Navegação Ciências Exatas e da Terra por Assunto "Formacao de galaxias"

Resultados 1-20 de 28

    • Chemical abundances in Seyfert galaxies : X. sulphur abundance estimates 

      Dors Júnior, Oli Luiz; Valerdi, Mabel; Riffel, Rogemar André; Riffel, Rogério; Cardaci, Mónica V.; Hägelle, Guillermo Federico; Armah, Mark; Revalski, Mitchell; Flury, Sophia; Freitas-Lemes, Priscila; Amôres, Eduardo Brescansin de; Krabbe, Angela Cristina; Binette, Luc; Feltre, Anna; Storchi-Bergmann, Thaisa (2023) [Artigo de periódico]
      For the first time, the sulphur abundance relative to hydrogen (S/H) in the narrow-line regions of a sample of Seyfert 2 nuclei (Sy 2s) has been derived via direct estimation of the electron temperature. Narrow emission-line ...

    • 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 ...

    • DES J0454−4448 : discovery of the first luminous z ≥ 6 quasar from the Dark Energy Survey 

      Reed, Sophie L.; McMahon, Richard G.; Banerji, M.; Becker, George D.; Gonzalez-Solares, Eduardo; Martini, Paul; Ostrovski, F.; Rauch, Michael; Abbott, Timothy M. C.; Abdalla, Filipe B.; Allam, Sahar S.; Benoit-Lévy, Aurélien; Bertin, Emmanuel; Buckley-Geer, Elizabeth; Burke, David Lyle; Costa, Luiz N. da; Carnero Rosell, Aurelio; D'Andrea, Christopher B.; DePoy, Darren L.; Desai, S.; Diehl, H. Thomas; Doel, Peter; Cunha, Carlos Eduardo; Estrada, Juan; Evrard, August E.; Fausti Neto, Angelo; Finley, David A.; Fosalba Vela, Pablo; Frieman, Joshua A.; Gruen, Daniel; Honscheid, K.; James, David J.; Kent, Stephen M.; Kuehn, Kyler; Kuropatkin, Nikolay P.; Lahav, Ofer; Maia, Marcio Antonio Geimba; Makler, Martín; Marshall, Jennifer L.; Merritt, K. Wyatt; Miquel, Ramon; Mohr, Joseph J.; Nord, Brian Dennis; Ogando, Ricardo L.C.; Plazas Malagón, Andrés Alejandro; Romer, Anita K.; Roodman, Aaron; Rykoff, Eli; Sako, Masao; Sanchez-Alvaro, Eusebio; Santiago, Basilio Xavier; Schubnell, Michael; Sevilla Noarbe, Ignacio; Smith, Robert Christopher; Soares-Santos, Marcelle; Suchyta, Eric; Swanson, Molly E. C.; Tarle, Gregory; Thomas, D.; Tucker, Douglas L.; Walker, Alistair; Wechsler, Risa H. (2015) [Artigo de periódico]
      We present the first results of a survey for high-redshift, z ≥ 6, quasars using izY multicolour photometric observations from the Dark Energy Survey (DES). Here we report the discovery and spectroscopic confirmation of ...

    • Detecting massive galaxies at high redshift using the Dark Energy Survey 

      Davies, L. J. M.; Maraston, Claudia; Thomas, D.; Capozzi, Diego; Wechsler, Risa H.; Busha, M. T.; Banerji, M.; Ostrovski, F.; Papovich, Casey; Santiago, Basilio Xavier; Nichol, Robert C.; Maia, Marcio Antonio Geimba; Costa, Luiz N. da (2013) [Artigo de periódico]
      The Dark Energy Survey (DES) will be unprecedented in its ability to probe exceptionally large cosmic volumes to relatively faint optical limits. Primarily designed for the study of comparatively low-redshift (z<2) galaxies ...

    • Estimating stellar birth radii and the time evolution of Milky Way’s ISM metallicity gradient 

      Minchev, Ivan; Anders, Friedrich; Recio-Blanco, Alejandra; Chiappini, C.C.M.; Laverny, Patrick de; Queiroz, Anna Bárbara de Andrade; Steinmetz, M.; Adibekyan, Vardan; Carrillo, Ismael; Cescutti, Gabriele; Guiglion, Guillaume; Hayden, Michael; Jong, Roelof S. de; Kordopatis, Georges; Majewski, Steven Raymond; Martig, Marie; Santiago, Basilio Xavier (2018) [Artigo de periódico]
      We present a semi-empirical, largelymodel-independent approach for estimatingGalactic birth radii, rbirth, for Milky Way disc stars. The technique relies on the justifiable assumption that a negative radial metallicity ...

    • 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, ...

