Navegação Ciências Exatas e da Terra por Título

Resultados 2097-2116 de 5955

    • Gaia-IGRINS synergy : orbits of newly identified Milky Way star clusters 

      Garro, Elisa Rita; Fernández-Trincado, José Gregorio; Minniti, Dante; Moya, Wisthon Aby Haro; Palma, Tali; Beers, Timothy C.; Placco, Vinicius M.; Barbuy, Beatriz; Sneden, Chris; Alves-Brito, Alan; Dias, Bruno Moreira de Souza; Afsar, Melike; Frelijj, Heinz; Lane, Richard R. (2023) [Artigo de periódico]
      Context. The recent and exquisite astrometric, photometric, and radial velocity measurements of the Gaia mission resulted in a substantial advancement of the determination of the orbits for old star clusters, including the ...

    • Gaia white dwarfs within 40 pc : I. Spectroscopic observations of new candidates 

      Tremblay, Pier-Emmanuel; Kepler, Souza Oliveira; Torres, Sergio (2020) [Artigo de periódico]
      We present a spectroscopic survey of 230 white dwarf candidates within 40 pc of the Sun from the William Herschel Telescope and Gran Telescopio Canarias. All candidates were selected from Gaia Data Release 2 (DR2) and in ...

    • Galactic archaeology with asteroseismology and spectroscopy : red giants observed by CoRoT and APOGEE 

      Anders, Friedrich; Santiago, Basilio Xavier; Zasowski, G. (2017) [Artigo de periódico]
      With the advent of the space missions CoRoT and Kepler, it has recently become feasible to determine precise asteroseismic masses and relative ages for large samples of red giant stars. We present the CoRoGEE dataset, ...

    • Galaxy clustering, photometric redshifts and diagnosis of systematics in the DES Science Verification data 

      Crocce, Martin; Carretero Palacios, Jorge; Bauer, Anne Hollister; Ross, A.J.; Sevilla Noarbe, Ignacio; Giannantonio,Tommaso; Sobreira, Flávia; Sanchez Lopez, Francisco Javier; Gaztañaga, Enrique; Carrasco Kind, Matías; Sánchez Alonso, Carles; Bonnett, Christopher; Benoit-Lévy, Aurélien; Brunner, Robert J.; Carnero Rosell, Aurelio; Cawthon, Ross; Fosalba Vela, Pablo; Hartley, William; Kim, Edward J.; Leistedt, Boris; Miquel, Ramon; Peiris, Hiranya V.; Percival, Will J.; Rosenfeld, Rogerio; Rykoff, Eli; Sanchez-Alvaro, Eusebio; Abbott, Timothy M. C.; Abdalla, Filipe B.; Allam, Sahar S.; Banerji, M.; Bernstein, Gary M.; Bertin, Emmanuel; Brooks, D.; Buckley-Geer, Elizabeth; Burke, David Lyle; Capozzi, Diego; Castander Serentill, Francisco Javier; Cunha, Carlos Eduardo; D'Andrea, Christopher B.; Costa, Luiz N. da; Desai, S.; Diehl, H. Thomas; Eifler, Tim; Evrard, August E.; Fausti Neto, Angelo; Fernandez, Enrique; Finley, David A.; Flaugher, Brenna; Frieman, Joshua A.; Gerdes, David W.; Gruen, Daniel; Gruendl, Robert A.; Gutierrez, Gaston R.; Honscheid, K.; James, David J.; Kuehn, Kyler; Kuropatkin, Nikolay P.; Lahav, Ofer; Li, T. S.; Lima, Marcos Vinicius Borges Teixeira; Maia, Marcio Antonio Geimba; March, Marisa Cristina; Marshall, Jennifer L.; Martini, Paul; Melchior, Peter M.; Miller, Christopher J.; Neilsen, Eric H.; Nichol, Robert C.; Nord, Brian Dennis; Ogando, Ricardo L.C.; Plazas Malagón, Andrés Alejandro; Romer, Anita K.; Sako, Masao; Santiago, Basilio Xavier; Schubnell, Michael; Smith, Robert Christopher; Soares-Santos, Marcelle; Suchyta, Eric; Swanson, Molly E. C.; Tarle, Gregory; Thaler, Jon J.; Thomas, D.; Vikram, Vinu; Walker, Alistair; Wechsler, Risa H.; Weller, Jochen; Zuntz, J.; DES Collaboration (2016) [Artigo de periódico]
      We study the clustering of galaxies detected at i < 22.5 in the Science Verification observations of the Dark Energy Survey (DES). Two-point correlation functions are measured using 2.3×106 galaxies over a contiguous 116 ...

