Navegação Ciências Exatas e da Terra por Assunto "Galaxia"

Resultados 21-40 de 47

    • New Galactic star clusters discovered in the VVV survey 

      Borissova, Jura; Bonatto, Charles Jose; Kurtev, Radostin Georgiev; Clarke, J. R. A.; Peñaloza, Francisco; Sale, Stuart E.; Minniti, Dante; Alonso Garcia, Javier; Artigau, Étienne; Barbá, Rodolfo H.; Bica, Eduardo Luiz Damiani; Baume, Gustavo Luis; Catelan, Márcio; Chené, André-Nicolas; Dias, Bruno Moreira de Souza; Folkes, S. L.; Froebrich, Dirk; Geisler, Doug; Grijs, Richard de; Hanson, M. M.; Hempel, Maren; Ivanov, Valentin D.; Kumar, M. S. N.; Lucas, Philip W.; Mauro, Francesco; Moni Bidin, Christian; Rejkuba, Marina; Saito, Roberto K.; Tamura, Motohide; Toledo, Ignacio (2011) [Artigo de periódico]
      Context. VISTA Variables in the Vía Láctea (VVV) is one of the six ESO Public Surveys operating on the new 4-m Visible and Infrared Survey Telescope for Astronomy (VISTA). VVV is scanning the Milky Way bulge and an adjacent ...

    • New galactic star clusters discovered in the VVV survey. Candidates projected on the inner disk and bulge 

      Borissova, Jura; Chené, André-Nicolas; Ramírez Alegría, Sebastián; Sharma, S.; Clarke, J. R. A.; Kurtev, Radostin Georgiev; Negueruela, Ignacio; Marco Tobarra, Amparo; Amigo, Pia; Minniti, Dante; Bica, Eduardo Luiz Damiani; Bonatto, Charles Jose; Catelan, Márcio; Fierro, C.; Geisler, Doug; Gromadzki, Mariusz; Hempel, Maren; Hanson, M. M.; Ivanov, Valentin D.; Lucas, Philip W.; Majaess, Daniel J.; Moni Bidin, Christian; Popescu, Bogdan; Saito, Roberto K. (2014) [Artigo de periódico]
      Context. VISTA Variables in the Vía Láctea (VVV) is one of six ESO Public Surveys using the 4 meter Visible and Infrared Survey Telescope for Astronomy (VISTA). The VVV survey covers the Milky Way bulge and an adjacent ...

    • New infrared star clusters in the Northern and Equatorial Milky Way with 2MASS 

      Bica, Eduardo Luiz Damiani; Dutra, Carlos Maximiliano; Soares, Jules Batista; Barbuy, Beatriz (2003) [Artigo de periódico]
      We carried out a survey of infrared star clusters and stellar groups on the 2MASS J, H and Ks all-sky release Atlas in the Northern and Equatorial Milky Way (350◦ < < 360◦, 0◦ < < 230◦). The search in this zone complements ...

    • New infrared star clusters in the southern Milky Way with 2MASS 

      Dutra, Carlos Maximiliano; Bica, Eduardo Luiz Damiani; Soares, Jules Batista; Barbuy, Beatriz (2003) [Artigo de periódico]
      We carried out a 2MASS J, H and Ks survey of infrared star clusters in the Milky Way sector 230º < l < 350º . This zone was the least studied in the literature, previously including only 12 infrared clusters or stellar ...

    • A new Milk Way halo star cluster in the southern galactic sky 

      Balbinot, Eduardo; Santiago, Basilio Xavier; Costa, Luiz N. da; Maia, Marcio Antonio Geimba; Majewski, Steven Raymond; Nidever, D.L.; Rocha-Pinto, H.J.; Thomas, D.; Wechsler, Risa H.; Yanny, Brian (2013) [Artigo de periódico]
      We report on the discovery of a new Milky Way (MW) companion stellar system located at (αJ 2000, δJ 2000) = (22h10 m 43 s. 15,14º56'58".8). The discovery was made using the eighth data release of SDSS after applying an ...

    • NGC 2180 : a disrupting open cluster? 

      Bonatto, Charles Jose; Bica, Eduardo Luiz Damiani; Pavani, Daniela Borges (2004) [Artigo de periódico]
      The spatial dependence of luminosity and mass functions of evolved open clusters is discussed in this work using J and H 2MASS photometry, which allows a wide spatial coverage and proper background determination. The target ...

    • Ngc 6603 : a young rich open cluster towards the bulge 

      Bica, Eduardo Luiz Damiani; Ortolani, Sergio; Barbuy, Beatriz (1993) [Artigo de periódico]
      We present B, V colour magnitude diagrams of the rich open cluster NGC 6603. A foreground reddening of E(B- V)f = 0.50 and an internal one of E(B- V)i = 0.29 were derived with the additional help of integrated spectra. The ...