    • Globular cluster systems of relic galaxies 

      Alamo-Martínez, Karla A.; Chies-Santos, Ana Leonor; Beasley, Michael; Freitas, Rodrigo Flores de; Furlanetto, Cristina; Trevisan, Marina; Müller, Allan Schnorr; Leaman, Ryan; Bonatto, Charles Jose (2021) [Artigo de periódico]
      We analyse the globular cluster (GC) systems of a sample of 15 massive, compact early-type galaxies (ETGs), 13 of which have already been identified as good relic galaxy candidates on the basis of their compact morphologies, ...

    • J-PLUS : two-dimensional analysis of the stellar population in NGC 5473 and NGC 5485 

      San Roman, Izaskun; Chies-Santos, Ana Leonor; Sodre Junior, Laerte (2019) [Artigo de periódico]
      Context. The spatial variations of stellar population properties within a galaxy are intimately related to their formation process. Therefore, spatially resolved studies of galaxies are essential to uncover their formation ...

    • Kinematics with Gaia DR2 : the force of a dwarf 

      Carrillo, Ismael; Minchev, Ivan; Steinmetz, M.; Monari, Giacomo; Laporte, Chervin F. P.; Anders, Friedrich; Queiroz, Anna Bárbara de Andrade; Chiappini, C.C.M.; Khalatyan, Arman V.; Martig, Marie; McMillan, Paul; Santiago, Basilio Xavier; Youakim, Kris (2019) [Artigo de periódico]
      We use Gaia DR2 astrometric and line-of-sight velocity information combined with two sets of distances obtained with a Bayesian inference method to study the 3D velocity distribution in the Milky Way disc. We search for ...

    • Optical and mid-infrared neon abundance determinations in star-forming regions 

      Dors Júnior, Oli Luiz; Hägelle, Guillermo Federico; Cardaci, Mónica V.; Pérez-Montero, Enrique; Krabbe, Angela Cristina; Vilchez, Jose M.; Sales, Dinalva Aires de; Riffel, Rogério; Riffel, Rogemar André (2013) [Artigo de periódico]
      We have used observational spectroscopic data of star-forming regions compiled from the literature and photoionization models to analyse the neon ionic abundances obtained using both optical and mid-infrared emission lines. ...

    • Oxygen abundances in the narrow line regions of Seyfert galaxies and the metallicity–luminosity relation 

      Armah, Mark; Riffel, Rogério; Dors Júnior, Oli Luiz; Oh, Kyuseok; Koss, Michael; Ricci, Claudio; Trakhtenbrot, Benny; Valerdi, Mabel; Riffel, Rogemar André; Krabbe, Angela Cristina (2023) [Artigo de periódico]
      We present oxygen abundances relative to hydrogen (O/H) in the narrow line regions (NLRs) gas phases of Seyferts 1 (Sy 1s) and Seyferts 2 (Sy 2s) active galactic nuclei (AGNs). We used fluxes of the optical narrow emission ...

    • Photoionization of very high excitation gas in circinus galaxy and other active galactic nuclei 

      Binette, Luc; Wilson, Andrew S.; Raga, Alex; Storchi-Bergmann, Thaisa (1997) [Artigo de periódico]
      Recent measurements of the Circinus galaxy with ISO by Moorwood et al. (1996) have confirmed the extremely high excitation of the emission-line spectrum in this active galaxy. Moorwood et al. modelled the spectrum in terms ...

    • Relic galaxy analogues in TNG50 simulation : the formation pathways of surviving red nuggets in a cosmological simulation 

      Freitas, Rodrigo Flores de; Chies-Santos, Ana Leonor; Furlanetto, Cristina; de Rossi, María Emilia; Ferreira, Leonardo de Albernaz; Zenocratti, Lucas; Alamo-Martínez, Karla A. (2022) [Artigo de periódico]
      Relic galaxies are massive compact quiescent galaxies that formed at high-redshift and remained almost unchanged since then. In this work, we search for analogues to relic galaxies in the TNG50 cosmological simulations to ...

    • Sc and neutron-capture abundances in Galactic low- and high-α field halo stars 

      Fishlock, Cherie K.; Yong, David; Karakas, Amanda I.; Alves-Brito, Alan; Meléndez, Jorge; Nissen, Poul Erik; Kobayashi, Chiaki; Casey, Andrew Raithby (2017) [Artigo de periódico]
      We determine relative abundance ratios for the neutron-capture elements Zr, La, Ce, Nd and Eu for a sample of 27 Galactic dwarf stars with −1.5 < [Fe/H] < −0.8. We also measure the iron-peak element Sc. These stars separate ...

