Browsing Exact and Earth Sciences by Author "Bizyaev, D."

Now showing items 1-20 of 35

    • A cautionary tale : marvels brown dwarf candidate reveals itself to be a very long period, highly eccentric spectroscopic stellar binary 

      Mack, C. E.; Ge, Jian; Deshpande, Rohit; Wisniewski, J.P.; Stassun, Keivan G.; Gaudi, B. S.; Fleming, S.W.; Mahadevan, Suvrath; De Lee, Nathan M.; Eastman, Jason; Ghezzi, Luan; González Hernández, Jonay I.; Femenía Castellá, B.; Ferreira, Letícia D.; Mello, Gustavo Frederico Porto de; Crepp, Justin R.; Mata Sánchez, Daniel; Agol, Eric; Beatty, Thomas G.; Bizyaev, D.; Brewington, Howard J.; Cargile, Phillip A.; Costa, Luiz N. da; Esposito, Massimiliano; Ebelke, Garrett L.; Hebb, Leslie; Jiang, Peng; Kane, Stephen R.; Lee, Brian L.; Maia, Marcio Antonio Geimba; Malanushenko, E.; Malanushenko, V.; Oravetz, Daniel J.; Paegert, Martin; Pan, K.; Allende Prieto, Carlos; Pepper, J.; Rebolo, Rafael; Roy, Arpita; Santiago, Basilio Xavier; Schneider, D.P.; Simmons, Audrey E.; Siverd, Robert J.; Snedden, S.A.; Tofflemire, Benjamin M. (2013) [Journal article]
      We report the discovery of a highly eccentric, double-lined spectroscopic binary star system (TYC 3010-1494-1), comprising two solar-type stars that we had initially identified as a single star with a brown dwarf companion. ...

    • Chemodynamics of the Milky Way I. The first year of APOGEE data 

      Anders, Friedrich; Chiappini, C.C.M.; Santiago, Basilio Xavier; Rocha-Pinto, H.J.; Girardi, Leo Alberto; Costa, Luiz N. da; Maia, Marcio Antonio Geimba; Steinmetz, M.; Minchev, Ivan; Schultheis, Mathias; Boeche, Corrado; Miglio, Andrea; Montalbán, Josefina; Schneider, D.P.; Beers, T.C.; Cunha, Katia; Allende Prieto, Carlos; Balbinot, Eduardo; Bizyaev, D.; Brauer, Dorothée; Brinkmann, Jon; Frinchaboy, P.M.; García Pérez, Ana Elia; Hayden, Michael; Hearty, Frederick R.; Holtzman, J.A.; Johnson, J.A.; Kinemuchi, Karen; Majewski, Steven Raymond; Malanushenko, E.; Malanushenko, V.; Nidever, D.L.; O'Connell, Robert West; Pan, K.; Robin, A.C.; Schiavon, Ricardo P.; Shetrone, M.; Skrutskie, M.F.; Smith, Verne V.; Stassun, Keivan G.; Zasowski, G. (2014) [Journal article]
      Context. The Apache Point Observatory Galactic Evolution Experiment (APOGEE) features the first multi-object high-resolution fiber spectrograph in the near-infrared ever built, thus making the survey unique in its capabilities: ...

    • Determining star formation rates in active galactic nuclei hosts via stellar population synthesis 

      Riffel, Rogério; Mallmann, Nícolas Dullius; Ilha, Gabriele da Silva; Storchi-Bergmann, Thaisa; Riffel, Rogemar André; Rembold, Sandro Barboza; Bizyaev, D.; Nascimento, Janaina Correa do; Schimoia, Jáderson da Silva; Costa, Luiz N. da; Boardman, Nicholas Fraser; Boquien, Médéric; Couto, Guilherme dos Santos (2021) [Journal article]
      The effect of active galactic nuclei (AGNs) feedback on the host galaxy, and its role in quenching or enhancing star formation, is still uncertain due to the fact that usual star formation rate (SFR) indicators – emission-line ...

