Listar Ciencias Exactas y Naturales por tema "Dinamica estelar"

Mostrando ítems 1-20 de 21

    • An outflow in the Seyfert ESO 362-G18 revealed by Gemini-GMOS/IFU observations 

      Humire, Pedro K.; Nagar, Neil M.; Finlez, Carolina; Firpo, Verónica; Slater, Roy; Lena, Davide; Soto-Pinto, Pamela; Munõz-Vergara, Dania; Riffel, Rogemar André; Schmitt, Henrique Roberto; Kraemer, S. B.; Müller, Allan Schnorr; Fischer, Travis C.; Robinson, Andrew; Storchi-Bergmann, Thaisa; Crenshaw, Daniel Michael; Elvis, Martin (2018) [Artículo de periódico]
      We present two-dimensional stellar and gaseous kinematics of the inner 0.7 × 1.2 kpc2 of the Seyfert 1.5 galaxy ESO 362-G18, derived from optical (4092–7338 Å) spectra obtained with the GMOS integral field spectrograph on ...

    • 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) [Artículo de periódico]
      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 correlation between the stellar and [Fe II] velocity dispersions in active galaxies 

      Riffel, Rogemar André; Storchi-Bergmann, Thaisa; Riffel, Rogério; Pastoriza, Miriani Griselda; Rodriguez-Ardila, Alberto; Dors Júnior, Oli Luiz; Fuchs, Jaciara Tamara; Diniz, Marlon Rodrigo; Schönell Júnior, Astor João; Hennig, Moiré Gonçalves; Brum, Carine (2013) [Artículo de periódico]
      We use near-infrared (near-IR) spectroscopic data from the inner few hundred parsecs of a sample of 47 active galaxies to investigate possible correlations between the stellar velocity dispersion (σ ), obtained from the ...

    • Dynamical studies of cluster pairs in the magellanic clouds 

      Oliveira, Marcio Ramos de; Dottori, Horacio Alberto; Bica, Eduardo Luiz Damiani (1998) [Artículo de periódico]
      We performed N-body simulations of star cluster encounters with Hernquist’s TREECODE in a CRAY YMP-2E computer under different initial conditions (relative positions and velocities, cluster sizes, masses and concentration ...

    • Exploring the AGN-merger connection in Arp 245 : I: nuclear star formation and gas outflow in NGC 2992 

      Pereira, Muryel Guolo; Dutra, Daniel Ruschel; Storchi-Bergmann, Thaisa; Müller, Allan Schnorr; Fernandes, Roberto Cid; Couto, Guilherme dos Santos; Dametto, Natacha Zanon; Hernández Jiménez, José Andrés (2021) [Artículo de periódico]
      Galaxy mergers are central to our understanding of galaxy formation, especially within the context of hierarchical models. Besides having a large impact on the star formation history, mergers are also able to influence gas ...

    • Final stages of N-body star cluster encounters 

      Oliveira, Marcio Ramos de; Bica, Eduardo Luiz Damiani; Dottori, Horacio Alberto (2000) [Artículo de periódico]
      We performed numerical simulations of star cluster encounters with Hernquist's treecode on a CRAY YMP-2E computer. We used different initial conditions (relative positions and velocities, cluster sizes, masses and concentration ...

    • Investigating potential planetary nebula/cluster pairs 

      Moni Bidin, Christian; Majaess, Daniel J.; Bonatto, Charles Jose; Mauro, Francesco; Turner, D. G.; Geisler, Doug; Chené, André-Nicolas; Gormaz-Matamala, Alex C.; Borissova, Jura; Kurtev, Radostin Georgiev; Minniti, Dante; Carraro, Giovanni; Gieren, Wolfgang P. (2014) [Artículo de periódico]
      Context. Fundamental parameters characterizing the end-state of intermediate-mass stars may be constrained by discovering planetary nebulae (PNe) in open clusters (OCs). Cluster membership may be exploited to establish the ...

    • Kinematics of the central regions of NGC 1672 

      Díaz, Rubén Joaquín; Carranza, Gustavo Jose; Dottori, Horacio Alberto; Goldes, G. (1999) [Artículo de periódico]
      We present the detailed velocity field of the central 2 kpc of the LINER galaxy NGC 1672. The iso- velocity map shows a rotational pattern with a velocity gradient of 50 km s-ˡ arcsec-ˡ in the inner 6" (1"≈ 70 pc), indicating ...

    • Mortality and dust expulsion in early phases of stellar clusters : evidence from NIR photometry of nearby, spiral galaxies 

      Grosbol, Preben; Dottori, Horacio Alberto (2013) [Artículo de periódico]
      Context. It is often argued that young stellar clusters suffer a significant infant mortality that is partly related to the expulsion of dust and gas in their early phases caused by radiation pressure from hot stars and ...

