Navegação Ciências Exatas e da Terra por Assunto "Galaxias espirais"

Resultados 1-16 de 16

    • Ages and metallicities of circumnuclear star formation regions from Gemini IFU observations 

      Dors Júnior, Oli Luiz; Storchi-Bergmann, Thaisa; Riffel, Rogemar André; Schmidt, Alex Andre (2008) [Artigo de periódico]
      Aims. We derive the age and metallicity of circumnuclear star formation regions (CNSFRs) located in the spiral galaxies NGC6951 and NGC1097 and investigate the cause of the very low equivalent widths of emission lines found ...

    • 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 ...

    • Disentangling age and metallicity effects in the blueish nuclear population of m 33, ngc 278 and ngc 404 

      Schmidt, Alex Andre; Bica, Eduardo Luiz Damiani; Alloin, Danielle Marie (1990) [Artigo de periódico]
      In this study, we have applied to the blueish nuclei of the spiral galaxies M33 and NGC 278 and to the dwarf lenticular NGC 404, a population synthesis method relying upon a base of star clusters, over the range 3700-9700 ...

    • 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 ...

    • 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 ...

    • 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 ...

    • Probing the near-infrared stellar population of Seyfert galaxies 

      Riffel, Rogério; Pastoriza, Miriani Griselda; Rodriguez-Ardila, Alberto; Bonatto, Charles Jose (2009) [Artigo de periódico]
      We employ Infrared Telescope Facility SpeX near-infrared (NIR; 0.8–2.4 μm) spectra to investigate the stellar population (SP), active galactic nuclei (AGN) featureless continuum (FC) and hot dust properties in nine Sy 1 ...

    • 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 : star-formation-driven biconical outflows in the local universe 

      Bizyaev, D.; Chen, Yanmei; Shi, Yong; Riffel, Rogemar André; Riffel, Rogério; Diamond-Stanic, Aleksandar M.; Roy, Namrata (2019) [Artigo de periódico]
      We present a sample of 48 nearby galaxies with central, biconical outflows identified by the Mapping Nearby Galaxies at APO survey. All considered galaxies have star-formation-driven biconical (SFB) central outflows, with ...

    • SDSS-IV MaNGA : stellar population gradients within barred galaxies 

      Fraser-McKelvie, Amelia; Merrifield, Michael; Aragón-Salamanca, Alfonso; Peterken, Thomas G.; Masters, K.L.; Krawczyk, Coleman M.; Andrews, Brett H.; Knapen, Johan Hendrik; Kruk, Sandor J.; Schaefer, Adam L.; Smethurst, Rebecca J.; Riffel, Rogério; Brownstein, Joel R.; Drory, Niv (2019) [Artigo de periódico]
      Bars in galaxies are thought to stimulate both inflow of material and radial mixing along them. Observational evidence for this mixing has been inconclusive so far, however, limiting the evaluation of the impact of bars ...

    • 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 ...

    • Surface photometry and spectral analysis of Mk50 : a Seyfert 1 nucleus in an early type galaxy 

      Pastoriza, Miriani Griselda; Bica, Eduardo Luiz Damiani; Bonatto, Charles Jose; Mediavilla, Evencio; Pérez Jiménez, Enrique (1991) [Artigo de periódico]
      We analyze Markarian 50 using V and I CCD frames and IPCS and CCD spectra, respectively, obtained in June 1985 (low state of activity) and May 1990 (high state), covering the range 3200 Å<λ<10 100 Å. The surface brightness ...

    • The effects of the interactions on the kinematics, stellar population and metallicity of AM2322−821 with Gemini/GMOS 

      Krabbe, Angela Cristina; Pastoriza, Miriani Griselda; Winge, Claudia; Rodrigues, Irapuan; Dors Júnior, Oli Luiz; Ferreiro, Diego L. (2011) [Artigo de periódico]
      We present an observational study of the impacts of the interactions on the kinematics, stellar populations and oxygen abundances of the components of the galaxy pair AM2322−821. A fairly symmetric rotation curve for the ...

    • The plane W(Na I) x W (Mg I) : effects of interstellar Na I in a sample of southern galaxies 

      Bica, Eduardo Luiz Damiani; Pastoriza, Miriani Griselda; Maia, Marcio Antonio Geimba; Silva, Luiz Augusto Leitão da; Dottori, Horacio Alberto (1991) [Artigo de periódico]
      Galaxy spectra from a subsample of the Southern Sky Redshift Survey data bank were used to study the equivalent width plane for the lines Na I λ 5893 Å vs Mg I λ 5175 Å. We try to estimate how important the contribution ...

    • Time-slicing spiral galaxies with SDSS-IV MaNGA 

      Peterken, Thomas G.; Fraser-McKelvie, Amelia; Aragón-Salamanca, Alfonso; Merrifield, Michael; Kraljic, Katarina; Knapen, Johan Hendrik; Riffel, Rogério; Brownstein, Joel R.; Drory, Niv (2019) [Artigo de periódico]
      Spectra of galaxies contain a wealth of information about the stellar populations from which they are made. With integral field unit (IFU) surveys, such data can be used to map out stellar population properties across the ...