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23 results on '"Mapeamentos astronômicos"'

1. Upper boundaries of active galactic nucleus regions in optical diagnostic diagrams

Author

Niv Drory, Kai Zhang, Rogério Riffel, Renbin Yan, and Xihan Ji

Subjects
Electron density, Seyfert [Galaxies], Active galactic nucleus, active [Galaxies], Metallicity, Doubly ionized oxygen, Photoionization, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astronomy & Astrophysics, 01 natural sciences, 0103 physical sciences, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Line (formation), Physics, Mapeamentos astronômicos, 010308 nuclear & particles physics, Diagram, Astronomy and Astrophysics, Galaxy, Galáxias ativas, Space and Planetary Science, nuclei [Galaxies], Nucleo galatico, Astronomical and Space Sciences
Abstract

The distribution of galaxies in optical diagnostic diagrams can provide information about their physical parameters when compared with ionization models under proper assumptions. By using a sample of central emitting regions from the Mapping Nearby Galaxies at Apache Point Observatory survey (MaNGA), we find evidence of the existence of upper boundaries for narrow-line regions (NLRs) of active galactic nuclei (AGNs) in optical Baldwin, Phillips & Terlevich (BPT) diagrams, especially in diagrams involving [S ii]λλ6716, 6731/Hα. Photoionization models can reproduce the boundaries well, as a consequence of the decrease of [S ii]λλ6716, 6731/Hα and [O iii]λ5007/Hβ ratios at very high metallicity. Whilst the exact location of the upper boundary in the [S ii] BPT diagram depends only weakly on the electron density of the ionized cloud and the secondary nitrogen prescription, its dependence on the shapes of the input spectral energy distributions (SEDs) is much stronger. This allows us to constrain the power-law index of the AGN SED between 1 Ryd and ∼100 Ryd to be less than or equal to −1.40 ± 0.05. The coverage of photoionization models in the [N ii] BPT diagram has a stronger dependence on the electron density and the secondary nitrogen prescription. With the density constrained by the [S ii] doublet ratio and the input SED constrained by the [S ii] BPT diagram, we find that the extent of the data in the [N ii] BPT diagram favours those prescriptions with high N/O ratios. Although shock-ionized clouds can produce line ratios similar to those from photoionization, the resulting shapes of the upper boundaries, if they exist, would likely be different from those of photoionizing origin.

Published
2020

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

Author

Michael R. Merrifield, Rogemar A. Riffel, Matthew A. Bershady, Lin Lin, Rogério Riffel, Enci Wang, Cheng Li, Ting Xiao, David R. Law, Sebastián F. Sánchez, and Renbin Yan

Subjects
Stellar mass, galaxies: evolution – galaxies: formation – galaxies: general – galaxies: stellar content – methods:observational – surveys, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Surveys, 01 natural sciences, Luminosity, Formacao de galaxias, 0103 physical sciences, Evolucao galatica, Galaxy formation and evolution, Astrophysics::Solar and Stellar Astrophysics, observational [Methods], Emission spectrum, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, Mapeamentos astronômicos, 010308 nuclear & particles physics, Star formation, Astronomy and Astrophysics, general [Galaxies], evolution [Galaxies], Astrophysics - Astrophysics of Galaxies, formation [Galaxies], Redshift, Galaxy, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), stellar content [Galaxies], Astrophysics::Earth and Planetary Astrophysics, Equivalent width
Abstract

We investigate radial gradients in the recent star formation history (SFH) using 1917 galaxies with $0.01, Comment: 23 pages, 20 figures, Accept to ApJ

Published
2018

3. Dusty spirals versus gas kinematics in the inner kiloparsec of Four Low-Luminosity Active Galactic Nuclei

Author

Rogemar A. Riffel, Allan Schnorr Müller, Carine Brum, Thaisa Storchi-Bergmann, Davide Lena, and Andrew Robinson

Subjects
individual (NGC 4501) [Galaxies], Seyfert [Galaxies], Active galactic nucleus, Astronomy, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Gas ionizado, Disc galaxy, Lambda, 01 natural sciences, Hubble sequence, symbols.namesake, 0103 physical sciences, Cinemática, Disc, GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries), 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Mapeamentos astronômicos, Physics, Luminous infrared galaxy, kinematics and dynamics [Galaxies], 010308 nuclear & particles physics, individual (NGC 4450) [Galaxies], Astronomy and Astrophysics, Espectros estelares, Astrophysics - Astrophysics of Galaxies, Galaxias seyfert, Galaxy, individual (NGC 2787) [Galaxies], individual (NGC 3982) [Galaxies], Supernova, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), symbols, Nucleo galatico
Abstract

We used the Gemini Multi-Object Spectrograph Integral Field Unit to map the gas distribution, excitation and kinematics within the inner kiloparsec of four nearby low-luminosity active galaxies: NGC3982, NGC4501, NGC2787 and NGC4450. The observations cover the spectral range 5600-7000{\AA} at a velocity resolution of 120km/s and spatial resolution ranging from 50 to 70pc at the galaxies. Extended emission in H{\alpha}, [NII]{\lambda}{\lambda}6548,6583, [SII]{\lambda}{\lambda}6716,6730 over most of the field-of-view is observed for all galaxies, while only NGC3982 shows [OI]{\lambda}6300 extended emission. The H{\alpha} equivalent widths combined with the [NII]/H{\alpha} line ratios reveal that NGC3982 and NGC4450 harbor Seyfert nuclei surrounded by regions with LINER excitation, while NGC2787 and NGC4501 harbor LINER nuclei. NGC3982 shows a partial ring of recent star-formation at 500pc from the nucleus, while in NGC4501 a region at 500pc west of the nucleus shows LINER excitation but has been interpreted as an aging HII region with the gas excitation dominated by shocks from supernovae. The line-of-sight velocity field of the gas shows a rotation pattern for all galaxies, with deviations from pure disk rotation observed in NGC3982, NGC4501 and NGC4450. For NGC4501 and NGC4450, many of these deviations are spatially coincident with dust structures seen in optical continuum images, leading to the interpretation that the deviations are due to shocks in the gas traced by the dust. A speculation is that these shocks lead to loss of angular momentum, allowing the gas to be transferred inwards to feed the AGN. In the case of NGC2787, instead of deviations in the rotation field, we see a misalignment of 40{^\circ} between the orientation of the line of nodes of the gas rotation and the photometric major axis of the galaxy. Evidence of compact nuclear outflows are seen in NGC4501 and NGC4450., Comment: 20 pages, accepted for publication in MNRAS

Published
2017

4. Sloan Digital Sky Survey IV: Mapping the Milky Way, Nearby Galaxies, and the Distant Universe

Author

Michael R. Blanton, Matthew A. Bershady, Bela Abolfathi, Franco D. Albareti, Carlos Allende Prieto, Andres Almeida, Javier Alonso-García, Friedrich Anders, Scott F. Anderson, Brett Andrews, Erik Aquino-Ortíz, Alfonso Aragón-Salamanca, Maria Argudo-Fernández, Eric Armengaud, Eric Aubourg, Vladimir Avila-Reese, Carles Badenes, Stephen Bailey, Kathleen A. Barger, Jorge Barrera-Ballesteros, Curtis Bartosz, Dominic Bates, Falk Baumgarten, Julian Bautista, Rachael Beaton, Timothy C. Beers, Francesco Belfiore, Chad F. Bender, Andreas A. Berlind, Mariangela Bernardi, Florian Beutler, Jonathan C. Bird, Dmitry Bizyaev, Guillermo A. Blanc, Michael Blomqvist, Adam S. Bolton, Médéric Boquien, Jura Borissova, Remco van den Bosch, Jo Bovy, William N. Brandt, Jonathan Brinkmann, Joel R. Brownstein, Kevin Bundy, Adam J. Burgasser, Etienne Burtin, Nicolás G. Busca, Michele Cappellari, Maria Leticia Delgado Carigi, Joleen K. Carlberg, Aurelio Carnero Rosell, Ricardo Carrera, Nancy J. Chanover, Brian Cherinka, Edmond Cheung, Yilen Gómez Maqueo Chew, Cristina Chiappini, Peter Doohyun Choi, Drew Chojnowski, Chia-Hsun Chuang, Haeun Chung, Rafael Fernando Cirolini, Nicolas Clerc, Roger E. Cohen, Johan Comparat, Luiz da Costa, Marie-Claude Cousinou, Kevin Covey, Jeffrey D. Crane, Rupert A. C. Croft, Irene Cruz-Gonzalez, Daniel Garrido Cuadra, Katia Cunha, Guillermo J. Damke, Jeremy Darling, Roger Davies, Kyle Dawson, Axel de la Macorra, Flavia Dell’Agli, Nathan De Lee, Timothée Delubac, Francesco Di Mille, Aleks Diamond-Stanic, Mariana Cano-Díaz, John Donor, Juan José Downes, Niv Drory, Hélion du Mas des Bourboux, Christopher J. Duckworth, Tom Dwelly, Jamie Dyer, Garrett Ebelke, Arthur D. Eigenbrot, Daniel J. Eisenstein, Eric Emsellem, Mike Eracleous, Stephanie Escoffier, Michael L. Evans, Xiaohui Fan, Emma Fernández-Alvar, J. G. Fernandez-Trincado, Diane K. Feuillet, Alexis Finoguenov, Scott W. Fleming, Andreu Font-Ribera, Alexander Fredrickson, Gordon Freischlad, Peter M. Frinchaboy, Carla E. Fuentes, Lluís Galbany, R. Garcia-Dias, D. A. García-Hernández, Patrick Gaulme, Doug Geisler, Joseph D. Gelfand, Héctor Gil-Marín, Bruce A. Gillespie, Daniel Goddard, Violeta Gonzalez-Perez, Kathleen Grabowski, Paul J. Green, Catherine J. Grier, James E. Gunn, Hong Guo, Julien Guy, Alex Hagen, ChangHoon Hahn, Matthew Hall, Paul Harding, Sten Hasselquist, Suzanne L. Hawley, Fred Hearty, Jonay I. Gonzalez Hernández, Shirley Ho, David W. Hogg, Kelly Holley-Bockelmann, Jon A. Holtzman, Parker H. Holzer, Joseph Huehnerhoff, Timothy A. Hutchinson, Ho Seong Hwang, Héctor J. Ibarra-Medel, Gabriele da Silva Ilha, Inese I. Ivans, KeShawn Ivory, Kelly Jackson, Trey W. Jensen, Jennifer A. Johnson, Amy Jones, Henrik Jönsson, Eric Jullo, Vikrant Kamble, Karen Kinemuchi, David Kirkby, Francisco-Shu Kitaura, Mark Klaene, Gillian R. Knapp, Jean-Paul Kneib, Juna A. Kollmeier, Ivan Lacerna, Richard R. Lane, Dustin Lang, David R. Law, Daniel Lazarz, Youngbae Lee, Jean-Marc Le Goff, Fu-Heng Liang, Cheng Li, Hongyu Li, Jianhui Lian, Marcos Lima, Lihwai Lin, Yen-Ting Lin, Sara Bertran de Lis, Chao Liu, Miguel Angel C. de Icaza Lizaola, Dan Long, Sara Lucatello, Britt Lundgren, Nicholas K. MacDonald, Alice Deconto Machado, Chelsea L. MacLeod, Suvrath Mahadevan, Marcio Antonio Geimba Maia, Roberto Maiolino, Steven R. Majewski, Elena Malanushenko, Viktor Malanushenko, Arturo Manchado, Shude Mao, Claudia Maraston, Rui Marques-Chaves, Thomas Masseron, Karen L. Masters, Cameron K. McBride, Richard M. McDermid, Brianne McGrath, Ian D. McGreer, Nicolás Medina Peña, Matthew Melendez, Andrea Merloni, Michael R. Merrifield, Szabolcs Meszaros, Andres Meza, Ivan Minchev, Dante Minniti, Takamitsu Miyaji, Surhud More, John Mulchaey, Francisco Müller-Sánchez, Demitri Muna, Ricardo R. Munoz, Adam D. Myers, Preethi Nair, Kirpal Nandra, Janaina Correa do Nascimento, Alenka Negrete, Melissa Ness, Jeffrey A. Newman, Robert C. Nichol, David L. Nidever, Christian Nitschelm, Pierros Ntelis, Julia E. O’Connell, Ryan J. Oelkers, Audrey Oravetz, Daniel Oravetz, Zach Pace, Nelson Padilla, Nathalie Palanque-Delabrouille, Pedro Alonso Palicio, Kaike Pan, John K. Parejko, Taniya Parikh, Isabelle Pâris, Changbom Park, Alim Y. Patten, Sebastien Peirani, Marcos Pellejero-Ibanez, Samantha Penny, Will J. Percival, Ismael Perez-Fournon, Patrick Petitjean, Matthew M. Pieri, Marc Pinsonneault, Alice Pisani, Radosław Poleski, Francisco Prada, Abhishek Prakash, Anna Bárbara de Andrade Queiroz, M. Jordan Raddick, Anand Raichoor, Sandro Barboza Rembold, Hannah Richstein, Rogemar A. Riffel, Rogério Riffel, Hans-Walter Rix, Annie C. Robin, Constance M. Rockosi, Sergio Rodríguez-Torres, A. Roman-Lopes, Carlos Román-Zúñiga, Margarita Rosado, Ashley J. Ross, Graziano Rossi, John Ruan, Rossana Ruggeri, Eli S. Rykoff, Salvador Salazar-Albornoz, Mara Salvato, Ariel G. Sánchez, D. S. Aguado, José R. Sánchez-Gallego, Felipe A. Santana, Basílio Xavier Santiago, Conor Sayres, Ricardo P. Schiavon, Jaderson da Silva Schimoia, Edward F. Schlafly, David J. Schlegel, Donald P. Schneider, Mathias Schultheis, William J. Schuster, Axel Schwope, Hee-Jong Seo, Zhengyi Shao, Shiyin Shen, Matthew Shetrone, Michael Shull, Joshua D. Simon, Danielle Skinner, M. F. Skrutskie, Anže Slosar, Verne V. Smith, Jennifer S. Sobeck, Flavia Sobreira, Garrett Somers, Diogo Souto, David V. Stark, Keivan Stassun, Fritz Stauffer, Matthias Steinmetz, Thaisa Storchi-Bergmann, Alina Streblyanska, Guy S. Stringfellow, Genaro Suárez, Jing Sun, Nao Suzuki, Laszlo Szigeti, Manuchehr Taghizadeh-Popp, Baitian Tang, Charling Tao, Jamie Tayar, Mita Tembe, Johanna Teske, Aniruddha R. Thakar, Daniel Thomas, Benjamin A. Thompson, Jeremy L. Tinker, Patricia Tissera, Rita Tojeiro, Hector Hernandez Toledo, Sylvain de la Torre, Christy Tremonti, Nicholas W. Troup, Octavio Valenzuela, Inma Martinez Valpuesta, Jaime Vargas-González, Mariana Vargas-Magaña, Jose Alberto Vazquez, Sandro Villanova, M. Vivek, Nicole Vogt, David Wake, Rene Walterbos, Yuting Wang, Benjamin Alan Weaver, Anne-Marie Weijmans, David H. Weinberg, Kyle B. Westfall, David G. Whelan, Vivienne Wild, John Wilson, W. M. Wood-Vasey, Dominika Wylezalek, Ting Xiao, Renbin Yan, Meng Yang, Jason E. Ybarra, Christophe Yèche, Nadia Zakamska, Olga Zamora, Pauline Zarrouk, Gail Zasowski, Kai Zhang, Gong-Bo Zhao, Zheng Zheng, Xu Zhou, Zhi-Min Zhou, Guangtun B. Zhu, Manuela Zoccali, Hu Zou, The Leverhulme Trust, University of St Andrews. School of Physics and Astronomy, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, APC - Cosmologie, AstroParticule et Cosmologie (APC (UMR_7164)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre de Recherche Astrophysique de Lyon (CRAL), École normale supérieure de Lyon (ENS de Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Joseph Louis LAGRANGE (LAGRANGE), Université Nice Sophia Antipolis (1965 - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur, COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Institut d'Astrophysique de Paris (IAP), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Aix Marseille Université (AMU)-Centre National d'Études Spatiales [Toulouse] (CNES), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Pierre et Marie Curie - Paris 6 (UPMC), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC), Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU), Université Nice Sophia Antipolis (... - 2019) (UNS), Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Observatoire de la Côte d'Azur, Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS), Université Côte d'Azur (UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Centre National de la Recherche Scientifique (CNRS), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-École normale supérieure - Lyon (ENS Lyon)

