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151. Dark Energy Survey Year 1 Results: Methodology and Projections for Joint Analysis of Galaxy Clustering, Galaxy Lensing, and CMB Lensing Two-point Functions

Author

E. Bertin, Jochen Weller, C. Davis, Joshua A. Frieman, F. J. Castander, Erin Sheldon, I. Sevilla-Noarbe, N. Kuropatkin, L. N. da Costa, S. Pandey, S. Samuroff, T. M. C. Abbott, M. E. C. Swanson, E. J. Sanchez, J. Gschwend, R. C. Smith, Jonathan Blazek, A. A. Plazas, Mathew Smith, G. Tarle, Scott Dodelson, Santiago Avila, T. M. Crawford, Chihway Chang, Carles Sanchez, Juan Estrada, Carlos E. Cunha, B. Flaugher, Enrique Gaztanaga, Peter Doel, Michael Schubnell, David J. James, H. T. Diehl, Pablo Fosalba, David J. Brooks, Joe Zuntz, Christian L. Reichardt, W. L. K. Wu, Niall MacCrann, Filipe B. Abdalla, Kyler Kuehn, J. Prat, Lindsey Bleem, A. Roodman, Tommaso Giannantonio, Bhuvnesh Jain, G. Gutierrez, Donnacha Kirk, Alistair R. Walker, Marcelle Soares-Santos, Jennifer L. Marshall, E. Suchyta, August E. Evrard, J. Carretero, Gilbert Holder, Y. Omori, O. Friedrich, Michael Troxel, J. Annis, D. L. Hollowood, Andrina Nicola, Ramon Miquel, R. Cawthon, E. Buckley-Geer, Daniel Gruen, Marcos Lima, D. W. Gerdes, M. A. G. Maia, Ofer Lahav, Matt J. Jarvis, Tim Eifler, Steve Kent, J. De Vicente, Flavia Sobreira, M. March, D. L. Burke, Juan Garcia-Bellido, Robert A. Gruendl, M. Carrasco Kind, Bradford Benson, Ben Hoyle, Elisabeth Krause, Peter Melchior, K. Bechtol, Eli S. Rykoff, R. H. Schindler, Eric J. Baxter, L. F. Secco, A. Carnero Rosell, C. B. D'Andrea, Felipe Menanteau, A. Choi, Darren L. DePoy, W. G. Hartley, UAM. Departamento de Física Teórica, 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, 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
bias, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Physics and Astronomy (miscellaneous), MATÉRIA ESCURA, [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], Cosmic microwave background, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Cosmology, efficient, Gravitation, symbols.namesake, 0103 physical sciences, luminosity, Planck, 010306 general physics, STFC, Physics, 010308 nuclear & particles physics, Astrophysics::Instrumentation and Methods for Astrophysics, RCUK, Física, alignments, cross-correlation, dependence, Galaxy, halo model, Gravitational lens, South Pole Telescope, symbols, Dark energy, astro-ph.CO, constraints, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], cosmic shear, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Optical imaging surveys measure both the galaxy density and the gravitational lensing-induced shear fields across the sky. Recently, the Dark Energy Survey (DES) collaboration used a joint fit to two-point correlations between these observables to place tight constraints on cosmology (DES Collaboration et al. 2017). In this work, we develop the methodology to extend the DES year one joint probes analysis to include cross-correlations of the optical survey observables with gravitational lensing of the cosmic microwave background (CMB) as measured by the South Pole Telescope (SPT) and Planck. Using simulated analyses, we show how the resulting set of five two-point functions increases the robustness of the cosmological constraints to systematic errors in galaxy lensing shear calibration. Additionally, we show that contamination of the SPT+Planck CMB lensing map by the thermal Sunyaev-Zel'dovich effect is a potentially large source of systematic error for two-point function analyses, but show that it can be reduced to acceptable levels in our analysis by masking clusters of galaxies and imposing angular scale cuts on the two-point functions. The methodology developed here will be applied to the analysis of data from the DES, the SPT, and Planck in a companion work., Comment: 21 pages, 11 figures; matches version resubmitted to journal