    • Exploring the brown dwarf desert : new substellar companions from the SDSS-III MARVELS survey 

      Grieves, Nolan; Ge, Jian; Thomas, N.; Ma, Bo; Sithajan, Sirinrat; Ghezzi, Luan; Kimock, Benjamin; Willis, Kevin; De Lee, Nathan M.; Lee, Brian L.; Fleming, S.W.; Agol, Eric; Troup, Nicholas W.; Paegert, Martin; Schneider, D.P.; Stassun, Keivan G.; Városi, Frank; Zhao, Bo; Liu, Jian; Li, Rui; Mello, Gustavo Frederico Porto de; Bizyaev, D.; Pan, K.; Ferreira, Letícia D.; Lorenzo-Oliveira, Diego; Santiago, Basilio Xavier; Costa, Luiz N. da; Maia, Marcio Antonio Geimba; Ogando, Ricardo L.C.; Del Peloso, Eduardo Fernandez (2017) [Journal article]
      Planet searches using the radial velocity technique show a paucity of companions to solar-type stars within ∼5 au in the mass range of ∼10–80 MJup. This deficit, known as the brown dwarf desert, currently has no conclusive ...

    • Ionised gas kinematics in MaNGA AGNIonised gas kinematics in MaNGA AGN : extents of the narrow-line and kinematically disturbed regions 

      Machado, Alice Deconto; Riffel, Rogemar André; Ilha, Gabriele da Silva; Rembold, Sandro Barboza; Storchi-Bergmann, Thaisa; Riffel, Rogério; Schimoia, Jáderson da Silva; Schneider, D.P.; Bizyaev, D.; Feng, Shuai; Wylezalek, Dominika; Costa, Luiz N. da; Nascimento, Janaina Correa do; Maia, Marcio Antonio Geimba (2022) [Journal article]
      Context. Feedback from active galactic nuclei (AGNs) in general seems to play an important role in the evolution of galaxies, although the impact of AGN winds on their host galaxies is still unknown in the absence of a ...

    • MaNGA 8313-1901 : gas accretion observed in a blue compact dwarf galaxy 

      Ju, Mengting; Yin, Jun; Liu, Rongrong; Hao, Lei; Shao, Zhengyi; Feng, Shuai; Riffel, Rogério; Liu, Chenxu; Stark, David V.; Shen, Shiyin; Telles, Jose Eduardo; Fernández-Trincado, José Gregorio; Wang, Junfeng; Xu, Haiguang; Bizyaev, D.; Rong, Yu (2022) [Journal article]
      Gas accretion is an important process in the evolution of galaxies, but it has limited direct observational evidences. In this paper, we report the detection of a possible ongoing gas accretion event in a blue compact dwarf ...

    • Mildly suppressed star formation in central regions of MaNGA Seyfert galaxies 

      Bing, Longji; Shi, Yong; Chen, Yanmei; Sánchez, Sebastián F.; Maiolino, Roberto; Riffel, Rogério; Riffel, Rogemar André; Wylezalek, Dominika; Bizyaev, D.; Pan, K.; Drory, Niv (2019) [Journal article]
      Negative feedback from accretion on to supermassive black holes (SMBHs), that is to remove gas and suppress star formation in galaxies, has been widely suggested. However, for Seyfert galaxies which harbour less active, ...

    • Post-starburst galaxies in SDSS-IV MaNGA 

      Chen, Yanmei; Shi, Yong; Wild, Vivienne; Tremonti, Christy A.; Rowlands, Kate; Bizyaev, D.; Yan, Renbin; Lin, Lihwai; Riffel, Rogério (2019) [Journal article]
      Post-starburst galaxies, identified by their unusually strong Balmer absorption lines and weaker than average emission lines, have traditionally been selected based on their central stellar populations. Here we identify ...

    • SDSS-III : massive spectroscopic surveys of the distant universe, the Milk Way, and extra-solar planetary systems 