Subjects
Astrophysics and Astronomy, Milky Way, astro-ph.GA, FOS: Physical sciences, Espectros astronômicos, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Surveys, 01 natural sciences, law.invention, Telescope, Redshift-space distortions, surveys, Observatory, law, 0103 physical sciences, QB Astronomy, Astrophysics::Solar and Stellar Astrophysics, spectrographs [Instrumentation], observations [Cosmology], Galaxy: general, stars: general, 010303 astronomy & astrophysics, general [Galaxy], QC, Astrophysics::Galaxy Astrophysics, instrumentation: spectrographs, QB, Mapeamentos astronômicos, Physics, general [Stars], 010308 nuclear & particles physics, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy and Astrophysics, Quasar, general [Galaxies], DAS, galaxies: general, Astrophysics - Astrophysics of Galaxies, Galaxy, Redshift, QC Physics, Space and Planetary Science, cosmology: observations, Astrophysics of Galaxies (astro-ph.GA), Catalogos astronomicos, Baryon acoustic oscillations, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

We describe the Sloan Digital Sky Survey IV (SDSS-IV), a project encompassing three major spectroscopic programs. The Apache Point Observatory Galactic Evolution Experiment 2 (APOGEE-2) is observing hundreds of thousands of Milky Way stars at high resolution and high signal-to-noise ratio in the near-infrared. The Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey is obtaining spatially-resolved spectroscopy for thousands of nearby galaxies (median redshift of z = 0.03). The extended Baryon Oscillation Spectroscopic Survey (eBOSS) is mapping the galaxy, quasar, and neutral gas distributions between redshifts z = 0.6 and 3.5 to constrain cosmology using baryon acoustic oscillations, redshift space distortions, and the shape of the power spectrum. Within eBOSS, we are conducting two major subprograms: the SPectroscopic IDentification of eROSITA Sources (SPIDERS), investigating X-ray AGN and galaxies in X-ray clusters, and the Time Domain Spectroscopic Survey (TDSS), obtaining spectra of variable sources. All programs use the 2.5-meter Sloan Foundation Telescope at Apache Point Observatory; observations there began in Summer 2014. APOGEE-2 also operates a second near-infrared spectrograph at the 2.5-meter du Pont Telescope at Las Campanas Observatory, with observations beginning in early 2017. Observations at both facilities are scheduled to continue through 2020. In keeping with previous SDSS policy, SDSS-IV provides regularly scheduled public data releases; the first one, Data Release 13, was made available in July 2016., Published in Astronomical Journal

Published
2017

5. OMEGA - OSIRIS Mapping of Emission-line Galaxies in A901/2: III. - Galaxy Properties Across Projected Phase Space in A901/2

Author

Meghan E. Gray, Bruno Rodríguez del Pino, Alfonso Aragón-Salamanca, R. Cool, Ana L. Chies-Santos, Asmus Böhm, Tim Weinzirl, Steven P. Bamford, and Christian Wolf

Subjects
FOS: Physical sciences, clusters: individual: A901/2 [Galaxies], Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Metalicidade, Galaxy merger, star formation [Galaxies], 01 natural sciences, Peculiar galaxy, Galaxy group, 0103 physical sciences, distances and redshifts [Galaxies], Astrophysics::Solar and Stellar Astrophysics, Deslocamento para o vermelho, Brightest cluster galaxy, 010303 astronomy & astrophysics, Lenticular galaxy, Galaxy cluster, Astrophysics::Galaxy Astrophysics, Mapeamentos astronômicos, Luminous infrared galaxy, Physics, 010308 nuclear & particles physics, Astronomy, interferometers [Instrumentation], Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Elliptical galaxy, Astrophysics::Earth and Planetary Astrophysics, Nucleo galatico
Abstract

We conduct a comprehensive projected phase-space analysis of the A901/2 multi-cluster system at $z\sim0.165$. Aggregating redshifts from spectroscopy, tunable-filter imaging, and prism techniques, we assemble a sample of 856 cluster galaxies reaching $10^{8.5}M_\odot$ in stellar mass. We look for variations in cluster galaxy properties between virialised and non-virialised regions of projected phase-space (PPS). Our main conclusions point to relatively gentle environmental effects, expressed mainly on galaxy gas reservoirs. (1) Stacking the four subclusters in A901/2, we find galaxies in the virialised region are more massive, redder, and have marginally higher S��rsic indices, but their half-light radii and Hubble types are not significantly different. (2) After accounting for trends in stellar mass, there is a remaining change in rest-frame colour across PPS. Primarily, the colour difference is due to an absence in the virialised region of galaxies with rest-frame $B-V10^{9.85}M_\odot$) stellar mass. (3) There is an infalling population of lower-mass ($M_\star\leq10^{9.85}M_\odot$), relatively blue ($B-V, Accepted for publication in MNRAS

Published
2017
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6. SDSS-IV MaNGA:Environmental dependence of stellar age and metallicity gradients in nearby galaxies

Author

Zheng Zheng, Niv Drory, Kevin Bundy, R. J. Long, David R. Law, Cheng Li, Lihwai Lin, Ran Li, Daniel Thomas, Huiyuan Wang, Joel R. Brownstein, Kai Zhang, Karen L. Masters, Rogério Riffel, Junqiang Ge, Daniel Goddard, P. Nair, Hongyu Li, Shude Mao, Houjun Mo, Alexandre Roman Lopes, Olena Malanushenko, and Dmitry Bizyaev

Subjects
Cosmology and Gravitation, Galaxies formation, astro-ph.GA, Surface brightness fluctuation, Metallicity, structure [Galaxies], FOS: Physical sciences, abundances [Galaxies], Astrophysics, Galaxies abundances, Astrophysics::Cosmology and Extragalactic Astrophysics, Metalicidade, 01 natural sciences, Peculiar galaxy, Formacao de galaxias, Populacoes estelares, statistics [Galaxies], Galaxy group, Galaxies statistics, 0103 physical sciences, Evolucao estelar, Disc, 010303 astronomy & astrophysics, Lenticular galaxy, Galaxy cluster, Astrophysics::Galaxy Astrophysics, Physics, Mapeamentos astronômicos, 010308 nuclear & particles physics, Galaxies structure, Astronomy, Galaxies stellar content, Astronomy and Astrophysics, evolution [Galaxies], Astrophysics - Astrophysics of Galaxies, formation [Galaxies], Galaxies evolution, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Elliptical galaxy, stellar content [Galaxies]
Abstract

We present a study on the stellar age and metallicity distributions for 1105 galaxies using the STARLIGHT software on MaNGA integral field spectra. We derive age and metallicity gradients by fitting straight lines to the radial profiles, and explore their correlations with total stellar mass M*, NUV-r colour and environments, as identified by both the large scale structure (LSS) type and the local density. We find that the mean age and metallicity gradients are close to zero but slightly negative, which is consistent with the inside-out formation scenario. Within our sample, we find that both the age and metallicity gradients show weak or no correlation with either the LSS type or local density environment. In addition, we also study the environmental dependence of age and metallicity values at the effective radii. The age and metallicity values are highly correlated with M* and NUV-r and are also dependent on LSS type as well as local density. Low-mass galaxies tend to be younger and have lower metallicity in low-density environments while high-mass galaxies are less affected by environment., 18 pages, 24 figures, accepted for publication in MNRAS