    • NTT infrared imaging of star cluster candidates towards the central parts of the Galaxy 

      Dutra, Carlos Maximiliano; Ortolani, Sergio; Bica, Eduardo Luiz Damiani; Barbuy, Beatriz; Zoccali, Manuela; Momany, Yazan (2003) [Artigo de periódico]
      We address the issue whether the central parts of the Galaxy harbour young clusters other than Arches, Quintuplet and the Nuclear Young Cluster. A large sample of centrally projected cluster candidates has been recently ...

    • On the possible generation of the young massive open clusters Stephenson 2 and BDSB122 by ω Centauri 

      Salerno, Gustavo Malta; Bica, Eduardo Luiz Damiani; Bonatto, Charles Jose; Rodrigues, Irapuan (2009) [Artigo de periódico]
      Context. Passing through the disk of a galaxy, a massive object such as a globular cluster can trigger star formation. Aims. We test the hypothesis that the most massive globular cluster in the Galaxy, ωCentauri, which ...

    • Photometric and structural properties of NGC 6544 : a combined VVV-Hubble Space Telescope study 

      Cohen, Roger; Mauro, Francesco; Geisler, Doug; Moni Bidin, Christian; Dotter, Aaron Loveren; Bonatto, Charles Jose (2014) [Artigo de periódico]
      We combine archival Hubble Space Telescope imaging with wide-field near-infrared photometry to study the neglected metal-poor Galactic globular cluster NGC 6544. A high spatial resolution map of differential reddening over ...

    • Properties of five low-contrast open clusters in the third quadrant 

      Bica, Eduardo Luiz Damiani; Bonatto, Charles Jose (2005) [Artigo de periódico]
      We derive photometric, structural and dynamical evolution-related parameters of five as yet unstudied low-contrast open clusters located in the third quadrant using 2MASS data. The target clusters are Czernik 31, Czernik ...

    • Search for gamma-ray emission from DES dwarf spheroidal galaxy candidates with Fermi-LAT data 

      Drlica-Wagner, Alex; Albert, Andrea; Bechtol, Keith; Wood, Matthew Dunseth; Strigari, Louis E.; Sánchez-Conde, Miguel A.; Baldini, Luca; Essig, Rouven; Cohen-Tanugi, Johann; Anderson, Brandon; Bellazzini, Ronaldo; Bloom, Elliott D.; Caputo, Regina; Cecchi, Claudia; Charles, Eric Andre; Chiang, James; De Angelis, Alessandro; Funk, Stefan; Fusco, Piergiorgio; Gargano, Fabio; Giglietto, Nico; Giordano, Francesco; Guiriec, Sylvain; Gustafsson, Michael; Kuss, Michael; Loparco, Francesco; Lubrano, Pasquale; Mirabal, N.; Mizuno, Tsunefumi; Morselli, Aldo; Ohsugi, Takashi; Orlando, Elena; Persic, Massimo; Raino, Silvia; Spada, Francesca Romana; Suson, Daniel J.; Zaharijas, Gabrijela; Zimmer, Stephan; Abbott, Timothy M. C.; Allam, Sahar S.; Balbinot, Eduardo; Bauer, Anne Hollister; Benoit-Lévy, Aurélien; Bernstein, Rebecca A.; Bernstein, Gary M.; Bertin, Emmanuel; Brooks, D.; Buckley-Geer, Elizabeth; Burke, David Lyle; Carnero Rosell, Aurelio; Castander Serentill, Francisco Javier; Covarrubias, Ricardo A.; D'Andrea, Christopher B.; Costa, Luiz N. da; DePoy, Darren L.; Desai, S.; Diehl, H. Thomas; Cunha, Carlos Eduardo; Eifler, Tim; Estrada, Juan; Evrard, August E.; Fausti Neto, Angelo; Fernandez, Enrique; Finley, David A.; Flaugher, Brenna; Frieman, Joshua A.; Gaztañaga, Enrique; Gerdes, David W.; Gruen, Daniel; Gruendl, Robert A.; Gutierrez, Gaston R.; Honscheid, K.; Jain, Bhuvnesh; James, David J.; Jeltema, Tesla E.; Kent, Stephen M.; Kron, Richard G.; Kuehn, Kyler; Kuropatkin, Nikolay P.; Lahav, Ofer; Li, T. S.; Luque Canaza, Elmer Fidel; Maia, Marcio Antonio Geimba; Makler, Martín; March, Marisa Cristina; Marshall, Jennifer L.; Martini, Paul; Merritt, K. Wyatt; Miller, Christopher J.; Miquel, Ramon; Mohr, Joseph J.; Neilsen, Eric H.; Nord, Brian Dennis; Ogando, Ricardo L.C.; Peoples, John; Petravick, Donald L.; Pieres, Adriano; Plazas Malagón, Andrés Alejandro; Queiroz, Anna Bárbara de Andrade; Romer, Anita K.; Roodman, Aaron; Rykoff, Eli; 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.; Thomas, D.; Tucker, Douglas L.; Walker, Alistair; Wechsler, Risa H.; Wester, William Carl; Williams, P.; Yanny, Brian; Zuntz, J.; Fermi LAT Collaboration; DES Collaboration (2015) [Artigo de periódico]
      Due to their proximity, high dark-matter (DM) content, and apparent absence of non-thermal processes, Milky Way dwarf spheroidal satellite galaxies (dSphs) are excellent targets for the indirect detection of DM. Recently, ...