152. Dark Energy Survey Year 1 Results: Calibration of redMaGiC Redshift Distributions in DES and SDSS from Cross-Correlations

Author

Ricardo L. C. Ogando, R. A. Bernstein, Ben Hoyle, C. Davis, V. Scarpine, R. Cawthon, J. Gschwend, A. Roodman, Tommaso Giannantonio, Daniel Thomas, J. Carretero, Elisabeth Krause, M. Carrasco Kind, R. C. Smith, Alex Drlica-Wagner, M. A. G. Maia, F. J. Castander, M. E. C. Swanson, Paul Martini, David J. Brooks, T. M. C. Abbott, J. Annis, M. Gatti, I. Sevilla-Noarbe, E. J. Sanchez, Eli S. Rykoff, A. A. Plazas, Juan Garcia-Bellido, N. Kuropatkin, Alistair R. Walker, E. Suchyta, Jack Elvin-Poole, G. Gutierrez, August E. Evrard, Filipe B. Abdalla, Marcelle Soares-Santos, Eduardo Rozo, Jennifer L. Marshall, Santiago Avila, C. Bonnett, Chihway Chang, L. N. da Costa, Carlos E. Cunha, Enrique Gaztanaga, C. B. D'Andrea, S. E. Kuhlmann, Risa H. Wechsler, Rafe Schindler, J. DeRose, D. L. Hollowood, Michael Schubnell, Ramon Miquel, Michael Troxel, Darren L. DePoy, Marcos Lima, M. Banerji, Joshua A. Frieman, W. G. Hartley, P. Vielzeuf, Tim Eifler, Douglas L. Tucker, A. Carnero Rosell, Kyler Kuehn, B. Flaugher, Ofer Lahav, Felipe Menanteau, K. Honscheid, Gary Bernstein, Huan Lin, J. De Vicente, Flavia Sobreira, Erin Sheldon, D. L. Burke, S. Allam, Robert A. Gruendl, Ashley J. Ross, G. Tarle, Tesla E. Jeltema, Shantanu Desai, Mathew Smith, A. Alarcon, David J. James, Pablo Fosalba, Peter Doel, H. T. Diehl, E. Bertin, Keith Bechtol, C. J. Miller, Daniel Gruen, D. W. Gerdes, Markus Michael Rau, Banerji, Manda [0000-0002-0639-5141], Apollo - University of Cambridge Repository, 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), and DES

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), media_common.quotation_subject, AST-1138766, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, surveys, 0103 physical sciences, Calibration, AST-1536171, 010303 astronomy & astrophysics, STFC, Astrophysics::Galaxy Astrophysics, Photometric redshift, media_common, Physics, 010308 nuclear & particles physics, Oscillation, Astrophysics::Instrumentation and Methods for Astrophysics, RCUK, Astronomy and Astrophysics, Galaxy, Redshift, Baryon, Space and Planetary Science, Sky, Dark energy, large-scale structure of Universe, galaxies: distances and redshifts, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], uploaded-in-3-months-elsewhere, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We present calibrations of the redshift distributions of redMaGiC galaxies in the Dark Energy Survey Year 1 (DES Y1) and Sloan Digital Sky Survey (SDSS) DR8 data. These results determine the priors of the redshift distribution of redMaGiC galaxies, which were used for galaxy clustering measurements and as lenses for galaxy-galaxy lensing measurements in DES Y1 cosmological analyses. We empirically determine the bias in redMaGiC photometric redshift estimates using angular cross-correlations with Baryon Oscillation Spectroscopic Survey (BOSS) galaxies. For DES, we calibrate a single parameter redshift bias in three photometric redshift bins: $z \in[0.15,0.3]$, [0.3,0.45], and [0.45,0.6]. Our best fit results in each bin give photometric redshift biases of $|\Delta z, Comment: 18 pages, 12 figures. Minor changes to text to match version accepted by MNRAS