Published
2017

7. A stellar overdensity associated with the Small Magellanic Cloud

Author

G. Gutierrez, Nicolas F. Martin, A. Benoit-Lévy, B. Flaugher, E. Luque, K. Honscheid, Nikolay Kuropatkin, Peter Doel, W. C. Wester, Noelia E. D. Noël, J. Carretero, H. T. Diehl, M. Carrasco Kind, G. Tarle, Jennifer L. Marshall, David J. James, Daniel Gruen, A. K. Romer, R. P. van der Marel, Guy S. Stringfellow, Felipe Menanteau, Ramon Miquel, T. M. C. Abbott, Gurtina Besla, M. Sako, A. Fausti Neto, Pablo Fosalba, J. Gschwend, E. J. Sanchez, C. B. D'Andrea, Douglas L. Tucker, S. Allam, Robert A. Gruendl, Kyler Kuehn, Flavia Sobreira, David Martinez-Delgado, Alex Drlica-Wagner, Keith Bechtol, Eduardo Balbinot, F. B. Abdalla, William G. Hartley, Tenglin Li, Ricardo L. C. Ogando, Carme Gallart, A. Carnero Rosell, Basilio X. Santiago, D. L. Nidever, Adriano Pieres, Carlos E. Cunha, J. Annis, M. E. C. Swanson, Shantanu Desai, R. C. Smith, Juan Garcia-Bellido, M. R. L. Cioni, E. Suchyta, A. A. Plazas, Vasily Belokurov, M. A. G. Maia, Michael Schubnell, I. Sevilla-Noarbe, L. N. da Costa, Blair C. Conn, K. A. G. Olsen, V. Scarpine, Alistair R. Walker, Marcelle Soares-Santos, S. R. Majewski, Observatoire astronomique de Strasbourg (ObAS), Université de Strasbourg (UNISTRA)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), DES, Observatoire astronomique de Strasbourg ( ObAS ), Université de Strasbourg ( UNISTRA ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS ), Institut d'Astrophysique de Paris ( IAP ), and Université Pierre et Marie Curie - Paris 6 ( UPMC ) -Institut national des sciences de l'Univers ( INSU - CNRS ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
Higher education, [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], FOS: Physical sciences, Library science, interactions [Galaxies], 01 natural sciences, 0103 physical sciences, Magellanic Clouds, galaxies: interactions, Formacao de estrelas, 010303 astronomy & astrophysics, QB, Mapeamentos astronômicos, Physics, 010308 nuclear & particles physics, business.industry, European research, Astronomy, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, 13. Climate action, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Fundamental physics, Christian ministry, Small Magellanic Cloud, business, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Pequena Nuvem de Magalhães
Abstract

We report the discovery of a stellar over-density 8$^{\circ}$ north of the center of the Small Magellanic Cloud (Small Magellanic Cloud Northern Over-Density; SMCNOD) using data from the first two years of the Dark Energy Survey (DES) and the first year of the MAGellanic SatelLITEs Survey (MagLiteS). The SMCNOD is indistinguishable in age, metallicity and distance from the nearby SMC stars, being primarly composed of intermediate-age stars (6 Gyr, Z=0.001), with a small fraction of young stars (1 Gyr, Z=0.01). The SMCNOD has an elongated shape with an ellipticity of 0.6 and a size of $\sim$ 6x2 deg. It has an absolute magnitude of $M_V \cong$ -7.7, $r_h = 2.1$ kpc, and $\mu_V(r, Comment: 14 pages, 10 color figures

Published
2017

8. SDSS-IV MaNGA: Spatially resolved star formation histories in galaxies as a function of galaxy mass and type

Author

Claudia Maraston, Maria Argudo-Fernández, Daniel Thomas, James Etherington, Michael R. Merrifield, Rogério Riffel, Rebecca Lane, Kyle B. Westfall, Kaike Pan, Zheng Zheng, David A. Wake, Dmitry Bizyaev, Jianhui Lian, Daniel Goddard, Matthew A. Bershady, David R. Law, Roberto Maiolino, Thaisa Storchi-Bergmann, Karen L. Masters, Nícolas Dullius Mallmann, Christian Nitschelm, Donald P. Schneider, Niv Drory, Kevin Bundy, Renbin Yan, Alexandre Roman-Lopes, Joel R. Brownstein, Anne-Marie Weijmans, Maiolino, Roberto [0000-0002-4985-3819], Apollo - University of Cambridge Repository, The Leverhulme Trust, and University of St Andrews. School of Physics and Astronomy

Subjects
Stellar population, Surface brightness fluctuation, Astrophysics, 01 natural sciences, Galaxy group, QB Astronomy, galaxies: elliptical and lenticular, 10. No inequality, 010303 astronomy & astrophysics, QC, QB, Physics, Mapeamentos astronômicos, Galaxias elipticas, elliptical and lenticular CD [Galaxies], Elliptical galaxy, Astrophysics::Earth and Planetary Astrophysics, star formation [galaxies], galaxies: evolution, galaxies: spiral, formation [galaxies], Metallicity, astro-ph.GA, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Galaxy merger, elliptical and lenticular, cD [Galaxies], Formacao de galaxias, cD, Populacoes estelares, 0103 physical sciences, galaxies: formation, Lenticular galaxy, Astrophysics::Galaxy Astrophysics, evolution [galaxies], STFC, Luminous infrared galaxy, spiral [Galaxies], 010308 nuclear & particles physics, Astronomy, RCUK, DAS, Astronomy and Astrophysics, stellar content [galaxies], Astrophysics - Astrophysics of Galaxies, QC Physics, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), galaxies: star formation, galaxies: stellar content, elliptical and lenticular [galaxies]
Abstract

We study the internal gradients of stellar population properties within $1.5\;R_{\rm e}$ for a representative sample of 721 galaxies with stellar masses ranging between $10^{9}\;M_{\odot}$ to $10^{11.5}\;M_{\odot}$ from the SDSS-IV MaNGA IFU survey. Through the use of our full spectral fitting code FIREFLY, we derive light and mass-weighted stellar population properties and their radial gradients, as well as full star formation and metal enrichment histories. We also quanfify the impact that different stellar population models and full spectral fitting routines have on the derived stellar population properties, and the radial gradient measurements. In our analysis, we find that age gradients tend to be shallow for both early-type and late-type galaxies. {\em Mass-weighted} age gradients of early-types are positive ($\sim 0.09\; {\rm dex}/R_{\rm e}$) pointing to "outside-in" progression of star formation, while late-type galaxies have negative {\em light-weighted} age gradients ($\sim -0.11\; {\rm dex}/R_{\rm e}$), suggesting an "inside-out" formation of discs. We detect negative metallicity gradients in both early and late-type galaxies, but these are significantly steeper in late-types, suggesting that radial dependence of chemical enrichment processes and the effect of gas inflow and metal transport are far more pronounced in discs. Metallicity gradients of both morphological classes correlate with galaxy mass, with negative metallicity gradients becoming steeper with increasing galaxy mass. The correlation with mass is stronger for late-type galaxies, with a slope of $d(\nabla [Z/H])/d(\log M)\sim -0.2\pm 0.05\;$, compared to $d(\nabla [Z/H])/d(\log M)\sim -0.05\pm 0.05\;$ for early-types. This result suggests that the merger history plays a relatively small role in shaping metallicity gradients of galaxies., 31 pages, 22 figures, 5 tables. Resubmitted to MNRAS including referees comments

Published
2017
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9. SDSS-IV MaNGA: stellar population gradients as a function of galaxy environment

Author

Alexandre Roman-Lopes, Claudia Maraston, Roberto Maiolino, Anne-Marie Weijmans, Kyle B. Westfall, Michael R. Merrifield, Kaike Pan, Daniel Thomas, David R. Law, Joel R. Brownstein, Zheng Zheng, J. Etherington, David A. Wake, Rogério Riffel, Maria Argudo-Fernández, Nícolas Dullius Mallmann, Christian Nitschelm, Matthew A. Bershady, Daniel Goddard, Niv Drory, Renbin Yan, Thaisa Storchi-Bergmann, Karen L. Masters, Dmitry Bizyaev, Kevin Bundy, Rebecca Lane, Apollo-University Of Cambridge Repository, Maiolino, Roberto [0000-0002-4985-3819], Apollo - University of Cambridge Repository, and University of St Andrews. School of Physics and Astronomy

Subjects
galaxies: spiral, Stellar population, Metallicity, astro-ph.GA, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Metalicidade, Surveys, elliptical and lenticular, cD [Galaxies], 01 natural sciences, cD, elliptical and lenticular [Galaxies], Populacoes estelares, surveys, 0103 physical sciences, Satellite galaxy, Galaxy formation and evolution, QB Astronomy, galaxies: formation, galaxies: elliptical and lenticular, Formacao de estrelas, 010303 astronomy & astrophysics, QC, STFC, Astrophysics::Galaxy Astrophysics, QB, Physics, Mapeamentos astronômicos, spiral [Galaxies], Spiral galaxy, 010308 nuclear & particles physics, Astronomy, RCUK, DAS, Astronomy and Astrophysics, Type-cD galaxy, Function (mathematics), evolution [Galaxies], formation [Galaxies], Astrophysics - Astrophysics of Galaxies, Galaxy, Galaxias seyfert, QC Physics, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), galaxies: stellar content, stellar content [Galaxies], galaxies: evolution
Abstract

We study the internal radial gradients of stellar population properties within $1.5\;R_{\rm e}$ and analyse the impact of galaxy environment. We use a representative sample of 721 galaxies with masses ranging between $10^{9}\;M_{\odot}$ to $10^{11.5}\;M_{\odot}$ from the SDSS-IV survey MaNGA. We split this sample by morphology into early-type and late-type galaxies. Using the full spectral fitting code FIREFLY, we derive the light and mass-weighted stellar population properties age and metallicity, and calculate the gradients of these properties. We use three independent methods to quantify galaxy environment, namely the $N^{th}$ nearest neighbour, the tidal strength parameter $Q$ and distinguish between central and satellite galaxies. In our analysis, we find that early-type galaxies generally exhibit shallow light-weighted age gradients in agreement with the literature and mass-weighted median age gradients tend to be slightly positive. Late-type galaxies, instead, have negative light-weighted age gradients. We detect negative metallicity gradients in both early and late-type galaxies that correlate with galaxy mass, with the gradients being steeper and the correlation with mass being stronger in late-types. We find, however, that stellar population gradients, for both morphological classifications, have no significant correlation with galaxy environment for all three characterisations of environment. Our results suggest that galaxy mass is the main driver of stellar population gradients in both early and late-type galaxies, and any environmental dependence, if present at all, must be very subtle., 14 pages, 8 figures, 4 tables. MNRAS in press

Published
2016

10. SDSS-IV MaNGA: Properties of galaxies with kinematically decoupled stellar and gaseous components

Author

Audrey Simmons, John Chisholm, Eric Emsellem, Dmitry Bizyaev, Michael R. Merrifield, Thaisa Storchi-Bergmann, Maria Argudo-Fernández, Karen L. Masters, Yanmei Chen, Elena Malanushenko, Hai Fu, Kaike Pan, Christy Tremonti, Song Huang, Joel R. Brownstein, David A. Wake, Lihwai Lin, Kevin Bundy, Yifei Jin, Lan Wang, Rogemar A. Riffel, Lei Hao, Jian Hu, Kyle B. Westfall, Qi Guo, Alexandre Roman-Lopes, Ran Li, David V. Stark, Daniel Thomas, Renbin Yan, Yong Shi, Cheng Li, and Matthew A. Bershady