    • Stellar kinematics and metallicities in the ultra-faint dwarf galaxy Reticulum II 

      Simon, Josh D.; Drlica-Wagner, Alex; Li, T. S.; Nord, Brian Dennis; Geha, Marla; Bechtol, Keith; Balbinot, Eduardo; Buckley-Geer, Elizabeth; Lin, H.; Marshall, Jennifer L.; Santiago, Basilio Xavier; Strigari, Louis E.; Wang, M.; Wechsler, Risa H.; Yanny, Brian; Abbott, Timothy M. C.; Bauer, Anne Hollister; Bernstein, Gary M.; Bertin, Emmanuel; Brooks, D.; Burke, David Lyle; Capozzi, Diego; Carnero Rosell, Aurelio; Carrasco Kind, Matías; D'Andrea, Christopher B.; Costa, Luiz N. da; DePoy, Darren L.; Desai, S.; Diehl, H. Thomas; Dodelson, Scott; Cunha, Carlos Eduardo; Estrada, Juan; Evrard, August E.; Fausti Neto, Angelo; Fernandez, Enrique; Finley, David A.; Flaugher, Brenna; Frieman, Joshua A.; Gaztañaga, Enrique; Gerdes, David W.; Gruen, Daniel; Gruendl, Robert A.; Honscheid, K.; James, David J.; Kent, Stephen M.; Kuehn, Kyler; Kuropatkin, Nikolay P.; Lahav, Ofer; Maia, Marcio Antonio Geimba; March, Marisa Cristina; Martini, Paul; Miller, Christopher J.; Miquel, Ramon; Ogando, Ricardo L.C.; Romer, Anita K.; Roodman, Aaron; Romer, Anita K.; Sako, Masao; Sanchez-Alvaro, Eusebio; 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.; Vikram, Vinu; Walker, Alistair; Wester, William Carl; DES Collaboration (2015) [Artigo de periódico]
      We present Magellan/M2FS, Very Large Telescope/GIRAFFE, and Gemini South/GMOS spectroscopy of the newly discovered Milky Way satellite Reticulum II. Based on the spectra of 25 Ret II member stars selected from Dark Energy ...

    • A survey of early-type stars based on the Two Micron All Sky Survey database 

      Ortiz, Roberto Pereira; Malacarne, Marcio; Wilhelm, Ronald; Costa, R. D. D.; Rossi, Silvia; Maciel, Walter Junqueira (2007) [Artigo de periódico]
      We report the results of a spectroscopic survey of blue stars near the south Galactic pole, selected according to their color indices in the 2MASS database. The main scope of this work is to determine the nature of the ...

    • Target selection for the Apache Point Observatory Galactic Evolution Experiment (APOGEE) 

      Zasowski, G.; Johnson, J.A.; Frinchaboy, P.M.; Majewski, Steven Raymond; Nidever, D.L.; Rocha-Pinto, H.J.; Girardi, Leo Alberto; Andrews, Brett H.; Chojnowski, Stephen Drew; Cudworth, Kyle McC.; Jackson, Kelly M.; Munn, Jeffrey, A.; Skrutskie, M.F.; Beaton, Rachael Lynn; Blake, Cullen H.; Covey, Kevin; Deshpande, Rohit; Epstein, Courtney; Fabbian, Damian; Fleming, S.W.; García-Hernández, D. A.; Herrero Davó, Artemio; Mahadevan, Suvrath; Mészáros, S.; Schultheis, Mathias; Sellgren, K.; Terrien, Ryan C.; van Saders, Jennifer L.; Allende Prieto, Carlos; Bizyaev, D.; Burton, Adam; Cunha, Katia; Costa, Luiz N. da; Hasselquist, Sten; Hearty, Frederick R.; Holtzman, J.A.; García Pérez, Ana Elia; Maia, Marcio Antonio Geimba; O'Connell, Robert West; O’Donnell, C.; Pinsonneault, Marc H.; Santiago, Basilio Xavier; Schiavon, Ricardo P.; Shetrone, M.; Smith, Verne V.; Wilson, J.C. (2013) [Artigo de periódico]
      The Apache Point Observatory Galactic Evolution Experiment (APOGEE) is a high-resolution infrared spectroscopic survey spanning all Galactic environments (i.e., bulge, disk, and halo), with the principal goal of constraining ...

