1. OzDES multifibre spectroscopy for the Dark Energy Survey: 3-yr results and first data release
- Author
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D. Mudd, V. Scarpine, M. E. C. Swanson, R. R. Gupta, John Marriner, Tim Eifler, F. J. Castander, Peter Doel, Mark Sullivan, Edward Macaulay, A. G. Kim, Eve Kovacs, B. Flaugher, M. Smith, I. Sevilla-Noarbe, N. E. Sommer, Daniel Gruen, C. Lidman, Ramon Miquel, T. M. C. Abbott, Jeremy Mould, Geraint F. Lewis, Michael Schubnell, Samuel Hinton, S. A. Uddin, R. L. C. Ogando, A. Benoit-Lévy, N. Kuropatkin, Rob Sharp, M. Sako, G. Gutierrez, M. Childress, David J. James, Stephanie R. Bernard, Juan Garcia-Bellido, L. N. da Costa, David Brooks, Pablo Fosalba, M. A. G. Maia, E. Buckley-Geer, Fang Yuan, Flavia Sobreira, M. Carrasco Kind, Robert C. Nichol, Richard Kessler, J. Annis, Karl Glazebrook, A. A. Plazas, Alistair R. Walker, Ryan J. Foley, Nick Seymour, F. Ostrovski, M. Banerji, Joshua A. Frieman, Marcelle Soares-Santos, M. March, Huan Lin, Jennifer L. Marshall, Brad E. Tucker, E. Suchyta, August E. Evrard, G. Tarle, Rafe Schindler, Anais Möller, E. Bertin, Kevin Reil, Kyler Kuehn, W. C. Wester, S. L. Reed, Tianjun Li, Marcos Lima, D. L. Burke, Daniel Scolnic, Daniela Carollo, David Parkinson, H. M. Spinka, Eric Morganson, S. Allam, Robert A. Gruendl, J. Gschwend, Brian Nord, D. Lagattuta, Jacobo Asorey, J. K. Hoormann, C. B. D'Andrea, A. K. Romer, S. E. Kuhlmann, Paul Martini, F. B. Abdalla, Bonnie Zhang, J. Carretero, Tamara M. Davis, Daniel A. Goldstein, Richard G. McMahon, Eli S. Rykoff, E. J. Sanchez, A. L. King, Carlos E. Cunha, A. Carnero Rosell, Felipe Menanteau, Daniel Muthukrishna, 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), 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), DES, 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), 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 ), Institut de Physique Nucléaire de Lyon ( IPNL ), Université Claude Bernard Lyon 1 ( UCBL ), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS )
- Subjects
[ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph] ,AST-1138766 ,Astrophysics ,Astrophysics::Cosmology and Extragalactic Astrophysics ,01 natural sciences ,law.invention ,Telescope ,law ,0103 physical sciences ,Astrophysics::Solar and Stellar Astrophysics ,dark energy ,010303 astronomy & astrophysics ,Spectrograph ,STFC ,Astrophysics::Galaxy Astrophysics ,Physics ,010308 nuclear & particles physics ,RCUK ,Astronomy ,Astronomy and Astrophysics ,Quasar ,supernovae: general – dark energy ,Redshift ,Galaxy ,Supernova ,13. Climate action ,Space and Planetary Science ,Magnitude (astronomy) ,Dark energy ,[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] ,general [supernovae] ,uploaded-in-3-months-elsewhere - Abstract
International audience; We present results for the first three years of OzDES, a six year programme to obtain redshifts for objects in the Dark Energy Survey (DES) supernova fields using the 2dF fibre positioner and AAOmega spectrograph on the Anglo-Australian Telescope. OzDES is a multi-object spectroscopic survey targeting multiple types of targets at multiple epochs over a multiyear baseline and is one of the first multi-object spectroscopic surveys to dynamically include transients into the target list soon after their discovery. At the end of three years, OzDES has spectroscopically confirmed almost 100 supernovae, and has measured redshifts for 17 000 objects, including the redshifts of 2566 supernova hosts. We examine how our ability to measure redshifts for targets of various types depends on signal-to-noise ratio (S/N), magnitude and exposure time, finding that our redshift success rate increases significantly at a S/N of 2–3 per 1-Å bin. We also find that the change in S/N with exposure time closely matches the Poisson limit for stacked exposures as long as 10 h. We use these results to predict the redshift yield of the full OzDES survey, as well as the potential yields of future surveys on other facilities such as (i.e. the 4-m Multi-Object Spectroscopic Telescope, the Subaru Prime Focus Spectrograph and the Maunakea Spectroscopic Explorer). This work marks the first OzDES data release, comprising 14 693 redshifts. OzDES is on target to obtain over 30 000 redshifts over the 6-yr duration of the survey, including a yield of approximately 5700 supernova host-galaxy redshifts.
- Published
- 2017
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