      Eisenstein, Daniel, J.; Weinberg, D.H.; Agol, Eric; Aihara, H.; Allende Prieto, Carlos; Anderson, S.F.; Arns, James A.; Aubourg, Éric; Bailey, Stephen; Balbinot, Eduardo; Barkhouser, Robert; Beers, T.C.; Berlind, Andreas A.; Bickerton, S.J.; Bizyaev, D.; Blanton, M.R.; Bochanski, J.J.; Bolton, Adam S.; Bosman, Casey T.; Bovy, Jo; Brandt, W.N.; Breslauer, Ben; Brewington, Howard J.; Brinkmann, Jon; Brown, Peter J.; Brownstein, Joel R.; Burger, Dan; Busca, Nicolas G.; Campbell, Heather; Cargile, Phillip A.; Carithers, William C.; Carlberg, J.K.; Carr, M.A.; Chang, Liang; Chen, Yanmei; Chiappini, C.C.M.; Comparat, Johan; Connolly, Natalia; Cortes, Marina; Croft, Rupert A.C.; Cunha, Katia; Costa, Luiz N. da; Davenport, J.R.A.; Dawson, K.S.; De Lee, Nathan M.; Mello, Gustavo Frederico Porto de; De Simoni, Fernando S.; Dean, Janice; Dhital, S.; Ealet, Anne; Ebelke, Garrett L.; Edmondson, E.M.; Eiting, J.M.; Escoffier, Stephanie; Esposito, Massimiliano; Evans, M.L.; Fan, Xiaohui; Femenía Castellá, B.; Ferreira, Letícia D.; Fitzgerald, Greg; Fleming, S.W.; Font-Ribera, A.; Ford, Eric B.; Frinchaboy, P.M.; García Pérez, Ana Elia; Gaudi, B. S.; Ge, Jian; Ghezzi, Luan; Gillespie, Bruce A.; Gilmore, Gerry; Girardi, Leo Alberto; Gott, J. Richard; Gould, Andrew; Grebel, Eva K.; Gunn, James E.; Hamilton, J.C.; Harding, Paul; Harris, D.W.; Hawley, Suzanne L.; Hearty, Frederick R.; Hennawi, J.F.; González Hernández, Jonay I.; Ho, Shirley; Hogg, D.W.; Holtzman, J.A.; Honscheid, K.; Inada, Naohisa; Ivans, Inese I.; Jiang, L.; Jiang, Peng; Johnson, J.A.; Jordan, Cathy; Jordan, W.P.; Kauffmann, Guinevere; Kazin, Eyal A.; Kirkby, David; Klaene, Mark A.; Knapp, G. R.; Kneib, J.P.; Kochanek, C.S.; Koesterke, L.; Kollmeier, Juna A.; Kron, Richard G.; Lampeitl, Hubert; Lang, Dustin; Lawler, J.E.; Le Goff, Jean-Marc; Lee, B.L.; Lee, Y.S.; Leisenring, J.M.; Lin, Y.-T.; Liu, Jian; Long, Daniel C.; Loomis, Craig P.; Lucatello, Sara; Lundgren, B.; Lupton, R.H.; Ma, Bo; Ma, Zhibo; Macdonald, Nicholas; Mack, C. E.; Mahadevan, Suvrath; Maia, Marcio Antonio Geimba; Majewski, Steven Raymond; Makler, Martín; Malanushenko, E.; Malanushenko, V.; Mandelbaum, Rachel; Maraston, Claudia; Margala, D.; Maseman, P.A.; Masters, K.L.; McBride, Cameron K.; McDonald, Patrick; McGreer, Ian D.; McMahon, Richard G.; Mena Requejo, Olga; Ménard, Brice; Miralda-Escudé, J.; Morrison, H.L.; Mullally, Fergal; Muna, Demitri; Murayama, H.; Myers, A.D.; Naugle, Tracy; Fausti Neto, Angelo; Nguyen, D.C.; Nichol, Robert C.; Nidever, D.L.; O'Connell, Robert West; Ogando, Ricardo L.C.; Olmstead, Matthew D.; Oravetz, Daniel J.; Padmanabhan, N.; Paegert, Martin; Palanque-Delabrouille, Nathalie; Pan, K.; Pandey, Parul; Parejko, J.K.; Pâris, Isabelle; Pellegrini, Paulo Sérgio de Souza; Pepper, J.; Percival, Will J.; Petitjean, P.; Pfaffenberger, Robert; Pforr, J.; Phleps, Stefanie; Pichon, C,; Pieri, Matthew M.; Prada, F.; Price-Whelan, Adrian M.; Raddick, M. Jordan; Ramos, Beatriz H.F.; Reid, I. Neill; Reylé, Céline; Rich, J.; Richards, G.T.; Rieke, G.H.; Rieke, M.J.; Rix, H.-W.; Robin, A.C.; Rocha-Pinto, H.J.; Rockosi, C.M.; Roe, Natalie A.; Rollinde, Emmanuel; Ross, A.J.; Ross, Nicholas P.; Rossetto, Bruno M.; Sánchez, Ariel G.; Santiago, Basilio Xavier; Sayres, Conor; Schiavon, Ricardo P.; Schlegel, David J.; Schlesinger, K.J.; Schmidt, Sarah. J.; Schneider, D.P.; Sellgren, K.; Bradley, Alaina C. Shelden; Sheldon, Erin; Shetrone, M.; Shu, Yiping; Silverman, J.D.; Simmerer, Jennifer; Simmons, Audrey E.; Sivarani, Thirupathi; Skrutskie, M.F.; Slosar, A.; Smee, Stephen; Smith, Verne V.; Snedden, S.A.; Stassun, Keivan G.; Steele, Oliver; Steinmetz, M.; Stockett, Mark H.; Stollberg, Todd; Strauss, Michael A.; Szalay, A.S.; Tanaka, M.; Thakar, Aniruddha; Thomas, D.; Tinker, Jeremy; Tofflemire, Benjamin M.; Tojeiro, R.; Tremonti, Christy A.; Vargas Magaña, Mariana; Verde, Licia; Vogt, N.P.; Wake, D.A.; Wan, Xiaoke; Wang, Ji; Weaver, Benjamin A.; White, M.; White, Simon D. M.; Wilson, J.C.; Wisniewski, J.P.; Wood-Vasey, W.M.; Yanny, Brian; Yasuda, Naoki; Yèche, Christophe; York, Donald G.; Young, E.; Zasowski, G.; Zehavi, I.; Zhao, Bo (2011) [Journal article]
      Building on the legacy of the Sloan Digital Sky Survey (SDSS-I and II), SDSS-III is a program of four spectroscopic surveys on three scientific themes: dark energy and cosmological parameters, the history and structure of ...