    • The dark energy survey : prospects for resolved stellar populations 

      Rossetto, Bruno M.; Santiago, Basilio Xavier; Girardi, Leo Alberto; Camargo, Júlio I.B. de; Balbinot, Eduardo; Costa, Luiz N. da; Yanny, Brian; Maia, Marcio Antonio Geimba; Makler, Martín; Ogando, Ricardo L.C.; Pellegrini, Paulo Sérgio de Souza; Ramos, Beatriz H.F.; De Simoni, Fernando S.; Armstrong, Robert Ellis; Bertin, Emmanuel; Desai, S.; Kuropatkin, Nikolay P.; Lin, H.; Mohr, Joseph J.; Tucker, Douglas L. (2011) [Artigo de periódico]
      Wide angle and deep surveys, regardless of their primary purpose, always sample a large number of stars in the Galaxy and in its satellite system. Here we make a forecast of the expected stellar sample resulting from the ...

    • The embedded star clysters in the nebulae vdB-RN 92 and Gy 3-7 in Canis Majoris R1 

      Soares, Jules Batista; Bica, Eduardo Luiz Damiani (2003) [Artigo de periódico]
      We employed J, H and Ks photometry from the 2MASS Point Source Catalogue to study the embedded star clusters in the nebulae vdB-RN 92 and Gy 3–7, which are located in the molecular cloud Canis Majoris R1. We employed ...

    • The Gaia-ESO survey : radial metallicity gradients and age-metallicity relation of stars in the Milky Way disk 

      Bergemann, Maria; Ruchti, Gregory; Serenelli, Aldo M.; Feltzing, Sofia; Alves-Brito, Alan; Asplund, Martin; Bensby, Thomas L.; Gruyters, Pieter; Heiter, Ulrike; Hourihane, Anna; Korn, Andreas J.; Lind, Karin; Marino, Anna F.; Jofre, Paula; Nordlander, Thomas; Ryde, Nils A. E.; Worley, Clare C.; Gilmore, Gerard Fitzgerald; Randich, Sofia; Ferguson, Annette M. N.; Jeffries, Rob D.; Micela, Giuseppina; Negueruela, Ignacio; Prusti, Timo; Rix, H.-W.; Vallenari, Antonella; Alfaro, Emilio Javier; Allende Prieto, Carlos; Bragaglia, Angela; Koposov, Sergey E.; Lanzafame, Alessandro C.; Pancino, Elena; Recio-Blanco, Alejandra; Smiljanic, Rodolfo Henrique Silva; Walton, Nicholas A.; Costado, María Teresa; Franciosini, Elena; Hill, Vanessa; Lardo, Carmela; De Laverny, Patrick‏; Magrini, Laura; Maiorca, Enrico; Masseron, Thomas; Morbidelli, Lorenzo; Sacco, Germano; Kordopatis, Georges; Tautvaišiene, Gražina (2014) [Artigo de periódico]
      We study the relationship between age, metallicity, and α-enhancement of FGK stars in the Galactic disk. The results are based upon the analysis of high-resolution UVES spectra from the Gaia-ESO large stellar survey. We ...

    • The globular cluster NGC 6642 : evidence for a depleted mass function in a very old cluster 

      Balbinot, Eduardo; Santiago, Basilio Xavier; Bica, Eduardo Luiz Damiani; Bonatto, Charles Jose (2009) [Artigo de periódico]
      We present photometry for the globular cluster NGC6642 using the F606W and F814W filters with the Advanced Camera for Surveys in the Wide Field Channel (ACS/WFC) third generation camera on board of Hubble Space Telescope. ...

    • The old galactic open cluster FSR 1716 and Czernik 23 

      Bonatto, Charles Jose; Bica, Eduardo Luiz Damiani (2008) [Artigo de periódico]
      Context. Open clusters older than ~4 Gyr are rare in the Galaxy. Affected by a series of mass-decreasing processes, the stellar content of most open clusters dissolves into the field on a time-scale shorter than ~1 Gyr. ...