGHT applied to integral field spectroscopic observations from the SDSS-IV MaNGA survey to obtain fully spatially resolved high-resolution ...

    • SDSS-IV MaNGA : properties of galaxies with kinematically decoupled stellar and gaseous components 

      Jin, Yifei; Chen, Yanmei; Shi, Yong; Tremonti, Christy A.; Bershady, Matthew A.; Merrifield, Michael; Emsellem, Eric; Fu, Hai; Wake, D.A.; Bundy, Kevin; Lin, Lihwai; Argudo-Fernández, Maria; Huang, Song; Stark, David V.; Storchi-Bergmann, Thaisa; Bizyaev, D.; Brownstein, Joel R.; Chisholm, John P.; Guo, Qi; Hao, Lei; Hu, Jian; Li, Cheng; Li, Ran; Masters, K.L.; Malanushenko, E.; Pan, K.; Riffel, Rogemar André; Roman-Lopes, Alexandre; Simmons, Audrey E.; Thomas, D.; Wang, Lan; Westfall, Kyle B.; Yan, Renbin (2016) [Artigo de periódico]
      We study the properties of 66 galaxies with kinematically misaligned gas and stars from MaNGA survey. The fraction of kinematically misaligned galaxies varies with galaxy physical parameters, i.e. M∗, SFR and sSFR. According ...

    • SMC west halo : a slice of the galaxy that is being tidally stripped? Star clusters trace age and metallicity gradients 

      Dias, Bruno Moreira de Souza; Kerber, Leandro de Oliveira; Barbuy, Beatriz; Bica, Eduardo Luiz Damiani; Ortolani, Sergio (2016) [Artigo de periódico]
      Context. The evolution and structure of the Magellanic Clouds is currently under debate. The classical scenario in which both the Large and Small Magellanic Clouds (LMC, SMC) are orbiting the Milky Way has been challenged ...

    • Spatial distributions of young Large Magellanic Cloud clusters and tracers of a bar pertubation 

      Dottori, Horacio Alberto; Bica, Eduardo Luiz Damiani; Claria Olmedo, Juan Jose; Puerari, Ivanio (1996) [Artigo de periódico]
      The spatial distributions of SWB I [10<~t(Myr)30]<~ and SWB II [30<~t(Myr)<~70] LMC clusters are analyzed using the enlarged sample of integrated V BV photometry of star clusters and associations published by Bica et ai. ...

    • Star formation in grand-design, spiral galaxies : young, massive clusters in the near-infrared 

      Grosbol, Preben; Dottori, Horacio Alberto (2012) [Artigo de periódico]
      Aims. Spiral structure is a prominent feature in many disk galaxies and is often outlined by bright, young objects. We study the distribution of young stellar clusters in grand-design spiral galaxies and thereby determine ...

    • Star-forming knots and density wave in NGC 2997 

      Grosbol, Preben; Dottori, Horacio Alberto; Gredel, Roland (2006) [Artigo de periódico]
      Context. Many grand design spiral galaxies show strings of bright knots along their arms on near-infrared K-band images. The alignment of such knots suggests a relation to the spiral pattern and possibly to a large-scale, ...

    • Statistics of young starforming complexes in spiral galaxies using NIR photometry 

      Grosbol, Preben; Dottori, Horacio Alberto (2008) [Artigo de periódico]
      Aims. Very young stellar clusters and cluster complexes may be embedded in dust lanes along spiral arms in disk galaxies and escape detection in visual bands. Observations in the near-infrared K-band offer an almost unbiased ...

    • A strong correlation between circumnuclear dust and black hole accretion in early-type galaxies 

      Lopes, Ramiro Duarte Simões; Storchi-Bergmann, Thaisa; Saraiva, Maria de Fátima Oliveira; Martini, Paul (2007) [Artigo de periódico]
      We present a detailed investigation of the incidence of circumnuclear dust structure in a large, well-matched sample of early-type galaxies with and without active galactic nuclei (AGNs). All 34 early-type AGN hosts in our ...