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

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

    • SDSS-IV MaNGA : inside-out versus outside-in quenching of galaxies in different local environments 

      Lin, Lihwai; Hsieh, Bauching; Pan, Hsi An; Rembold, Sandro Barboza; Sánchez, Sebastián F.; Argudo-Fernández, Maria; Rowlands, Kate; Belfiore, Francesco; Bizyaev, D.; Lacerna, Ivan; Riffel, Rogério; Rong, Yu; Yuan, Fang; Drory, Niv; Maiolino, Roberto; Wilcots, Eric (2019) [Journal article]
      The large Integral Field Spectroscopy surveys have allowed the classification of ionizing sources of emission lines on sub-kiloparsec scales. In this work, we define two non-parametric parameters, quiescence (Fq) and its ...

    • SDSS IV MaNGA : metallicity and ionisation parameter in local star-forming galaxies from Bayesian fitting to photoionisation models 

      Mingozzi, Matilde; Belfiore, Francesco; Cresci, Giovanni; Bundy, Kevin; Bershady, Matthew A.; Bizyaev, D.; Blanc, Guillermo A.; Boquien, Médéric; Drory, Niv; Fu, Hai; Maiolino, Roberto; Riffel, Rogério; Rosario, David; Schaefer, Adam L.; Storchi-Bergmann, Thaisa; Telles, Jose Eduardo; Tremonti, Christy A.; Zakamska, Nadia L.; Zhang, Kai (2020) [Journal article]
      We measured gas-phase metallicity, ionisation parameter, and dust extinction for a representative sample of 1795 local star-forming galaxies using integral field spectroscopy from the SDSS-IV MaNGA survey. We self-consistently ...

    • SDSS-IV MaNGA : properties of galaxies with kinematically decoupled stellar and gaseous components 

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

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

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

    • SDSS-IV MaNGA : spatially resolved star formation main sequence and LI(N)ER sequence 

      Hsieh, Bauching; Lin, Lihwai; Lin, Jing Hua; Pan, Hsi An; Hsu, Chin Hao; Sánchez, Sebastián F.; Cano-Díaz, Mariana; Zhang, Kai; Yan, Renbin; Barrera-Ballesteros, Jorge; Boquien, Médéric; Riffel, Rogério; Brownstein, Joel R.; Cruz-Gonzalez, Irene; Hagen, Alex; Ibarra, H.; Pan, K.; Bizyaev, D.; Oravetz, Daniel J.; Simmons, Audrey E. (2017) [Journal article]
      We present our study on the spatially resolved Hαand M*relation for 536 star-forming and 424 quiescent galaxies taken from the MaNGA survey. We show that the star formation rate surface density (SSFR), derived based on ...

    • SDSS IV MaNGA : star-formation driven biconical outflows in face-on galaxies 

      Bizyaev, D.; Chen, Yan-Mei; Shi, Yong; Roy, Namrata; Riffel, Rogério; Riffel, Rogemar André; Fernández-Trincado, José Gregorio (2022) [Journal article]
      We find 132 face-on and low inclination galaxies with central star formation driven biconical gas outflows (FSFB) in the SDSS MaNGA (Mapping Nearby Galaxies at APO) survey. The FSFB galaxies show either double peaked or ...