    • NGC 1912 and NGC 1907 : a close encounter between open clusters? 

      Oliveira, Marcio Ramos de; Fausti Neto, Angelo; Bica, Eduardo Luiz Damiani; Dottori, Horacio Alberto (2002) [Artículo de periódico]
      The possible physical relation between the closely projected open clusters NGC 1912 (M 38) and NGC 1907 is investigated. Previous studies suggested a physical pair based on similar distances, and the present study explores ...

    • NGC 2180 : a disrupting open cluster? 

      Bonatto, Charles Jose; Bica, Eduardo Luiz Damiani; Pavani, Daniela Borges (2004) [Artículo 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 ...

    • Powerful winds in high-redshift obscured and red quasars 

      Vayner, Andrey; Zakamska, Nadia L.; Riffel, Rogemar André; Alexandroff, Rachael; Cosens, Maren; Hamann, Fred; Perrotta, Serena; Rupke, David S.N.; Storchi-Bergmann, Thaisa; Veilleux, Sylvain; Walth, Gregory L.; Wright, Shelley A.; Wylezalek, Dominika (2021) [Artículo de periódico]
      Quasar-driven outflows must have made their most significant impact on galaxy formation during the epoch when massive galaxies were forming most rapidly. To study the impact of quasar feedback, we conducted rest-frame ...

    • 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) [Artículo 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 clusters or asterisms? 2MASS CMD and structural analyses of 15 challenging targets 

      Bica, Eduardo Luiz Damiani; Bonatto, Charles Jose (2011) [Artículo de periódico]
      Context. Poorly-populated star clusters may have photometric and structural properties not much different from asterisms, to the point that, in some cases, widely-used databases present conflicting classifications. Aims. ...

    • 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) [Artículo 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 ...

    • Stellar rotations and the disentanglement of the galactic thin and thick discs 

      Silva, Moisés P. da; Alves-Brito, Alan; Nascimento Júnior, José Dias do (2024) [Artículo de periódico]
      The kinematics, mean α-elements, and ages of the stars reveal two distinct disc populations observed in the Solar neighbourhood. Although several studies have been carried out to characterize abundances of chemical elements ...

    • The benchmark black hole in NGC 4258 : dynamical models from high-resolution two-dimensional stellar kinematics 

      Drehmer, Daniel Alf; Storchi-Bergmann, Thaisa; Ferrari, Fabricio; Cappellari, Michele; Riffel, Rogemar André (2015) [Artículo de periódico]
      NGC 4258 is the galaxy with the most accurate (maser-based) determination for the mass of the supermassive black hole (SMBH) in its nucleus. In this work, we present a two-dimensional mapping of the stellar kinematics in ...

    • The black hole mass of NGC 4151. II. Stellar dynamical measurement from near-infrared field spectroscopy 

      Onken, Christopher Alan; Valluri, Monica; Brown, Jonathan S.; McGregor, Peter J.; Peterson, Bradley M.; Bentz, Misty Cherie; Ferrarese, Laura; Pogge, Richard William; Vestergaard, Marianne; Storchi-Bergmann, Thaisa; Riffel, Rogemar André (2014) [Artículo de periódico]
      We present a revised measurement of themass of the central black hole (MBH ) in the Seyfert 1 galaxyNGC4151. The new stellar dynamical mass measurement is derived by applying an axisymmetric orbit-superposition code to ...

    • The extended Planetary Nebula Spectrograph (ePN.S) early-type galaxy survey : The kinematic diversity of stellar halos and the relation between halo transition scale and stellar mass 

      Pulsoni, Claudia; Gerhard, Ortwin; Arnaboldi, Magda; Coccato, Lodovico; Longobardi, Alessia; Napolitano, Nicola R.; Moylan, Emily K. M.; Narayan, Chaitra A.; Gupta, V.; Burkert, Andreas; Capaccioli, M.; Chies-Santos, Ana Leonor; Cortesi, Arianna; Freeman, Kenneth C.; Kuijken, Koenraad H.; Merrifield, Michael; Romanowsky, Aaron J.; Tortora, Crescenzo (2018) [Artículo de periódico]
      Context. In the hierarchical two-phase formation scenario, the halos of early type galaxies (ETGs) are expected to have different physical properties from the galaxies’ central regions. Aims. The ePN.S survey characterizes ...

    • The structure of gould's belt 

      Strauss, Federico Maximo; Poeppel, W.G.L.; Vieira, Edemundo da Rocha (1979) [Artículo de periódico]
      A comparative study of optical and radio-astronomical data was made of a section of Gould's Belt from l l = 300°–12°. Two strong neutral hydrogen concentrations are associated with Sco OB2 and with the Lupus section of the ...