Subjects
Angular momentum, Cosmology and Gravitation, Isolated environment, Metallicity, structure [Galaxies], astro-ph.GA, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Metalicidade, 01 natural sciences, Formacao de galaxias, Populacoes estelares, Cosmic web, 0103 physical sciences, Evolucao estelar, Galaxy formation and evolution, Cinemática, galaxies: formation, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Physics, Mapeamentos astronômicos, 010308 nuclear & particles physics, Star formation, Astronomy, abundances [Galaxy], Astronomy and Astrophysics, evolution [Galaxies], formation [Galaxies], Astrophysics - Astrophysics of Galaxies, Galaxy, Stars, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), galaxies: stellar content, Galaxy: abundances, galaxies: structure, stellar content [Galaxies], Astrophysics::Earth and Planetary Astrophysics, galaxies: evolution
Abstract

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 to their sSFR, we further classify these 66 galaxies into three categories, 10 star-forming, 26 "Green Valley" and 30 quiescent ones. The properties of different types of kinematically misaligned galaxies are different in that the star-forming ones have positive gradient in D4000 and higher gas-phase metallicity, while the green valley/quiescent ones have negative D4000 gradients and lower gas-phase metallicity on average. There is evidence that all types of the kinematically misaligned galaxies tend to live in more isolated environment. Based on all these observational results, we propose a scenario for the formation of star forming galaxies with kinematically misaligned gas and stars - the progenitor accretes misaligned gas from a gas-rich dwarf or cosmic web, the cancellation of angular momentum from gas-gas collisions between the pre-existing gas and the accreted gas largely accelerates gas inflow, leading to fast centrally-concentrated star-formation. The higher metallicity is due to enrichment from this star formation. For the kinematically misaligned green valley and quiescent galaxies, they might be formed through gas-poor progenitors accreting kinematically misaligned gas from satellites which are smaller in mass., 19 pages, 11 figures, published in MNRAS

Published
2016

11. Mapping and Simulating Systematics due to Spatially Varying Observing Conditions in DES Science Verification Data

Author

Antonella Palmese, Carlos Solans Sanchez, J. L. Marshall, William Wester, Kyler Kuehn, Martin Crocce, Eli S. Rykoff, D. L. Burke, Boris Leistedt, Jon J Thaler, David J. James, Michael T. Busha, J. Carretero, Yanming Zhang, V. Vikram, Ofer Lahav, David Brooks, Matthew R. Becker, Flavia Sobreira, Robert A. Gruendl, B. Flaugher, C. B. D'Andrea, M. E. C. Swanson, Pablo Fosalba, Carlos Cunha, Stephen M. Kent, C. L. Chang, E. M. Huff, A. Carnero Rosell, A. Roodman, Brian Nord, Claudio Bruderer, V. Scarpine, Daniel Thomas, E. Buckley-Geer, Emmanuel Bertin, A. Benoit-Lévy, Marcos Lima, E. J. Sanchez, Joshua A. Frieman, Ashley J. Ross, Peter Melchior, Ramon Miquel, R. C. Smith, Enrique Gaztanaga, Eduardo Rozo, I. Sadeh, I. Sevilla-Noarbe, Will J. Percival, M. March, Basilio X. Santiago, C. Bonnett, Alistair R. Walker, G. Gutierrez, Shantanu Desai, R. A. Bernstein, Joe Zuntz, M. Banerji, Darren L. DePoy, Marcelle Soares-Santos, Gregory Tarle, F. B. Abdalla, F. Elsner, A. K. Romer, Sahar S. Allam, E. Suchyta, August E. Evrard, Risa H. Wechsler, Ricardo L. C. Ogando, Paul Martini, M. Jarvis, L. N. da Costa, M. A. G. Maia, Alexandre Refregier, K. Honscheid, Adam Amara, A. Fausti Neto, Christopher J. Miller, Tim Eifler, Kevin Reil, Tenglin Li, Sarah Bridle, M. Carrasco Kind, Robert C. Nichol, N. P. Kuropatkin, Daniel Gruen, Hiranya V. Peiris, A. A. Plazas, Diego Capozzi, D. W. Gerdes, Peter Doel, H. T. Diehl, A. H. Bauer, Gary Bernstein, and M. S. Schubnell

Subjects
Cosmology and Gravitation, statistics [galaxies], Cosmology and Nongalactic Astrophysics (astro-ph.CO), media_common.quotation_subject, FOS: Physical sciences, Large Synoptic Survey Telescope, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, 0103 physical sciences, Deslocamento para o vermelho, galaxy surveys, Cluster analysis, 010303 astronomy & astrophysics, STFC, Weak gravitational lensing, QB, media_common, Aglomerados de galaxias, Mapeamentos astronômicos, Physics, large-scale structure of universe, spatial systematics, 010308 nuclear & particles physics, Astrophysics::Instrumentation and Methods for Astrophysics, precision cosmology, RCUK, Astronomy and Astrophysics, Redshift, Galaxy, observations [cosmology], Fotometria astronômica, Null (SQL), Space and Planetary Science, Sky, astro-ph.CO, Dark energy, distances and redshifts [galaxies], image simulations, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Spatially-varying depth and characteristics of observing conditions, such as seeing, airmass, or sky background, are major sources of systematic uncertainties in modern galaxy survey analyses, in particular in deep multi-epoch surveys. We present a framework to extract and project these sources of systematics onto the sky, and apply it to the Dark Energy Survey (DES) to map the observing conditions of the Science Verification (SV) data. The resulting distributions and maps of sources of systematics are used in several analyses of DES SV to perform detailed null tests with the data, and also to incorporate systematics in survey simulations. We illustrate the complementarity of these two approaches by comparing the SV data with the BCC-UFig, a synthetic sky catalogue generated by forward-modelling of the DES SV images. We analyse the BCC-UFig simulation to construct galaxy samples mimicking those used in SV galaxy clustering studies. We show that the spatially-varying survey depth imprinted in the observed galaxy densities and the redshift distributions of the SV data are successfully reproduced by the simulation and well-captured by the maps of observing conditions. The combined use of the maps, the SV data and the BCC-UFig simulation allows us to quantify the impact of spatial systematics on $N(z)$, the redshift distributions inferred using photometric redshifts. We conclude that spatial systematics in the SV data are mainly due to seeing fluctuations and are under control in current clustering and weak lensing analyses. The framework presented here is relevant to all multi-epoch surveys, and will be essential for exploiting future surveys such as the Large Synoptic Survey Telescope (LSST), which will require detailed null-tests and realistic end-to-end image simulations to correctly interpret the deep, high-cadence observations of the sky., 13 pages, 12 figures

Published
2016

12. The Dark Energy Survey: more than dark energy – an overview

Author

V. Scarpine, Peter Doel, Alex Drlica-Wagner, M. Carrasco-Kind, Eric H. Neilsen, H. T. Diehl, William G. Hartley, Martin Crocce, David Bacon, Jochen Weller, Huan Lin, Michael Schubnell, L. Clerkin, Daniel Thomas, E. Buckley-Geer, L. Whiteway, A. K. Romer, Paul Martini, J. Fabbri, Marcio A. G. Maia, Donnacha Kirk, Alistair R. Walker, Marcelle Soares-Santos, C. Bonnett, Brian Yanny, T. M. C. Abbott, Antonella Palmese, Erin Sheldon, David Brooks, M. E. C. Swanson, Hiranya V. Peiris, D. L. Burke, Shantanu Desai, E. J. Sanchez, Mathew Smith, Stephanie Jouvel, A. Benoit-Lévy, Vinu Vikram, Ryan J. Foley, I. Sadeh, A. L. King, Joe Zuntz, Jennifer L. Marshall, Ashley J. Ross, S. Allam, Marcella Carollo, Robert A. Gruendl, H. Wilcox, C. B. D'Andrea, J. Etherington, F. B. Abdalla, Bhuvnesh Jain, Xan Morice-Atkinson, Tesla E. Jeltema, F. Ostrovski, David J. James, Yanming Zhang, Christopher J. Miller, Ramon Miquel, A. Carnero-Rosell, C. Sánchez, John Peoples, B. Flaugher, Pablo Fosalba, E. Bertin, Ofer Lahav, Keith Bechtol, Maayane T. Soumagnac, Will J. Percival, Thomas E. Collett, Daniel Gruen, Nikolay Kuropatkin, A. Papadopoulos, W. C. Wester, Robert Connon Smith, Manda Banerji, Flavia Sobreira, Gary Bernstein, Jon J Thaler, Alex Merson, G. Gutierrez, P. Guarnieri, Brian Nord, G. B. Caminha, Basilio X. Santiago, Joseph J. Mohr, Eduardo Balbinot, S. L. Reed, Ricardo L. C. Ogando, Juan Estrada, Adam Amara, Risa H. Wechsler, E. Suchyta, August E. Evrard, Joaquin Vieira, Alexandre Refregier, Robert J. Brunner, Krishna Naidoo, Tianjun Li, Joshua A. Frieman, A. Roodman, Tommaso Giannantonio, I. Sevilla-Noarbe, Christopher J. Conselice, Claudia Maraston, A. A. Plazas, Diego Capozzi, L. N. da Costa, Robert C. Nichol, J. Carretero, D. W. Gerdes, Tamara M. Davis, Peter Melchior, Enrique Gaztanaga, Daniel A. Goldstein, Marc Manera, Francisco J. Castander, J. P. Dietrich, Richard G. McMahon, J. Carlsen, D. A. Finley, Mark Sullivan, Juan Garcia-Bellido, Eduardo Rozo, Jelena Aleksić, R. C. Thomas, Eli S. Rykoff, Richard G. Kron, K. Honscheid, Marcos Lima, Douglas L. Tucker, Kyler Kuehn, Jonathan Blazek, Sarah Bridle, Scott Dodelson, Carlos E. Cunha, Martin Makler, M. Sako, Richard Kessler, and G. Tarle

Subjects
Cosmology and Gravitation, Cosmology and Nongalactic Astrophysics (astro-ph.CO), supernovae, astro-ph.GA, quasars, FOS: Physical sciences, Library science, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Galaxies general, surveys, minor plantes, asteroids, galaxies, 0103 physical sciences, media_common.cataloged_instance, Deslocamento para o vermelho, European union, Astronomy observatory, Galáxias, 010303 astronomy & astrophysics, STFC, Astrophysics::Galaxy Astrophysics, media_common, QB, Physics, Mapeamentos astronômicos, 010308 nuclear & particles physics, Surveys minor planets, European research, RCUK, Astronomy, Astronomy and Astrophysics, Asteroids general, Astrophysics - Astrophysics of Galaxies, Quasars general, Supernovae general, Galaxy, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Fundamental physics, astro-ph.CO, Christian ministry, Galaxy general, National laboratory, surveys – minor planets, asteroids: general – supernovae: general – Galaxy: general – galaxies: general – quasars: general, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

This overview article describes the legacy prospect and discovery potential of the Dark Energy Survey (DES) beyond cosmological studies, illustrating it with examples from the DES early data. DES is using a wide-field camera (DECam) on the 4m Blanco Telescope in Chile to image 5000 sq deg of the sky in five filters (grizY). By its completion the survey is expected to have generated a catalogue of 300 million galaxies with photometric redshifts and 100 million stars. In addition, a time-domain survey search over 27 sq deg is expected to yield a sample of thousands of Type Ia supernovae and other transients. The main goals of DES are to characterise dark energy and dark matter, and to test alternative models of gravity; these goals will be pursued by studying large scale structure, cluster counts, weak gravitational lensing and Type Ia supernovae. However, DES also provides a rich data set which allows us to study many other aspects of astrophysics. In this paper we focus on additional science with DES, emphasizing areas where the survey makes a difference with respect to other current surveys. The paper illustrates, using early data (from `Science Verification', and from the first, second and third seasons of observations), what DES can tell us about the solar system, the Milky Way, galaxy evolution, quasars, and other topics. In addition, we show that if the cosmological model is assumed to be Lambda+ Cold Dark Matter (LCDM) then important astrophysics can be deduced from the primary DES probes. Highlights from DES early data include the discovery of 34 Trans Neptunian Objects, 17 dwarf satellites of the Milky Way, one published z > 6 quasar (and more confirmed) and two published superluminous supernovae (and more confirmed)., 32 pages, 15 figures; a revised Figure 1 and minor changes, to match the published MNRAS version