    • Galaxy cluster mergers as triggers for the formation of jellyfish galaxies : case study of the A901/2 system 

      Ruggiero, Rafael; Machado, Rubens Eduardo Garcia; Oliveira, Fernanda Vitória Roman de; Chies-Santos, Ana Leonor; Lima Neto, Gastão Cesar Bierrenbach; Doubrawa, Lia; Rodríguez del Pino, Bruno (2019) [Artigo de periódico]
      The A901/2 system is a rare case of galaxy cluster interaction, in which two galaxy clusters and two smaller groups are seen in route of collision with each other simultaneously. Within each of the four substructures, ...

    • Galaxy populations in massive galaxy clusters to z = 1.1 : colour distribution, concentration, halo occupation number and red sequence fraction 

      Hennig, C.; Mohr, Joseph J.; Zenteno, Alfredo; Desai, S.; Dietrich, Jörg P.; Bocquet, Sebastian; Strazzullo, Veronica; Saro, Alexandro; Abbott, Timothy M. C.; Abdalla, Filipe B.; Bayliss, Matthew B.; Benoit-Lévy, Aurélien; Bernstein, Gary M.; Bertin, Emmanuel; Brooks, D.; Capasso, Raffaella; Capozzi, Diego; Carnero Rosell, Aurelio; Carrasco Kind, Matías; Carretero Palacios, Jorge; Chiu, I. Non Tim; D'Andrea, Christopher B.; Costa, Luiz N. da; Diehl, H. Thomas; Doel, Peter; Eifler, Tim; Evrard, August E.; Fausti Neto, Angelo; Fosalba Vela, Pablo; Frieman, Joshua A.; Gangkofner, C.; Gonzalez, Anthony; Gruen, Daniel; Gruendl, Robert A.; Gupta, Nayantara; Gutierrez, Gaston R.; Honscheid, K.; Hlavacek-Larrondo, Julie; James, David J.; Kuehn, Kyler; Kuropatkin, Nikolay P.; Lahav, Ofer; March, Marisa Cristina; Marshall, Jennifer L.; Martini, Paul; McDonald, Michael Kenneth; Melchior, Peter M.; Miller, Christopher J.; Miquel, Ramon; Neilsen, Eric H.; Nord, Brian Dennis; Ogando, Ricardo L.C.; Plazas Malagón, Andrés Alejandro; Reichardt, Christian L.; Romer, Anita K.; Rozo, Eduardo; Rykoff, Eli; Sanchez-Alvaro, Eusebio; Santiago, Basilio Xavier; Schubnell, Michael; Sevilla Noarbe, Ignacio; Smith, Robert Christopher; Soares-Santos, Marcelle; Sobreira, Flávia; Stalder, Brian; Stanford, Spencer Adam; Suchyta, Eric; Swanson, Molly E. C.; Tarle, Gregory; Thomas, D.; Vikram, Vinu; Walker, Alistair; Zhang, Yuanyuan (2017) [Artigo de periódico]
      We study the galaxy populations in 74 Sunyaev–Zeldovich effect selected clusters from the South Pole Telescope survey, which have been imaged in the science verification phase of the Dark Energy Survey. The sample extends ...

    • 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 ...

    • 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 ...

    • Gallai-Edmonds decomposition of unicyclic graphs from null space 

      Allem, Luiz Emílio; Jaume, Daniel Alejandro; Molina, Gonzalo; Toledo, Maikon Machado (2022) [Artigo de periódico]
      In this paper, we compute the Gallai-Edmonds decomposition of a unicyclic graph G using linear algebraic tools. More precisely, the Gallai-Edmonds decomposition of G is obtained from the null space associated with adjacency ...

    • Gambling as a teaching aid in the introductory physics laboratory 

      Horoynski-Matsushigue, L.B.; Pascholati, P.R.; Vanin, V.R.; Dias, Johnny Ferraz; Yoneama, Maria Lucia; Siqueira, P.T.D.; Anaku, M.; Duarte, J.L.M. (1998) [Artigo de periódico]
      Dice throwing is used to illustrate relevant concepts of the statistical theory of uncertainties, in particular the meaning of a limiting distribution, the standard deviation, and the standard deviation of the mean. It is ...

    • Gamma-gamma directional correlations for transitions in /sup 84/kr 

      Saxena, Rajendra Narain; Jahnel, Lucia C.; Zawislak, Fernando Claudio (1980) [Artigo de periódico]
      The directional correlation of coincident 'Y transitions in 84Kr have been measured following the decay of 32 min 84Br using a Ge(Li)-Nai(TI) spectrometer. Measurements have been carried out for ten gamma cascades, resulting ...

    • [gamma*p] cross section from the dipole model in momentum space 

      Amaral, João Thiago de Santana; Gay Ducati, Maria Beatriz; Silva, Marcos André Betemps Vaz da; Soyez, Gregory (2007) [Artigo de periódico]
      We reproduce the deep inelastic scattering measurements of the proton structure function at high energy from the dipole model in momentum space. To model the dipole-proton forward scattering amplitude, we use the knowledge ...