    • SDSS-IV MaNGA : environmental dependence of stellar age and metallicity gradients in nearby galaxies 

      Zheng, Zheng; Wang, Huiyuan; Ge, Junqiang; Mao, Shude; Li, Cheng; Li, Ran; Mo, Houjun; Goddard, Daniel; Bundy, Kevin; Li, Hongyu; Nair, Preethi B.; Lin, Lihwai; Long, Richard J.; Riffel, Rogério; Thomas, D.; Masters, K.L.; Bizyaev, D.; Brownstein, Joel R.; Zhang, Kai; Law, David R.; Drory, Niv; Lopes, Alexandre Roman; Malanushenko, E. (2017) [Artigo de periódico]
      We present a study on the stellar age and metallicity distributions for 1105 galaxies using the STARLIGHT software on MaNGA (Mapping Nearby Galaxies at APO) integral field spectra.We derive age and metallicity gradients ...

    • 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 : properties of galaxies with kinematically decoupled stellar and gaseous components 

      Jin, Yifei; Chen, Yanmei; Shi, Yong; Tremonti, Christy A.; Bershady, Matthew A.; Merrifield, Michael; Emsellem, Eric; Fu, Hai; Wake, D.A.; Bundy, Kevin; Lin, Lihwai; Argudo-Fernández, Maria; Huang, Song; Stark, David V.; Storchi-Bergmann, Thaisa; Bizyaev, D.; Brownstein, Joel R.; Chisholm, John P.; Guo, Qi; Hao, Lei; Hu, Jian; Li, Cheng; Li, Ran; Masters, K.L.; Malanushenko, E.; Pan, K.; Riffel, Rogemar André; Roman-Lopes, Alexandre; Simmons, Audrey E.; Thomas, D.; Wang, Lan; Westfall, Kyle B.; Yan, Renbin (2016) [Artigo de periódico]
      We study the properties of 66 galaxies with kinematically misaligned gas and stars from MaNGA survey. The fraction of kinematically misaligned galaxies varies with galaxy physical parameters, i.e. M∗, SFR and sSFR. According ...

    • SDSS-IV MaNGA : spatially resolved star formation histories in galaxies as a function of galaxy mass and type 

      Goddard, Daniel; Thomas, D.; Maraston, Claudia; Westfall, Kyle B.; Etherington, James; Riffel, Rogério; Mallmann, Nícolas Dullius; Zheng, Zheng; Argudo-Fernández, Maria; Lian, Jianhui; Bershady, Matthew A.; Bundy, Kevin; Drory, Niv; Law, David R.; Yan, Renbin; Wake, D.A.; Weijmans, Anne Marie; Bizyaev, D.; Brownstein, Joel R.; Lane, Richard R.; Maiolino, Roberto; Masters, K.L.; Merrifield, Michael; Nitschelm, Christian; Pan, K.; Roman-Lopes, Alexandre; Storchi-Bergmann, Thaisa; Schneider, D.P. (2017) [Artigo de periódico]
      We study the internal gradients of stellar population propertieswithin 1.5 Re for a representative sample of 721 galaxies, with stellar masses ranging between 109M and 1011.5M from the SDSS-IV MaNGA Integral-Field-Unit ...

    • SDSS-IV MaNGA : star formation cessation in low-redshift galaxies. I. Dependence on stellar mass and structural properties 

      Wang, Enci; Li, Cheng; Xiao, Ting; Lin, L.; Bershady, Matthew A.; Law, David R.; Merrifield, Michael; Sánchez, Sebastián F.; Riffel, Rogemar André; Riffel, Rogério; Yan, Renbin (2018) [Artigo de periódico]
      We investigate radial gradients in the recent star formation history (SFH) of 1917 galaxies with 0.01 < z < 0.14 from the Mapping Nearby Galaxies at Apache Point Observatory project. For each galaxy, we obtain twodimensional ...

    • SDSS-IV MaNGA : the impact of diffuse ionized gas on emission-line ratios, interpretation of diagnostic diagrams and gas metallicity measurements 

      Zhang, Kai; Yan, Renbin; Bundy, Kevin; Bershady, Matthew A.; Haffner, L. Matthew; Walterbos, Rene A. M.; Maiolino, Roberto; Tremonti, Christy A.; Thomas, D.; Drory, Niv; Jones, Amy P.; Belfiore, Francesco; Sánchez, Sebastián F.; Diamond-Stanic, Aleksandar M.; Bizyaev, D.; Nitschelm, Christian; Andrews, Brett H.; Brinkmann, Jon; Brownstein, Joel R.; Cheung, Edmond; Li, Cheng; Law, David R.; Roman-Lopes, Alexandre; Oravetz, Daniel J.; Pan, K.; Storchi-Bergmann, Thaisa; Simmons, Audrey E. (2017) [Artigo de periódico]
      Diffuse ionized gas (DIG) is prevalent in star-forming galaxies. Using a sample of 365 nearly face-on star-forming galaxies observed byMapping Nearby Galaxies at APO, we demonstrate how DIG in star-forming galaxies impacts ...