Published
2016

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

Author

Tommaso Giannantonio, Gregory Tarle, Tim Eifler, J. J. Thaler, B. Flaugher, Kyler Kuehn, Ricardo L. C. Ogando, Ofer Lahav, Robert J. Brunner, Carlos E. Cunha, Robert Connon Smith, K. Honscheid, R. Cawthon, G. Gutierrez, Boris Leistedt, Eric H. Neilsen, Nikolay Kuropatkin, J. Carretero, David J. James, Martin Crocce, Jochen Weller, M. Carrasco Kind, Eli S. Rykoff, M. Sako, H. T. Diehl, Robert C. Nichol, Pablo Fosalba, Brian Nord, T. M. C. Abbott, Hiranya V. Peiris, Daniel Thomas, David Brooks, M. E. C. Swanson, A. A. Plazas, M. A. G. Maia, E. J. Sanchez, A. Carnero Rosell, A. H. Bauer, E. Fernandez, Francisco J. Castander, E. Buckley-Geer, Diego Capozzi, E. Suchyta, Risa H. Wechsler, D. L. Burke, Michael Schubnell, Marcos Lima, August E. Evrard, Joe Zuntz, Edward J. Kim, Jennifer L. Marshall, Ashley J. Ross, Alistair R. Walker, C. B. D'Andrea, Tianjun Li, A. Benoit-Lévy, S. Allam, Robert A. Gruendl, Marcelle Soares-Santos, C. Bonnett, Ramon Miquel, Carles Sanchez, Shantanu Desai, Enrique Gaztanaga, F. B. Abdalla, E. Bertin, Will J. Percival, A. K. Romer, Gary Bernstein, Paul Martini, Javier Sanchez, Daniel Gruen, William G. Hartley, A. Fausti Neto, Peter Melchior, D. A. Finley, Vinu Vikram, Rogerio Rosenfeld, D. W. Gerdes, C. J. Miller, Flavia Sobreira, M. March, Basilio X. Santiago, I. Sevilla-Noarbe, L. N. da Costa, M. Banerji, Joshua A. Frieman, IEEC CSIC, Univ Autonoma Barcelona, Ohio State Univ, Ctr Invest Energet Medioambientales & Tecnol CIEM, Univ Illinois, Univ Cambridge, Fermilab Natl Accelerator Lab, Lab Interinst & E Astron LIneA, UCL, Observ Nacl, Univ Chicago, ETH, Univ Portsmouth, Universidade Estadual Paulista (Unesp), Stanford Univ, SLAC Natl Accelerator Lab, Cerro Tololo Interamer Observ, Rhodes Univ, Univ Calif Berkeley, Univ Penn, CNRS, Univ Paris 06, Excellence Cluster Universe, Univ Munich, CALTECH, Univ Michigan, Max Planck Inst Extraterr Phys, Australian Astron Observ, Texas A&M Univ, Universidade de São Paulo (USP), Univ Sussex, Univ Fed Rio Grande do Sul, Argonne Natl Lab, and Univ Manchester

Subjects
systematic effects, Cosmology and Gravitation, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Cold dark matter, Dark matter, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Surveys, 01 natural sciences, symbols.namesake, 0103 physical sciences, surveys - cosmology, observations - large-scale structure of Universe, Planck, Galáxias, observations [Cosmology], Cluster analysis, 010303 astronomy & astrophysics, STFC, Astrophysics::Galaxy Astrophysics, Photometric redshift, QB, Mapeamentos astronômicos, Physics, 010308 nuclear & particles physics, photometric surveys, RCUK, Astronomy, Astronomy and Astrophysics, galaxies clustering, Galaxy, Redshift, 13. Climate action, Space and Planetary Science, astro-ph.CO, Dark energy, symbols, large-scale structure of Universe, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We study the clustering of galaxies detected at $i, Comment: 23 pages, 18 figures, matches the version published in MNRAS. MNRAS 455, 4301-4324 (2015)

Published
2016

14. Mapping Seyfert and LINER excitation modes in the inner kpc of NGC 3393

Author

Giuseppina Fabbiano, Junfeng Wang, Martin Elvis, Alessandro Paggi, W. Peter Maksym, Margarita Karovska, John C. Raymond, Thaisa Storchi-Bergmann, ITA, and USA

Subjects
Seyfert [Galaxies], Active galactic nucleus, active [Galaxies], Astrophysics::High Energy Astrophysical Phenomena, galaxies: active, Doubly ionized oxygen, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, 01 natural sciences, Bicone, individual (NGC 3393) [Galaxies], Ionization, galaxies: individual (NGC 3393), galaxies: Seyfert, Astronomy and Astrophysics, Space and Planetary Science, 0103 physical sciences, Emission spectrum, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, High Energy Astrophysical Phenomena (astro-ph.HE), Physics, Mapeamentos astronômicos, 010308 nuclear & particles physics, Spatially resolved, Astrophysics - Astrophysics of Galaxies, Galaxy, Galaxias seyfert, Astrophysics of Galaxies (astro-ph.GA), Galáxia NGC 3393, Astrophysics - High Energy Astrophysical Phenomena, Excitation
Abstract

We have mapped the extended narrow line region (ENLR) of NGC 3393 on scales of $r\lesssim4^{\prime\prime}$ ($\sim1\,$kpc) from the nucleus using emission line images of H$\alpha\,\lambda6563$, [O III]$\lambda5007$, and [S II]$\lambda\lambda6717,6731$ taken with HST as part of the CHandra survey of Extended Emission line Regions in nearby Seyfert galaxies (CHEERS). By mapping these lines onto a spatially resolved Baldwin-Phillips-Terlevich (BPT) diagram, we investigate the impact of feedback from a Compton-thick AGN on its circumnuclear ISM. We find the expected Seyfert-like emission within the ionization bicone ($\lesssim3^{\prime\prime}$; 770 pc). We also find a new, figure 8 shaped LINER cocoon enveloping the bicone and defining a sharp ($\lesssim100\;$pc) transition between higher and lower ionization zones. These data illustrate the morphological dependence of ionization states of the ENLR relative to bicone and host gas geometries., Comment: Accepted by ApJ and published (2016, ApJ, 829, 46). Updated to reflect the accepted version

Published
2016

15. SDSS-IV MaNGA: The Impact of Diffuse Ionized Gas on Emission-line Ratios, Interpretation of Diagnostic Diagrams, and Gas Metallicity Measurements

Author

Amy Jones, Jon Brinkmann, Brett H. Andrews, Kevin Bundy, Thaisa Storchi Bergmann, Daniel Oravetz, Audrey Simmons, Daniel Thomas, Francesco Belfiore, Kai Zhang, Matthew A. Bershady, Kaike Pan, David R. Law, Christian Nitschelm, Rene A. M. Walterbos, L. Matthew Haffner, Renbin Yan, Alexandre Roman Lopes, Dmitry Bizyaev, Sebastián F. Sánchez, Cheng Li, Niv Drory, Christy Tremonti, Edmond Cheung, Aleksandar M. Diamond-Stanic, Joel R. Brownstein, Roberto Maiolino, Maiolino, Roberto [0000-0002-4985-3819], and Apollo - University of Cambridge Repository

Subjects
Cosmology and Gravitation, Active galactic nucleus, Metallicity, astro-ph.GA, galaxies: active, FOS: Physical sciences, Astrophysics, Metalicidade, Gas ionizado, 01 natural sciences, Formacao de galaxias, 0103 physical sciences, abundances [galaxies], Galaxy formation and evolution, Surface brightness, Emission spectrum, 010303 astronomy & astrophysics, surveys [galaxies], evolution [galaxies], STFC, Line (formation), fundamental parame- ters [galaxies], Physics, Mapeamentos astronômicos, ISM [galaxies], 010308 nuclear & particles physics, Astronomy, RCUK, galaxies: fundamental parameters, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Galaxy, Galáxias ativas, Stars, 13. Climate action, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), fundamental parameters [Galaxies], active [galaxies], galaxies: abundances, galaxies: evolution, galaxies: ISM
Abstract

Diffuse Ionized Gas (DIG) is prevalent in star-forming galaxies. Using a sample of 365 nearly face-on star-forming galaxies observed by MaNGA, we demonstrate how DIG in star-forming galaxies impacts the measurements of emission line ratios, hence the interpretation of diagnostic diagrams and gas-phase metallicity measurements. At fixed metallicity, DIG-dominated low H\alpha\ surface brightness regions display enhanced [SII]/H\alpha, [NII]/H\alpha, [OII]/H\beta, and [OI]/H\alpha. The gradients in these line ratios are determined by metallicity gradients and H\alpha\ surface brightness. In line ratio diagnostic diagrams, contamination by DIG moves HII regions towards composite or LI(N)ER-like regions. A harder ionizing spectrum is needed to explain DIG line ratios. Leaky HII region models can only shift line ratios slightly relative to HII region models, and thus fail to explain the composite/LI(N)ER line ratios displayed by DIG. Our result favors ionization by evolved stars as a major ionization source for DIG with LI(N)ER-like emission. DIG can significantly bias the measurement of gas metallicity and metallicity gradients derived using strong-line methods. Metallicities derived using N2O2 are optimal because they exhibit the smallest bias and error. Using O3N2, R23, N2=[NII]/H\alpha, and N2S2H\alpha\ (Dopita et al. 2016) to derive metallicities introduces bias in the derived metallicity gradients as large as the gradient itself. The strong-line method of Blanc et al. (2015; IZI hereafter) cannot be applied to DIG to get an accurate metallicity because it currently contains only HII region models which fail to describe the DIG., Comment: Accepted for publication in MNRAS, 30 pages, 32 figures

Published
2016
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16. Zooming into local active galactic nuclei: The power of combining SDSS-IV MaNGA with higher resolution integral field unit observations

Author

Rogemar A. Riffel, David R. Law, Michael A. Kelly, Jenny E. Greene, Daniel Thomas, Thaisa Storchi-Bergmann, Francisco Müller-Sánchez, Dominika Wylezalek, Guilin Liu, Jorge K. Barrera-Ballesteros, Allan Schnorr Müller, and Nadia L. Zakamska

Subjects
Active galactic nucleus, active [Galaxies], astro-ph.GA, media_common.quotation_subject, Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, spectroscopic [Techniques], Luminosity, Observatory, 0103 physical sciences, Cinemática, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, Spectrograph, Astrophysics::Galaxy Astrophysics, media_common, Mapeamentos astronômicos, Physics, kinematics and dynamics [Galaxies], 010308 nuclear & particles physics, imaging spectroscopy [Techniques], seyfert [Galaxies], Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Galaxias seyfert, Galaxy, Galáxias ativas, Space and Planetary Science, Sky, Astrophysics of Galaxies (astro-ph.GA), Outflow, Vector field, Nucleo galatico
Abstract

Ionised gas outflows driven by active galactic nuclei (AGN) are ubiquitous in high luminosity AGN with outflow speeds apparently correlated with the total bolometric luminosity of the AGN. This empirical relation and theoretical work suggest that in the range L_bol ~ 10^43-45 erg/s there must exist a threshold luminosity above which the AGN becomes powerful enough to launch winds that will be able to escape the galaxy potential. In this paper, we present pilot observations of two AGN in this transitional range that were taken with the Gemini North Multi-Object Spectrograph Integral Field Unit (IFU). Both sources have also previously been observed within the Sloan Digital Sky Survey-IV (SDSS) Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) survey. While the MaNGA IFU maps probe the gas fields on galaxy-wide scales and show that some regions are dominated by AGN ionization, the new Gemini IFU data zoom into the centre with four times better spatial resolution. In the object with the lower L_bol we find evidence of a young or stalled biconical AGN-driven outflow where none was obvious at the MaNGA resolution. In the object with the higher L_bol we trace the large-scale biconical outflow into the nuclear region and connect the outflow from small to large scales. These observations suggest that AGN luminosity and galaxy potential are crucial in shaping wind launching and propagation in low-luminosity AGN. The transition from small and young outflows to galaxy-wide feedback can only be understood by combining large-scale IFU data that trace the galaxy velocity field with higher resolution, small scale IFU maps., Comment: 14 pages, accepted for publication in MNRAS