    • Gap bifurcations in nonlinear dynamical systems 

      Rizzato, Felipe Barbedo; Pakter, Renato (2002) [Artigo de periódico]
      We investigate the dynamics generated by a type of equation which is common to a variety of physical systems where the undesirable effects of a number of self-consistent nonlinear forces are balanced by an externally imposed ...

    • Gas hydrate dissociation linked to contemporary ocean warming in the southern hemisphere 

      Ketzer, Marcelo; Praeg, Daniel Brian; Rodrigues, Luiz Frederico; Augustin, Adolpho Herbert; Pivel, Maria Alejandra Gómez; Rahmati-Abkenar, Mahboubeh; Miller, Dennis James; Viana, Adriano Roessler; Cupertino, José Antonio (2020) [Artigo de periódico]
      Ocean warming related to climate change has been proposed to cause the dissociation of gas hydrate deposits and methane leakage on the seafloor. This process occurs in places where the edge of the gas hydrate stability ...

    • Gas inflows in the polar ring of NGC 4111 : the birth of an AGN 

      Roier, Gabriel Roberto Hauschild; Storchi-Bergmann, Thaisa; McDermid, Richard; Walsh, Jonelle; Tan, Joanne; Cohn, Jonathan; Krajnovic, Davor; Greene, Jenny E.; Valluri, Monica; Gültekin, Kayhan; Thater, Sabine; Ven, Glenn van de; Gebhardt, Karl; Lützgendorf, Nora; Boizelle, Benjamin; Ma, Chung-Pei; Barth, Aaron J. (2022) [Artigo de periódico]
      We have used Hubble Space Telescope (HST) images, SAURON Integral Field Spectroscopy (IFS), and adaptative optics assisted Gemini NIFS near-infrared K-band IFS to map the stellar and gas distribution, excitation and ...

    • Gas inflows towards the nucleus of NGC 1358 

      Müller, Allan Schnorr; Storchi-Bergmann, Thaisa; Nagar, Neil M.; Robinson, Andrew; Lena, Davide (2017) [Artigo de periódico]
      We use optical spectra from the inner 1.8×2.5 kpc2 of the Seyfert 2 galaxy NGC1358, obtained with the GMOS integral field spectrograph on the Gemini South telescope at a spatial resolution of ≈165 pc, to assess the feeding ...

    • Gas inflows towards the nucleus of the active galaxy NGC 7213 

      Müller, Allan Schnorr; Storchi-Bergmann, Thaisa; Nagar, Neil M.; Ferrari, Fabricio (2014) [Artigo de periódico]
      We present two-dimensional stellar and gaseous kinematics of the inner 0.8 × 1.1 kpc² of the LINER/Seyfert 1 galaxy NGC 7213, from optical spectra obtained with the Gemini Multi- Object Spectrograph integral field spectrograph ...

    • Gas inflows towards the nucleus of the Seyfert 2 galaxy NGC 1667 

      Müller, Allan Schnorr; Storchi-Bergmann, Thaisa; Ferrari, Fabricio; Nagar, Neil M. (2017) [Artigo de periódico]
      We use optical spectra from the inner 2 × 3 kpc2 of the Seyfert 2 galaxy NGC 1667, obtained with the Gemini Multi-Object Spectrograph integral field spectrograph on the Gemini South telescope at a spatial resolution of ...

    • Gas metallicity distributions in SDSS-IV MaNGA galaxies : what drives gradients and local trends? 

      Boardman, Nicholas Fraser; Wild, Vivienne; Heckman, Timothy M.; Sánchez, Sebastián F.; Riffel, Rogério; Riffel, Rogemar André; Zasowski, G. (2023) [Artigo de periódico]
      The gas metallicity distributions across individual galaxies and across galaxy samples can teach us much about how galaxies evolve. Massive galaxies typically possess negative metallicity gradients, and mass and metallicity ...

    • Gas-phase metallicity determinations in nearby AGNs with SDSS-IV MaNGA : evidence of metal-poor accretion 

      Nascimento, Janaina Correa do; Dors Júnior, Oli Luiz; Storchi-Bergmann, Thaisa; Mallmann, Nícolas Dullius; Riffel, Rogério; Ilha, Gabriele da Silva; Riffel, Rogemar André; Rembold, Sandro Barboza; Machado, Alice Deconto; Costa, Luiz N. da; Armah, Mark (2022) [Artigo de periódico]
      We derive the metallicity (traced by the O/H abundance) of the narrow-line region (NLR) of 108 Seyfert galaxies as well as radial metallicity gradients along their galaxy discs and of these of a matched control sample of ...