Browsing Exact and Earth Sciences by Subject "Galaxia"

Now showing items 1-20 of 47

    • Age and metallicity distribution of the galactic bulge from extensive optical and near-IR stellar photometry 

      Zoccali, Manuela; Renzini, Alvio; Ortolani, Sergio; Greggio, Laura; Saviane, Ivo; Cassisi, Santi; Rejkuba, Marina; Barbuy, Beatriz; Rich, Robert Michael; Bica, Eduardo Luiz Damiani (2003) [Journal article]
      We present a new determination of the metallicity distribution, age, and luminosity function of the Galactic bulge stellar population. By combining near-IR data from the 2MASS survey, from the SOFI imager at ESO NTT and ...

    • AL 3 (BH261) : a new globular cluster in the galaxy 

      Ortolani, Sergio; Bica, Eduardo Luiz Damiani; Barbuy, Beatriz (2006) [Journal article]
      AL 3 (BH 261), previously classified as a faint open cluster candidate, is shown to be a new globular cluster in the Milky Way, by means of B, V, and I color-magnitude diagrams. The main feature of AL 3 is a prominent blue ...

    • An independent method for determining the age of the universe 

      Winget, Donald Earl; Liebert, James; Horn, H.M. van; Fontaine, Gilles; Nather, R. Edward; Kepler, Souza Oliveira; Lamb, Donald Q.; Hansen, Carl J.; Hasen, C.J. (1987) [Journal article]
      The oldest white dwarf stars in the solar neighborhood are still observable, and their luminosity distribution can be used to determine directly the age of the Galactic disk and, somewhat less directly, the age of the ...

    • Capture of field stars by globular clusters in dense bulge regions 

      Bica, Eduardo Luiz Damiani; Dottori, Horacio Alberto; Rodrigues, Irapuan; Ortolani, Sergio; Barbuy, Beatriz (1997) [Journal article]
      The recent detection of a double red giant branch (RGB) in the optical color-magnitude diagram of the bulge globular cluster HP 1—a more populated, metal-poor, steep giant branch corresponding to the cluster itself and ...

    • A catalogue of dust clouds in the Galaxy 

      Dutra, Carlos Maximiliano; Bica, Eduardo Luiz Damiani (2002) [Journal article]
      In this study 21 catalogues of dust clouds in the Galaxy were cross-identified by taking into account available properties such as position, angular dimensions, opacity class and velocity. An initial list of ≈6500 entries ...

    • Chemodynamics of the Milky Way I. The first year of APOGEE data 

      Anders, Friedrich; Chiappini, C.C.M.; Santiago, Basilio Xavier; Rocha-Pinto, H.J.; Girardi, Leo Alberto; Costa, Luiz N. da; Maia, Marcio Antonio Geimba; Steinmetz, M.; Minchev, Ivan; Schultheis, Mathias; Boeche, Corrado; Miglio, Andrea; Montalbán, Josefina; Schneider, D.P.; Beers, T.C.; Cunha, Katia; Allende Prieto, Carlos; Balbinot, Eduardo; Bizyaev, D.; Brauer, Dorothée; Brinkmann, Jon; Frinchaboy, P.M.; García Pérez, Ana Elia; Hayden, Michael; Hearty, Frederick R.; Holtzman, J.A.; Johnson, J.A.; Kinemuchi, Karen; Majewski, Steven Raymond; Malanushenko, E.; Malanushenko, V.; Nidever, D.L.; O'Connell, Robert West; Pan, K.; Robin, A.C.; Schiavon, Ricardo P.; Shetrone, M.; Skrutskie, M.F.; Smith, Verne V.; Stassun, Keivan G.; Zasowski, G. (2014) [Journal article]
      Context. The Apache Point Observatory Galactic Evolution Experiment (APOGEE) features the first multi-object high-resolution fiber spectrograph in the near-infrared ever built, thus making the survey unique in its capabilities: ...

    • Constraints on thick disc and halo parameters from HST photometry of field stars in the Galaxy 

      Kerber, Leandro de Oliveira; Javiel, Sandro Caldeira; Santiago, Basilio Xavier (2001) [Journal article]
      We analyse a sample of over 1000 stars from 32 fields imaged in the V and I bands with the Wide Field and Planetary Camera, on board of the Hubble Space Telescope. The fields are located at Galactic latitudes |b| ≥ 15º and ...