Published
2016
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17. SDSS-IV MaNGA: Spatially Resolved Star Formation Main Sequence and LI(N)ER Sequence

Author

H. Ibarra, Médéric Boquien, Daniel Oravetz, M. Cano-Díaz, Rogério Riffel, Alex Hagen, Renbin Yan, Lihwai Lin, Irene Cruz-González, Hsi-An Pan, Jing Hua Lin, Chin Hao Hsu, Kaike Pan, Joel R. Brownstein, Kai Zhang, Bau-Ching Hsieh, Jorge K. Barrera-Ballesteros, Sebastián F. Sánchez, Audrey Simmons, and Dmitry Bizyaev

Subjects
Mapeamentos astronômicos, Physics, 010308 nuclear & particles physics, Star formation, Spatially resolved, FOS: Physical sciences, Sigma, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Star (graph theory), evolution [Galaxies], Astrophysics - Astrophysics of Galaxies, 01 natural sciences, Galaxy, Stars, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Formacao de estrelas, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Sequence (medicine)
Abstract

We present our study on the spatially resolved H_alpha and M_star relation for 536 star-forming and 424 quiescent galaxies taken from the MaNGA survey. We show that the star formation rate surface density (Sigma_SFR), derived based on the H_alpha emissions, is strongly correlated with the M_star surface density (Sigma_star) on kpc scales for star- forming galaxies and can be directly connected to the global star-forming sequence. This suggests that the global main sequence may be a consequence of a more fundamental relation on small scales. On the other hand, our result suggests that about 20% of quiescent galaxies in our sample still have star formation activities in the outer region with lower SSFR than typical star-forming galaxies. Meanwhile, we also find a tight correlation between Sigma_H_alpha and Sigma_star for LI(N)ER regions, named the resolved "LI(N)ER" sequence, in quiescent galaxies, which is consistent with the scenario that LI(N)ER emissions are primarily powered by the hot, evolved stars as suggested in the literature., Comment: 6 pages, 4 figures. ApJ Letter accepted

Published
2017

18. Analysis of cool DO-type white dwarfs from the Sloan Digital Sky Survey data release 10

Author

Klaus Werner, Boris T. Gänsicke, N. P. Gentile Fusillo, Nicole Reindl, Souza Oliveira Kepler, and Thomas Rauch

Subjects
media_common.quotation_subject, evolution [Stars], FOS: Physical sciences, Astrophysics, Type (model theory), Spectral line, Atmosphere, Evolucao estelar, Diffusion (business), Solar and Stellar Astrophysics (astro-ph.SR), media_common, Mapeamentos astronômicos, Physics, Mass distribution, White dwarfs, White dwarf, Astronomy and Astrophysics, AGB and post-AGB [Stars], Stars, Astrophysics - Solar and Stellar Astrophysics, Anãs brancas, 13. Climate action, Space and Planetary Science, Sky, abundances [Stars], Estrelas gigantes, Atmosferas estelares, Difusão
Abstract

We report on the identification of 22 new cool DO-type white dwarfs (WD) detected in Data Release 10 (DR10) of the Sloan Digital Sky Survey (SDSS). Among them, we found one more member of the so-called hot-wind DO WDs, which show ultrahigh excitation absorption lines. Our non-LTE model atmosphere analyses of these objects and two not previously analyzed hot-wind DO WDs, revealed effective temperatures and gravities in the ranges Teff=45-80kK and log g= 7.50-8.75. In eight of the spectra we found traces of C (0.001-0.01, by mass). Two of these are the coolest DO WDs ever discovered that still show a considerable amount of C in their atmospheres. This is in strong contradiction with diffusion calculations, and probably, similar to what is proposed for DB WDs, a weak mass-loss is present in DO WDs. One object is the most massive DO WD discovered so far with a mass of 1.07 M_sun if it is an ONe-WD or 1.09 M_sun if it is a CO-WD. We furthermore present the mass distribution of all known hot non-DA (pre-) WDs and derive the hot DA to non-DA ratio for the SDSS DR7 spectroscopic sample. The mass distribution of DO WDs beyond the wind limit strongly deviates from the mass distribution of the objects before the wind limit. We address this phenomenon by applying different evolutionary input channels. We argue that the DO WD channel may be fed by about 13% by post-extreme-horizontal branch stars and that PG1159 stars and O(He) stars may contribute in a similar extent to the non-DA WD channel., Comment: 13 pages, accepted for publication in A&A

Published
2014
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19. Photometric redshift analysis in the Dark Energy Survey science verification data

Author

Basilio X. Santiago, Adam Amara, Fang Yuan, Paulo S. Pellegrini, G. Tarle, F. Ostrovski, A. Sypniewski, Darren L. DePoy, Tamara M. Davis, Jennifer L. Marshall, C. Bonnett, Shantanu Desai, Peter Doel, A. Carnero, Ricardo L. C. Ogando, Tim Abbot, C. Lidman, Huan Lin, Marcos Lima, N. Greisel, A. Roodman, I. Sevilla-Noarbe, Arjun Dey, Syed Uddin, Douglas L. Tucker, Carles Sanchez, Kyler Kuehn, E. J. Sanchez, Enrique Gaztanaga, I. Sadeh, J. P. Bernstein, Marcio A. G. Maia, Joe Zuntz, H. T. Diehl, F. Valdes, Daniel Thomas, E. Buckley-Geer, Stephanie Jouvel, Martin Makler, William G. Hartley, P. Martí, Robert Connon Smith, M. Sako, A. G. Kim, N. Kuropatkin, A. Fausti, D. L. Burke, J. de Vicente, Richard Scalzo, Alistair R. Walker, Ofer Lahav, Karl Glazebrook, L. N. da Costa, August E. Evrard, Carlos E. Cunha, Robert J. Brunner, S. Allam, Stella Seitz, E. Fernandez, M. Carrasco Kind, Robert C. Nichol, F. B. Abdalla, D. A. Finley, J. Gschwend, Francisco J. Castander, Gary Bernstein, Markus Michael Rau, B. Flaugher, Juan Estrada, Joshua A. Frieman, Diego Capozzi, M. E. C. Swanson, M. J. Childress, K. Honscheid, D. W. Gerdes, David W. Atlee, Ramon Miquel, and Manda Banerji

Subjects
Cosmology and Gravitation, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Large-scale structure of Universe, FOS: Physical sciences, Sample (statistics), Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, statistics [Galaxies], Calibration, distances and redshifts [Galaxies], Instrumentation and Methods for Astrophysics (astro-ph.IM), STFC, Photometric redshift, Physics, Mapeamentos astronômicos, surveys [Astronomical data bases], RCUK, Astronomy and Astrophysics, GALÁXIAS, Redshift survey, Redshift, Galaxy, Random forest, Space and Planetary Science, astro-ph.CO, Dark energy, Astrophysics - Instrumentation and Methods for Astrophysics, ST/K00090X/1, astro-ph.IM, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We present results from a study of the photometric redshift performance of the Dark Energy Survey (DES), using the early data from a Science Verification (SV) period of observations in late 2012 and early 2013 that provided science-quality images for almost 200 sq.~deg.~at the nominal depth of the survey. We assess the photometric redshift performance using about 15000 galaxies with spectroscopic redshifts available from other surveys. These galaxies are used, in different configurations, as a calibration sample, and photo-$z$'s are obtained and studied using most of the existing photo-$z$ codes. A weighting method in a multi-dimensional color-magnitude space is applied to the spectroscopic sample in order to evaluate the photo-$z$ performance with sets that mimic the full DES photometric sample, which is on average significantly deeper than the calibration sample due to the limited depth of spectroscopic surveys. Empirical photo-$z$ methods using, for instance, Artificial Neural Networks or Random Forests, yield the best performance in the tests, achieving core photo-$z$ resolutions $\sigma_{68} \sim 0.08$. Moreover, the results from most of the codes, including template fitting methods, comfortably meet the DES requirements on photo-$z$ performance, therefore, providing an excellent precedent for future DES data sets., Comment: Published in MNRAS. This version accounts for minor comments in the journal review

Published
2014

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

Author

Mathias Schultheis, Courtney R. Epstein, Scott W. Fleming, Kyle M. Cudworth, Damian Fabbian, D. A. Garcia Hernandez, S. D. Chojnowski, Ryan Terrien, Sz. Meszaros, Léo Girardi, Jon A. Holtzman, Rachael L. Beaton, Jennifer A. Johnson, H. J. Rocha Pinto, Brett H. Andrews, Ricardo P. Schiavon, Steven R. Majewski, Rohit Deshpande, Basilio X. Santiago, Marc H. Pinsonneault, Matthew Shetrone, C. Allende Prieto, Kate Jackson, A. Herrero, Mike Skrutskie, Peter M. Frinchaboy, Gail Zasowski, Sten Hasselquist, Andrew J. Burton, Robert W. O'Connell, David L. Nidever, Cullen H. Blake, Frederick R. Hearty, D. Bizyaev, M. A. G. Maia, Christine O'Donnell, Verne V. Smith, L. N. da Costa, Kevin R. Covey, Jeffrey A. Munn, Katia Cunha, John C. Wilson, A. E. Garcia Perez, Suvrath Mahadevan, J. van Saders, Kris Sellgren, Ohio State University [Columbus] (OSU), University of Virginia [Charlottesville], Texas Christian University (TCU), INAF - Osservatorio Astronomico di Padova (OAPD), Istituto Nazionale di Astrofisica (INAF), Princeton University, Department of Astronomy and Astrophysics [PennState], Pennsylvania State University (Penn State), Penn State System-Penn State System, Instituto de Astrofisica de Canarias (IAC), Universidad de La Laguna [Tenerife - SP] (ULL), Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Apache point observatory, Astrophysics Research Institute [Liverpool] (ARI), Liverpool John Moores University (LJMU), McDonald Observatory, and University of Texas at Austin [Austin]

Subjects
Red giant, Milky Way, Metallicity, Extinction (astronomy), FOS: Physical sciences, Astrophysics, Galaxia, Espectros astronômicos, Astrophysics::Cosmology and Extragalactic Astrophysics, Surveys, 01 natural sciences, Astronomia infravermelha, surveys, Observatory, Bulge, 0103 physical sciences, Telescópios astronômicos, 010303 astronomy & astrophysics, Tecnicas astronomicas, stars: general, Astrophysics::Galaxy Astrophysics, Physics, Mapeamentos astronômicos, general [Stars], 010308 nuclear & particles physics, Astrophysics::Instrumentation and Methods for Astrophysics, abundances [Galaxy], Astronomy and Astrophysics, kinematics and dynamics [Galaxy], Astrophysics - Astrophysics of Galaxies, Galaxy, Stars, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Estrelas gigantes, Galaxy: abundances, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Galaxy: kinematics and dynamics
Abstract

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 dynamical and chemical evolution models of the Milky Way. APOGEE takes advantage of the reduced effects of extinction at infrared wavelengths to observe the inner Galaxy and bulge at an unprecedented level of detail. The survey's broad spatial and wavelength coverage enables users of APOGEE data to address numerous Galactic structure and stellar populations issues. In this paper we describe the APOGEE targeting scheme and document its various target classes to provide the necessary background and reference information to analyze samples of APOGEE data with awareness of the imposed selection criteria and resulting sample properties. APOGEE's primary sample consists of ~100,000 red giant stars, selected to minimize observational biases in age and metallicity. We present the methodology and considerations that drive the selection of this sample and evaluate the accuracy, efficiency, and caveats of the selection and sampling algorithms. We also describe additional target classes that contribute to the APOGEE sample, including numerous ancillary science programs, and we outline the targeting data that will be included in the public data releases., Accepted to AJ. 31 pages, 11 figures