    • SDSS-IV MaNGA : star-formation-driven biconical outflows in the local universe 

      Bizyaev, D.; Chen, Yanmei; Shi, Yong; Riffel, Rogemar André; Riffel, Rogério; Diamond-Stanic, Aleksandar M.; Roy, Namrata (2019) [Journal article]
      We present a sample of 48 nearby galaxies with central, biconical outflows identified by the Mapping Nearby Galaxies at APO survey. All considered galaxies have star-formation-driven biconical (SFB) central outflows, with ...

    • SDSS-IV MaNGA : stellar population gradients as a function of galaxy environment 

      Goddard, Daniel; Thomas, D.; Maraston, Claudia; Westfall, Kyle B.; Etherington, James; Riffel, Rogério; Mallmann, Nícolas Dullius; Zheng, Zheng; Argudo-Fernández, Maria; Bershady, Matthew A.; Bundy, Kevin; Drory, Niv; Law, David R.; Yan, Renbin; Wake, D.A.; Weijmans, Anne Marie; Bizyaev, D.; Brownstein, Joel R.; Lane, Richard R.; Maiolino, Roberto; Masters, K.L.; Merrifield, Michael; Nitschelm, Christian; Pan, K.; Roman-Lopes, Alexandre; Storchi-Bergmann, Thaisa (2017) [Journal article]
      We study the internal radial gradients of stellar population properties within 1.5 Re and analyse the impact of galaxy environment.We use a representative sample of 721 galaxies with masses ranging between 109M and 1011.5M ...

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

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

    • Sloan Digital Sky Survey IV : mapping the Milky Way, nearby galaxies, and the distant universe 