    • Deep imaging of Virgo Z : not a nearby ultrafaint dwarf galaxy, but a distant compact group of galaxies 

      Barbuy, Beatriz; Bica, Eduardo Luiz Damiani; Ortolani, Sergio; Souza, André Lopes de (2013) [Journal article]
      Context. The search for Milky Way faint satellite galaxies and star clusters has been intensified in recent years thanks to the Sloan Digital Sky Survey (SDSS), and other efforts to verify candidate objects. Aims. We ...

    • Discovery of three optical open clusters in the Galaxy 

      Bica, Eduardo Luiz Damiani; Bonatto, Charles Jose; Dutra, Carlos Maximiliano (2004) [Journal article]
      We report the discovery of three optical open clusters in the Milky Way. Two clusters are in Scutum (Cluster 1 at = 18.44° and b = −0.42°, and Cluster 2 at l= 19.60° and b = −1.02°), thus projected not far from the Galactic ...

    • Eight new Milky Way companions discovered in first-year Dark Energy Survey data 

      Bechtol, Keith; Drlica-Wagner, Alex; Balbinot, Eduardo; Pieres, Adriano; Simon, Josh D.; Yanny, Brian; Santiago, Basilio Xavier; Wechsler, Risa H.; Frieman, Joshua A.; Walker, Alistair; Williams, P.; Rozo, Eduardo; Rykoff, Eli; Queiroz, Anna Bárbara de Andrade; Luque Canaza, Elmer Fidel; Benoit-Lévy, Aurélien; Tucker, Douglas L.; Sevilla Noarbe, Ignacio; Gruendl, Robert A.; Costa, Luiz N. da; Fausti Neto, Angelo; Maia, Marcio Antonio Geimba; Abbott, Timothy M. C.; Allam, Sahar S.; Armstrong, Robert; Bauer, Anne Hollister; Bernstein, Gary M.; Bernstein, Rebecca A.; Bertin, Emmanuel; Brooks, D.; Buckley-Geer, Elizabeth; Burke, David Lyle; Carnero Rosell, Aurelio; Castander Serentill, Francisco Javier; Covarrubias, Ricardo A.; D'Andrea, Christopher B.; DePoy, Darren L.; Desai, S.; Diehl, H. Thomas; Eifler, Tim; Estrada, Juan; Evrard, August E.; Fernandez, Enrique; Finley, David A.; Flaugher, Brenna; Gaztañaga, Enrique; Gerdes, David W.; Girardi, Leo Alberto; Gladders, Michael David; Gruen, Daniel; Gutierrez, Gaston R.; Hao, Jiangang; Honscheid, K.; Jain, Bhuvnesh; James, David J.; Kent, Stephen M.; Kron, Richard G.; Kuehn, Kyler; Kuropatkin, Nikolay P.; Lahav, Ofer; Li, T. S.; Lin, H.; Makler, Martín; March, Marisa Cristina; Marshall, Jennifer L.; Martini, Paul; Merritt, K. Wyatt; Miller, Christopher J.; Miquel, Ramon; Mohr, Joseph J.; Neilsen, Eric H.; Nichol, Robert C.; Nord, Brian Dennis; Ogando, Ricardo L.C.; Peoples, John; Petravick, Donald L.; Plazas Malagón, Andrés Alejandro; Romer, Anita K.; Roodman, Aaron; Sako, Masao; Sanchez-Alvaro, Eusebio; Scarpine, Victor Emanuel; Schubnell, Michael; Smith, Robert Christopher; Soares-Santos, Marcelle; Sobreira, Flávia; Suchyta, Eric; Swanson, Molly E. C.; Tarle, Gregory; Thaler, Jon J.; Thomas, D.; Wester, William Carl; Zuntz, J.; DES Collaboration (2015) [Journal article]
      We report the discovery of eight new Milky Way companions in ~1800 deg2 of optical imaging data collected during the first year of the Dark Energy Survey (DES). Each system is identified as a statistically significant ...

    • Exploring FSR open cluster candidates within ιΔι = 20º of the Galactic anticentre 

      Bonatto, Charles Jose; Bica, Eduardo Luiz Damiani (2008) [Journal article]
      Context. We investigate the nature of a sample of star cluster candidates detected as stellar overdensities towards the Galactic anticentre. Aims. Taken from the catalogue of Froebrich, Scholz, and Raftery (FSR), the sample ...