Published
2013

21. The Ninth Data Release of the Sloan Digital Sky Survey: First Spectroscopic Data from the SDSS-III Baryon Oscillation Spectroscopic Survey

Author

Christopher P. Ahn, Rachael Alexandroff, Carlos Allende Prieto, Scott F. Anderson, Timothy Anderton, Brett H. Andrews, Éric Aubourg, Stephen Bailey, Eduardo Balbinot, Rory Barnes, Julian Bautista, Timothy C. Beers, Alessandra Beifiori, Andreas A. Berlind, Vaishali Bhardwaj, Dmitry Bizyaev, Cullen H. Blake, Michael R. Blanton, Michael Blomqvist, John J. Bochanski, Adam S. Bolton, Arnaud Borde, Jo Bovy, W. N. Brandt, J. Brinkmann, Peter J. Brown, Joel R. Brownstein, Kevin Bundy, N. G. Busca, William Carithers, Aurelio R. Carnero, Michael A. Carr, Dana I. Casetti-Dinescu, Yanmei Chen, Cristina Chiappini, Johan Comparat, Natalia Connolly, Justin R. Crepp, Stefano Cristiani, Rupert A. C. Croft, Antonio J. Cuesta, Luiz N. da Costa, James R. A. Davenport, Kyle S. Dawson, Roland de Putter, Nathan De Lee, Timothée Delubac, Saurav Dhital, Anne Ealet, Garrett L. Ebelke, Edward M. Edmondson, Daniel J. Eisenstein, S. Escoffier, Massimiliano Esposito, Michael L. Evans, Xiaohui Fan, Bruno Femenía Castellá, Emma Fernández Alvar, Leticia D. Ferreira, N. Filiz Ak, Hayley Finley, Scott W. Fleming, Andreu Font-Ribera, Peter M. Frinchaboy, D. A. García-Hernández, A. E. García Pérez, Jian Ge, R. Génova-Santos, Bruce A. Gillespie, Léo Girardi, Jonay I. González Hernández, Eva K. Grebel, James E. Gunn, Hong Guo, Daryl Haggard, Jean-Christophe Hamilton, David W. Harris, Suzanne L. Hawley, Frederick R. Hearty, Shirley Ho, David W. Hogg, Jon A. Holtzman, Klaus Honscheid, J. Huehnerhoff, Inese I. Ivans, Željko Ivezić, Heather R. Jacobson, Linhua Jiang, Jonas Johansson, Jennifer A. Johnson, Guinevere Kauffmann, David Kirkby, Jessica A. Kirkpatrick, Mark A. Klaene, Gillian R. Knapp, Jean-Paul Kneib, Jean-Marc Le Goff, Alexie Leauthaud, Khee-Gan Lee, Young Sun Lee, Daniel C. Long, Craig P. Loomis, Sara Lucatello, Britt Lundgren, Robert H. Lupton, Bo Ma, Zhibo Ma, Nicholas MacDonald, Claude E. Mack, Suvrath Mahadevan, Marcio A. G. Maia, Steven R. Majewski, Martin Makler, Elena Malanushenko, Viktor Malanushenko, A. Manchado, Rachel Mandelbaum, Marc Manera, Claudia Maraston, Daniel Margala, Sarah L. Martell, Cameron K. McBride, Ian D. McGreer, Richard G. McMahon, Brice Ménard, Sz. Meszaros, Jordi Miralda-Escudé, Antonio D. Montero-Dorta, Francesco Montesano, Heather L. Morrison, Demitri Muna, Jeffrey A. Munn, Hitoshi Murayama, Adam D. Myers, A. F. Neto, Duy Cuong Nguyen, Robert C. Nichol, David L. Nidever, Pasquier Noterdaeme, Sebastián E. Nuza, Ricardo L. C. Ogando, Matthew D. Olmstead, Daniel J. Oravetz, Russell Owen, Nikhil Padmanabhan, Nathalie Palanque-Delabrouille, Kaike Pan, John K. Parejko, Prachi Parihar, Isabelle Pâris, Petchara Pattarakijwanich, Joshua Pepper, Will J. Percival, Ismael Pérez-Fournon, Ignasi Pérez-Ràfols, Patrick Petitjean, Janine Pforr, Matthew M. Pieri, Marc H. Pinsonneault, G. F. Porto de Mello, Francisco Prada, Adrian M. Price-Whelan, M. Jordan Raddick, Rafael Rebolo, James Rich, Gordon T. Richards, Annie C. Robin, Helio J. Rocha-Pinto, Constance M. Rockosi, Natalie A. Roe, Ashley J. Ross, Nicholas P. Ross, Graziano Rossi, J. A. Rubiño-Martin, Lado Samushia, J. Sanchez Almeida, Ariel G. Sánchez, Basílio Santiago, Conor Sayres, David J. Schlegel, Katharine J. Schlesinger, Sarah J. Schmidt, Donald P. Schneider, Mathias Schultheis, Axel D. Schwope, C. G. Scóccola, Uros Seljak, Erin Sheldon, Yue Shen, Yiping Shu, Jennifer Simmerer, Audrey E. Simmons, Ramin A. Skibba, M. F. Skrutskie, A. Slosar, Flavia Sobreira, Jennifer S. Sobeck, Keivan G. Stassun, Oliver Steele, Matthias Steinmetz, Michael A. Strauss, Alina Streblyanska, Nao Suzuki, Molly E. C. Swanson, Tomer Tal, Aniruddha R. Thakar, Daniel Thomas, Benjamin A. Thompson, Jeremy L. Tinker, Rita Tojeiro, Christy A. Tremonti, M. Vargas Magaña, Licia Verde, Matteo Viel, Shailendra K. Vikas, Nicole P. Vogt, David A. Wake, Ji Wang, Benjamin A. Weaver, David H. Weinberg, Benjamin J. Weiner, Andrew A. West, Martin White, John C. Wilson, John P. Wisniewski, W. M. Wood-Vasey, Brian Yanny, Christophe Yèche, Donald G. York, O. Zamora, Gail Zasowski, Idit Zehavi, Gong-Bo Zhao, Zheng Zheng, Guangtun Zhu, Joel C. Zinn, APC - Cosmologie, Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-AstroParticule et Cosmologie (APC (UMR_7164)), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), AstroParticule et Cosmologie (APC (UMR_7164)), Centre de Physique des Particules de Marseille (CPPM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU), BOSS, Instituto de Astrofisica de Canarias (IAC), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Elon University [NC, USA], Department of Astronomy [Seattle], University of Washington [Seattle], The University of Notre Dame [Sydney], Apache point observatory, Laboratoire d'Astrophysique de Marseille (LAM), Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS), Département de Physique des Particules (ex SPP) (DPhP), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut d'Astrophysique de Paris (IAP), Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS), Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), Unité Scientifique de la Station de Nançay (USN), Centre National de la Recherche Scientifique (CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire des Sciences de l'Univers en région Centre (OSUC), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)-Université d'Orléans (UO), Universitat de Barcelona, Observatoire des Sciences de l'Univers en région Centre (OSUC), and Université Paris sciences et lettres (PSL)-Université d'Orléans (UO)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Atles, Astrophysics, Surveys, 01 natural sciences, Astronomical spectroscopy, Via láctea, Observatory, Observacions astronòmiques, Physical Sciences and Mathematics, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, ComputingMilieux_MISCELLANEOUS, media_common, Mapeamentos astronômicos, Physics, [PHYS]Physics [physics], Astrophysics::Instrumentation and Methods for Astrophysics, Atlases, Astrometry, Cosmology, atlases, Instrumentation and Methods for Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics, Astronomical observations, Cosmology and Gravitation, Cosmology and Nongalactic Astrophysics (astro-ph.CO), [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], media_common.quotation_subject, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, catalogs, surveys, Formacao de galaxias, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Settore FIS/05 - Astronomia e Astrofisica, 0103 physical sciences, Instrumentation and Methods for Astrophysics (astro-ph.IM), Spectrograph, Astrophysics::Galaxy Astrophysics, Cosmologia, 010308 nuclear & particles physics, Astronomy and Astrophysics, Quasar, Cosmology and Extragalactic Astrophysics, Espectroscòpia, Galaxy, Spectrum analysis, [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], Stars, Space and Planetary Science, Sky, Catalogs, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

The Sloan Digital Sky Survey III (SDSS-III) presents the first spectroscopic data from the Baryon Oscillation Spectroscopic Survey (BOSS). This ninth data release (DR9) of the SDSS project includes 535,995 new galaxy spectra (median z=0.52), 102,100 new quasar spectra (median z=2.32), and 90,897 new stellar spectra, along with the data presented in previous data releases. These spectra were obtained with the new BOSS spectrograph and were taken between 2009 December and 2011 July. In addition, the stellar parameters pipeline, which determines radial velocities, surface temperatures, surface gravities, and metallicities of stars, has been updated and refined with improvements in temperature estimates for stars with T_eff-0.5. DR9 includes new stellar parameters for all stars presented in DR8, including stars from SDSS-I and II, as well as those observed as part of the SDSS-III Sloan Extension for Galactic Understanding and Exploration-2 (SEGUE-2). The astrometry error introduced in the DR8 imaging catalogs has been corrected in the DR9 data products. The next data release for SDSS-III will be in Summer 2013, which will present the first data from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) along with another year of data from BOSS, followed by the final SDSS-III data release in December 2014., 9 figures; 2 tables. Submitted to ApJS. DR9 is available at http://www.sdss3.org/dr9

Published
2012

22. TheGaia-ESO Survey: radial metallicity gradients and age-metallicity relation of stars in the Milky Way disk

Author

M. Bergemann, G. R. Ruchti, A. Serenelli, S. Feltzing, A. Alves-Brito, M. Asplund, T. Bensby, P. Gruiters, U. Heiter, A. Hourihane, A. Korn, K. Lind, A. Marino, P. Jofre, T. Nordlander, N. Ryde, C. C. Worley, G. Gilmore, S. Randich, A. M. N. Ferguson, R. D. Jeffries, G. Micela, I. Negueruela, T. Prusti, H.-W. Rix, A. Vallenari, E. J. Alfaro, C. Allende Prieto, A. Bragaglia, S. E. Koposov, A. C. Lanzafame, E. Pancino, A. Recio-Blanco, R. Smiljanic, N. Walton, M. T. Costado, E. Franciosini, V. Hill, C. Lardo, P. de Laverny, L. Magrini, E. Maiorca, T. Masseron, L. Morbidelli, G. Sacco, G. Kordopatis, G. Tautvaišienė, Universidad de Alicante. Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Astrofísica Estelar (AE), Bergemann M., Ruchti G.R., Serenelli A., Feltzing S., Alves-Brito A., Asplund M., Bensby T., Gruiters P., Heiter U., Hourihane A., Korn A., Lind K., Marino A., Jofre P., Nordlander T., Ryde N., Worley C.C., Gilmore G., Randich S., Ferguson A.M.N., Jeffries R.D., Micela G., Negueruela I., Prusti T., Rix H.-W., Vallenari A., Alfaro E.J., Allende Prieto C., Bragaglia A., Koposov S.E., Lanzafame A.C., Pancino E., Recio-Blanco A., Smiljanic R., Walton N., Costado M.T., Franciosini E., Hill V., Lardo C., De Laverny P., Magrini L., Maiorca E., Masseron T., Morbidelli L., Sacco G., Kordopatis G., and Tautvaisiene G.