      Blanton, M.R.; Bershady, Matthew A.; Abolfathi, Bela; Albareti, Franco D.; Allende Prieto, Carlos; Almeida, Andres; Alonso Garcia, Javier; Anders, Friedrich; Anderson, Scott F.; Andrews, Brett H.; Aquino-Ortíz, Erik; Aragón-Salamanca, Alfonso; Argudo-Fernández, Maria; Armengaud, Eric; Aubourg, Éric; Avila-Reese, Vladimir; Badenes, Carles; Bailey, Stephen; Barger, Kathleen A.; Barrera-Ballesteros, Jorge; Bartosz, Curtis; Bates, Dominic; Baumgarten, Falk; Bautista, Julian; Beaton, Rachael Lynn; Beers, T.C.; Belfiore, Francesco; Bender, Chad Frederick; Berlind, Andreas A.; Bernardi, Mariangela; Beutler, Florian; Bird, Jonathan C.; Bizyaev, D.; Blanc, Guillermo A.; Blomqvist, Michael C.; Bolton, Adam S.; Boquien, Médéric; Borissova, Jura; Bosch, Remco van den; Bovy, Jo; Brandt, W.N.; Brinkmann, Jon; Brownstein, Joel R.; Bundy, Kevin; Burgasser, Adam J.; Burtin, Etienne; Busca, Nicolas G.; Cappellari, Michele; Carigi, Leticia; Carlberg, J.K.; Carnero Rosell, Aurelio; Carrera, Ricardo; Chanover, Nancy J.; Cherinka, Brian; Cheung, Edmond; Chew, Yilen Gómez Maqueo; Chiappini, C.C.M.; Choi, Peter Doohyun; Chojnowski, Stephen Drew; Chuang, Chia-Hsun; Chung, Haeun; Cirolini, Rafael Fernando; Clerc, Nicolas; Cohen, Roger; Comparat, Johan; Costa, Luiz N. da; Cousinou, Marie-Claude; Covey, Kevin; Crane, Jeffrey D.; Croft, Rupert A.C.; Cruz-Gonzalez, Irene; Cuadra, Daniel Garrido; Cunha, Katia; Damke, Guillermo J.; Darling, Jeremy; Davies, Roger L.; Dawson, K.S.; Macorra, Axel de la; Dell'Agli, Flavia; De Lee, Nathan M.; Delubac, Timothée; Di Mille, Francesco; Diamond-Stanic, Aleksandar M.; Cano-Díaz, Mariana; Donor, John; Downes Wallace, Juan Jose; Drory, Niv; Du Mas Des Bourboux, Hélion; Duckworth, Christopher; Dwelly, Tom; Dyer, Jamie Christine; Ebelke, Garrett L.; Eigenbrot, Arthur D.; Eisenstein, Daniel, J.; Emsellem, Eric; Eracleous, Michael; Escoffier, Stephanie; Evans, Michael L.; Fan, Xiaohui; Fernández Alvar, Emma; Fernández-Trincado, José Gregorio; Feuillet, Diane; Finoguenov, Alexis; Fleming, S.W.; Font-Ribera, A.; Fredrickson, Alexander; Freischlad, Gordon; Frinchaboy, P.M.; Fuentes, Carla E.; Galbany, Lluís; Dias, Rafael Augusto Garcia; García-Hernández, D. A.; Gaulme, Patrick; Geisler, Doug; Gelfand, Joseph D.; Gil-Marín, Héctor; Gillespie, Bruce A.; Goddard, Daniel; Gonzalez-Perez, Violeta; Grabowski, Kathleen; Green, Paul J.; Grier, Catherine J.; Gunn, James E.; Guo, Hong; Guy, Julien; Hagen, Alex; Hahn, ChangHoon; Hall, Matthew; Harding, Paul; Hasselquist, Sten; Hawley, Suzanne L.; Hearty, Frederick R.; González Hernández, Jonay I.; Ho, Shirley; Hogg, D.W.; Holley-Bockelmann, Kelly; Holtzman, J.A.; Holzer, Parker H.; Huehnerhoff, Joseph; Hutchinson, Timothy A.; Hwang, Ho Seong; Ibarra Medel, Hector Javier; Ilha, Gabriele da Silva; Ivans, Inese I.; Ivory, KeShawn; Jackson, Kelly M.; Jensen, Trey W.; Johnson, Jennifer A.; Jones, Amy P.; Jönsson, Henrik; Jullo, Eric; Kamble, Vikrant Anand; Kinemuchi, Karen; Kirkby, David; Kitaura, Francisco-Shu; Klaene, Mark A.; Knapp, G. R.; Kneib, J.P.; Kollmeier, Juna A.; Lacerna, Ivan; Lane, Richard R.; Lang, Dustin; Law, David R.; Lazarz, Daniel; Lee, Youngbae; Le Goff, Jean-Marc; Liang, Fu-Heng; Li, Cheng; Li, Hongyu; Lian, Jianhui; Lima, Marcos Vinicius Borges Teixeira; Lin, Lihwai; Lin, Y.-T.; Lis, Sara Bertran de; Lizaola, Miguel Angel C. de Icaza; Long, Daniel C.; Lucatello, Sara; Lundgren, B.; Macdonald, Nicholas; Machado, Alice Deconto; MacLeod, Chelsea L.; Mahadevan, Suvrath; Maia, Marcio Antonio Geimba; Maiolino, Roberto; Majewski, Steven Raymond; Malanushenko, E.; Malanushenko, V.; Manchado, Arturo; Mao, Shude; Maraston, Claudia; Marques-Chaves, Rui; Masseron, Thomas; Masters, K.L.; McBride, Cameron K.; McDermid, Richard; McGrath, Brianne; McGreer, Ian D.; Medina Peña, Nicolás; Melendez, Matthew; Merloni, Andrea; Merrifield, Michael; Mészáros, S.; Meza, Andres; Minchev, Ivan; Minniti, Dante; Miyaji, Takamitsu; More, Surhud Shrikant; Mulchaey, John Scott; Muller-Sanchez, Francisco; Muna, Demitri; Mũñoz, Ricardo R.; Myers, A.D.; Nair, Preethi B.; Nandra, Kirpal; Nascimento, Janaina Correa do; Negrete, Alenka; Ness, Melissa; Newman, Jeffrey A.; Nichol, Robert C.; Nidever, D.L.; Nitschelm, Christian; Ntelis, Pierros; O'Connell, Julia E.; Oelkers, Ryan J.; Oravetz, Audrey; Oravetz, Daniel J.; Pace, Zach; Padilla, Nelson; Palanque-Delabrouille, Nathalie; Alonso Palicio, Pedro; Pan, K.; Parejko, J.K.; Parikh, Taniya; Pâris, Isabelle; Park, Changbom; Patten, Alim Y.; Peirani, Sébastien; Pellejero-Ibanez, Marcos; Penny, Samantha J.; Percival, Will J.; Pérez-Fournon, Ismael; Petitjean, P.; Pieri, Matthew M.; Pinsonneault, Marc H.; Pisani, Alice; Poleski, Radosław; Prada, Francisco; Prakash, Abhishek; Queiroz, Anna Bárbara de Andrade; Raddick, M. 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      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 ...