    • First cosmology results using SNe Ia from the dark energy survey : analysis, systematic uncertainties, and validation 

      Brout, Dillon J.; Santiago, Basilio Xavier; DES Collaboration (2019) [Journal article]
      We present the analysis underpinning the measurement of cosmological parameters from 207 spectroscopically classified SNe Ia from the first 3 years of the Dark Energy Survey Supernova Program (DES-SN), spanning a redshift ...

    • Foreground and background dust in star cluster directions 

      Dutra, Carlos Maximiliano; Bica, Eduardo Luiz Damiani (2000) [Journal article]
      This paper compares reddening values E(B-V) derived from the stellar content of 103 old open clusters and 147 globular clusters of the Milky Way with those derived from DIRBE/IRAS 100 μm dust emission in the same directions. ...

    • From light to mass : accessing the initial and present-day Galactic globular cluster mass functions 

      Bonatto, Charles Jose; Bica, Eduardo Luiz Damiani (2012) [Journal article]

    • HST NICMOS photometry of the reddened bulge globular clusters NGC 6528, Terzan 5, Liller 1, UKS 1 and Terzan 4 

      Ortolani, Sergio; Barbuy, Beatriz; Bica, Eduardo Luiz Damiani; Renzini, Alvio; Zoccali, Manuela; Rich, Robert Michael; Cassisi, Santi (2001) [Journal article]
      We present results from NICMOS Hubble Space Telescope observations of the reddened bulge globular clusters NGC 6528, Terzan 5, Liller 1, UKS 1 and Terzan 4, obtained through the filters F110W (1.1 μm) and F160W (1.6 μm) ...

    • Integrated spectral analysis of 18 concentrated star clusters in the Small Magellanic Cloud 

      Piatti, Andres E.; Santos Junior, Joao Francisco Coelho dos; Claria Olmedo, Juan Jose; Bica, Eduardo Luiz Damiani; Ahumada, Andrea Veronica; Parisi, M. C. (2005) [Journal article]
      We present in this study flux-calibrated integrated spectra in the range (3600–6800) Å for 18 concentrated SMC clusters. Cluster reddening values were estimated by interpolation between the extinction maps of Burstein & ...

    • Investigating the boderline between a young star cluster and a small stellar association : a test case with Bochum 1 

      Bica, Eduardo Luiz Damiani; Bonatto, Charles Jose; Dutra, Carlos Maximiliano (2008) [Journal article]
      Context. Usually, a loose stellar distribution can be classified as an OB stellar group, an association, or a young open cluster. We compare data with the typical OB association Vul OB1. Aims. Here, we discuss the nature ...

    • Low-extinction windows in the inner Galactic Bulge 

      Dutra, Carlos Maximiliano; Santiago, Basilio Xavier; Bica, Eduardo Luiz Damiani (2002) [Journal article]
      We built K band extinction maps in the area of two candidate low-extinction windows in the inner Bulge: W0.2-2.1 at (l, b) = (0.25°, –2.15° ), and W359.4-3.1 at (l, b) = (359.40°, −3.10°). We employed JH Ks photometry from ...

    • Massive open star clusters using the VVV survey : I. Presentation of the data and description of the approach 

      Chené, André-Nicolas; Borissova, Jura; Clarke, J. R. A.; Bonatto, Charles Jose; Majaess, Daniel J.; Moni Bidin, Christian; Sale, Stuart E.; Mauro, Francesco; Kurtev, Radostin Georgiev; Baume, Gustavo Luis; Feinstein Baigorri, Carlos; Ivanov, Valentin D.; Geisler, Doug; Catelan, Márcio; Minniti, Dante; Lucas, Philip W.; Grijs, Richard de; Kumar, M. S. N. (2012) [Journal article]
      Context. The ESO Public Survey “VISTA Variables in the Vía Láctea” (VVV) provides deep multi-epoch infrared observations for unprecedented 562 sq. degrees of the Galactic bulge, and adjacent regions of the disk. Aims. The ...

    • Matching stellar population models to bulge globular clusters 

      Bruzual A., G.; Barbuy, Beatriz; Ortolani, Sergio; Bica, Eduardo Luiz Damiani; Cuisinier, Francois; Lejeune, Tribault; Schiavon, Ricardo P. (1997) [Journal article]
      We compare observed color-magnitude diagrams (CMDs) of the three metal-rich bulge globular clusters NGC 6553, NGC 6528, and Terzan 5, and integrated spectral energy distributions (SEDs) of NGC 6528, and 47 Tuc, to theoretical ...