Subjects
Solar neighborhood, Milky Way, Metallicity, Formation, FOS: Physical sciences, Galaxia, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Surveys, fundamental parameters [Stars], Astronomia ultravioleta, 01 natural sciences, Spectral line, Galaxy: disk, Stars:fundamental parameter, Fundamental parameters, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, Abundances, Disc, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, Astronomía y Astrofísica, Mapeamentos astronômicos, Physics, 010308 nuclear & particles physics, Plane (geometry), Stars:abundance, Vertical distance, Astronomy and Astrophysics, Composicao estelar, Astrophysics - Astrophysics of Galaxies, Espectros estelares, Stars, Galaxy, formation [Galaxy], Galaxy: formation, Disk, Space and Planetary Science, abundances [Stars], Astrophysics of Galaxies (astro-ph.GA), Magnitude (astronomy), Astrophysics::Earth and Planetary Astrophysics, disk [Galaxy]
Abstract

We study the relationship between age, metallicity, and alpha-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 explore the limitations of the observed dataset, i.e. the accuracy of stellar parameters and the selection effects that are caused by the photometric target preselection. We find that the colour and magnitude cuts in the survey suppress old metal-rich stars and young metal-poor stars. This suppression may be as high as 97% in some regions of the age-metallicity relationship. The dataset consists of 144 stars with a wide range of ages from 0.5 Gyr to 13.5 Gyr, Galactocentric distances from 6 kpc to 9.5 kpc, and vertical distances from the plane 0 < |Z| < 1.5 kpc. On this basis, we find that i) the observed age-metallicity relation is nearly flat in the range of ages between 0 Gyr and 8 Gyr; ii) at ages older than 9 Gyr, we see a decrease in [Fe/H] and a clear absence of metal-rich stars; this cannot be explained by the survey selection functions; iii) there is a significant scatter of [Fe/H] at any age; and iv) [Mg/Fe] increases with age, but the dispersion of [Mg/Fe] at ages > 9 Gyr is not as small as advocated by some other studies. In agreement with earlier work, we find that radial abundance gradients change as a function of vertical distance from the plane. The [Mg/Fe] gradient steepens and becomes negative. In addition, we show that the inner disk is not only more alpha-rich compared to the outer disk, but also older, as traced independently by the ages and Mg abundances of stars., accepted for publication in A&A

Published
2014

23. THE TENTH DATA RELEASE OF THE SLOAN DIGITAL SKY SURVEY: FIRST SPECTROSCOPIC DATA FROM THE SDSS-III APACHE POINT OBSERVATORY GALACTIC EVOLUTION EXPERIMENT

Author

Christopher P. Ahn, Rachael Alexandroff, Carlos Allende Prieto, Friedrich Anders, Scott F. Anderson, Timothy Anderton, Brett H. Andrews, Éric Aubourg, Stephen Bailey, Fabienne A. Bastien, Julian E. Bautista, Timothy C. Beers, Alessandra Beifiori, Chad F. Bender, Andreas A. Berlind, Florian Beutler, Vaishali Bhardwaj, Jonathan C. Bird, Dmitry Bizyaev, Cullen H. Blake, Michael R. Blanton, Michael Blomqvist, John J. Bochanski, Adam S. Bolton, Arnaud Borde, Jo Bovy, Alaina Shelden Bradley, W. N. Brandt, Dorothée Brauer, J. Brinkmann, Joel R. Brownstein, Nicolás G. Busca, William Carithers, Joleen K. Carlberg, Aurelio R. Carnero, Michael A. Carr, Cristina Chiappini, S. Drew Chojnowski, Chia-Hsun Chuang, Johan Comparat, Justin R. Crepp, Stefano Cristiani, Rupert A. C. Croft, Antonio J. Cuesta, Katia Cunha, Luiz N. da Costa, Kyle S. Dawson, Nathan De Lee, Janice D. R. Dean, Timothée Delubac, Rohit Deshpande, Saurav Dhital, Anne Ealet, Garrett L. Ebelke, Edward M. Edmondson, Daniel J. Eisenstein, Courtney R. Epstein, Stephanie Escoffier, Massimiliano Esposito, Michael L. Evans, D. Fabbian, Xiaohui Fan, Ginevra Favole, Bruno Femenía Castellá, Emma Fernández Alvar, Diane Feuillet, Nurten Filiz Ak, Hayley Finley, Scott W. Fleming, Andreu Font-Ribera, Peter M. Frinchaboy, J. G. Galbraith-Frew, D. A. García-Hernández, Ana E. García Pérez, Jian Ge, R. Génova-Santos, Bruce A. Gillespie, Léo Girardi, Jonay I. González Hernández, J. Richard Gott, James E. Gunn, Hong Guo, Samuel Halverson, Paul Harding, David W. Harris, Sten Hasselquist, Suzanne L. Hawley, Michael Hayden, Frederick R. Hearty, Artemio Herrero Davó, Shirley Ho, David W. Hogg, Jon A. Holtzman, Klaus Honscheid, Joseph Huehnerhoff, Inese I. Ivans, Kelly M. Jackson, Peng Jiang, Jennifer A. Johnson, K. Kinemuchi, David Kirkby, Mark A. Klaene, Jean-Paul Kneib, Lars Koesterke, Ting-Wen Lan, Dustin Lang, Jean-Marc Le Goff, Alexie Leauthaud, Khee-Gan Lee, Young Sun Lee, Daniel C. Long, Craig P. Loomis, Sara Lucatello, Robert H. Lupton, Bo Ma, Claude E. Mack, Suvrath Mahadevan, Marcio A. G. Maia, Steven R. Majewski, Elena Malanushenko, Viktor Malanushenko, A. Manchado, Marc Manera, Claudia Maraston, Daniel Margala, Sarah L. Martell, Karen L. Masters, Cameron K. McBride, Ian D. McGreer, Richard G. McMahon, Brice Ménard, Sz. Mészáros, Jordi Miralda-Escudé, Hironao Miyatake, Antonio D. Montero-Dorta, Francesco Montesano, Surhud More, Heather L. Morrison, Demitri Muna, Jeffrey A. Munn, Adam D. Myers, Duy Cuong Nguyen, Robert C. Nichol, David L. Nidever, Pasquier Noterdaeme, Sebastián E. Nuza, Julia E. O'Connell, Robert W. O'Connell, Ross O'Connell, Matthew D. Olmstead, Daniel J. Oravetz, Russell Owen, Nikhil Padmanabhan, Nathalie Palanque-Delabrouille, Kaike Pan, John K. Parejko, Prachi Parihar, Isabelle Pâris, Joshua Pepper, Will J. Percival, Ignasi Pérez-Ràfols, Hélio Dotto Perottoni, Patrick Petitjean, Matthew M. Pieri, M. H. Pinsonneault, Francisco Prada, Adrian M. Price-Whelan, M. Jordan Raddick, Mubdi Rahman, Rafael Rebolo, Beth A. Reid, Jonathan C. Richards, Rogério Riffel, Annie C. Robin, H. J. Rocha-Pinto, Constance M. Rockosi, Natalie A. Roe, Ashley J. Ross, Nicholas P. Ross, Graziano Rossi, Arpita Roy, J. A. Rubiño-Martin, Cristiano G. Sabiu, Ariel G. Sánchez, Basílio Santiago, Conor Sayres, Ricardo P. Schiavon, David J. Schlegel, Katharine J. Schlesinger, Sarah J. Schmidt, Donald P. Schneider, Mathias Schultheis, Kris Sellgren, Hee-Jong Seo, Yue Shen, Matthew Shetrone, Yiping Shu, Audrey E. Simmons, M. F. Skrutskie, Anže Slosar, Verne V. Smith, Stephanie A. Snedden, Jennifer S. Sobeck, Flavia Sobreira, Keivan G. Stassun, Matthias Steinmetz, Michael A. Strauss, Alina Streblyanska, Nao Suzuki, Molly E. C. Swanson, Ryan C. Terrien, Aniruddha R. Thakar, Daniel Thomas, Benjamin A. Thompson, Jeremy L. Tinker, Rita Tojeiro, Nicholas W. Troup, Jan Vandenberg, Mariana Vargas Magaña, Matteo Viel, Nicole P. Vogt, David A. Wake, Benjamin A. Weaver, David H. Weinberg, Benjamin J. Weiner, Martin White, Simon D. M. White, John C. Wilson, John P. Wisniewski, W. M. Wood-Vasey, Christophe Yèche, Donald G. York, O. Zamora, Gail Zasowski, Idit Zehavi, Gong-Bo Zhao, Zheng Zheng, Guangtun Zhu, University of St Andrews. School of Physics and Astronomy, APC - Cosmologie, AstroParticule et Cosmologie (APC (UMR_7164)), Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Centre de Physique des Particules de Marseille (CPPM), Aix Marseille Université (AMU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Univers, Transport, Interfaces, Nanostructures, Atmosphère et environnement, Molécules (UMR 6213) (UTINAM), Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC), Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC), BOSS, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Universitat de Barcelona, Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Physique Corpusculaire et Cosmologie - Collège de France (PCC), Collège de France (CdF)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Collège de France (CdF)-Centre National de la Recherche Scientifique (CNRS), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Aix Marseille Université (AMU)

Subjects
[SDU.ASTR.CO]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Red giant, Espectros astronômicos, Astrophysics, Surveys, Astronomical spectroscopy, Observatory, Observacions astronòmiques, QB Astronomy, Astrophysics::Solar and Stellar Astrophysics, QC, QB, media_common, Mapeamentos astronômicos, Physics, Astrophysics::Instrumentation and Methods for Astrophysics, Atlases, Cosmology, atlases, [SDU.ASTR.GA]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA], Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics, Astronomical observations, Cosmology and Gravitation, Cosmology and Nongalactic Astrophysics (astro-ph.CO), [PHYS.ASTR.IM]Physics [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], media_common.quotation_subject, Milky Way, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, catalogs, surveys, [PHYS.ASTR.CO]Physics [physics]/Astrophysics [astro-ph]/Cosmology and Extra-Galactic Astrophysics [astro-ph.CO], Settore FIS/05 - Astronomia e Astrofisica, Galaxy formation and evolution, Instrumentation and Methods for Astrophysics (astro-ph.IM), Astrophysics::Galaxy Astrophysics, Cosmologia, Astronomy and Astrophysics, Quasar, Espectroscòpia, Astrophysics - Astrophysics of Galaxies, Spectrum analysis, Galaxy, [SDU.ASTR.IM]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Instrumentation and Methods for Astrophysic [astro-ph.IM], [PHYS.ASTR.GA]Physics [physics]/Astrophysics [astro-ph]/Galactic Astrophysics [astro-ph.GA], QC Physics, 13. Climate action, Space and Planetary Science, Sky, Astrophysics of Galaxies (astro-ph.GA), Catalogos astronomicos, Catalogs
Abstract

The Sloan Digital Sky Survey (SDSS) has been in operation since 2000 April. This paper presents the tenth public data release (DR10) from its current incarnation, SDSS-III. This data release includes the first spectroscopic data from the Apache Point Observatory Galaxy Evolution Experiment (APOGEE), along with spectroscopic data from the Baryon Oscillation Spectroscopic Survey (BOSS) taken through 2012 July. The APOGEE instrument is a near-infrared R~22,500 300-fiber spectrograph covering 1.514--1.696 microns. The APOGEE survey is studying the chemical abundances and radial velocities of roughly 100,000 red giant star candidates in the bulge, bar, disk, and halo of the Milky Way. DR10 includes 178,397 spectra of 57,454 stars, each typically observed three or more times, from APOGEE. Derived quantities from these spectra (radial velocities, effective temperatures, surface gravities, and metallicities) are also included.DR10 also roughly doubles the number of BOSS spectra over those included in the ninth data release. DR10 includes a total of 1,507,954 BOSS spectra, comprising 927,844 galaxy spectra; 182,009 quasar spectra; and 159,327 stellar spectra, selected over 6373.2 square degrees., 15 figures; 1 table. Accepted to ApJS. DR10 is available at http://www.sdss3.org/dr10 v3 fixed 3 diacritic markings in the arXiv HTML listing of the author names

Published
2014

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