153. Cross-correlation of gravitational lensing from DES Science Verification data with SPT and Planck lensing

Author

Martin Crocce, P. Martini, Daniel Gruen, Risa H. Wechsler, Joaquin Vieira, D. W. Gerdes, M. Sako, Andrina Nicola, David J. James, A. Benoit-Lévy, Gilbert Holder, Eli S. Rykoff, Pablo Fosalba, Gary Bernstein, C. J. Miller, Matthew R. Becker, Flavia Sobreira, A. Roodman, Marcos Lima, Tommaso Giannantonio, R. L. C. Ogando, V. Scarpine, Ramon Miquel, G. Simard, A. Carnero Rosell, M. March, Eduardo Rozo, David Brooks, M. E. C. Swanson, C. Bonnett, Adam Amara, K. Honscheid, Shantanu Desai, I. Sevilla-Noarbe, E. Suchyta, August E. Evrard, N. Kuropatkin, Alexandre Refregier, B. Flaugher, L. N. da Costa, E. Sheldon, Gregory Tarle, Peter Doel, Steve Kent, P. Larsen, Y. Omori, F. B. Abdalla, H. T. Diehl, David Bacon, Jochen Weller, Bhuvnesh Jain, Niall MacCrann, Vinu Vikram, Josh Frieman, T. M. Crawford, Michael Schubnell, M. Carrasco Kind, Robert C. Nichol, D. L. Burke, Ofer Lahav, Christian L. Reichardt, Robert A. Gruendl, Bradford Benson, R. C. Smith, Michael Troxel, K. T. Story, Tim Eifler, T. M. C. Abbott, C. B. D'Andrea, J. Carretero, T. Kacprzak, E. J. Sanchez, Daniel A. Goldstein, Kyler Kuehn, J. P. Dietrich, Sarah Bridle, Scott Dodelson, Chihway Chang, Carlos E. Cunha, R. Cawthon, Daniel Thomas, E. Buckley-Geer, Peter Melchior, R. A. Bernstein, Joe Zuntz, Donnacha Kirk, Lindsey Bleem, Marcelle Soares-Santos, M. Jarvis, A. A. Plazas, Diego Capozzi, John E. Carlstrom, UCL, McGill Univ, Univ Paris 06, CNRS, Fermilab Natl Accelerator Lab, Univ Chicago, ETH, Univ Cambridge, Univ Portsmouth, CSIC, Univ Penn, Univ Manchester, Stanford Univ, Univ Illinois, Argonne Natl Lab, Natl Opt Astron Observ, Rhodes Univ, Carnegie Observ, Barcelona Inst Sci & Technol, SLAC Natl Accelerator Lab, Lab Interinst & Astron LIneA, Observ Nacl, Natl Ctr Supercomputing Applicat, Univ Southampton, Excellence Cluster Univ, Univ Munich, CALTECH, Univ Michigan, Univ Calif Berkeley, Max Planck Inst Extraterr Phys, Ohio State Univ, Australian Astron Observ, Universidade de São Paulo (USP), Princeton Univ, Inst Catalana Rec & Estudis Avancats, Univ Melbourne, Univ Arizona, CIEMAT, and Universidade Estadual Paulista (Unesp)

Subjects
Cosmology and Gravitation, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Cosmic microwave background, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, cosmic background radiation, 01 natural sciences, Cosmology, symbols.namesake, weak [gravitational lensing], 0103 physical sciences, data analysis [methods], Planck, 010303 astronomy & astrophysics, Weak gravitational lensing, STFC, Physics, 010308 nuclear & particles physics, RCUK, Astronomy and Astrophysics, Engineering physics, Redshift, South Pole Telescope, Gravitational lens, 13. Climate action, Space and Planetary Science, symbols, Dark energy, astro-ph.CO, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We measure the cross-correlation between weak lensing of galaxy images and of the cosmic microwave background (CMB). The effects of gravitational lensing on different sources will be correlated if the lensing is caused by the same mass fluctuations. We use galaxy shape measurements from 139 deg$^{2}$ of the Dark Energy Survey (DES) Science Verification data and overlapping CMB lensing from the South Pole Telescope (SPT) and Planck. The DES source galaxies have a median redshift of $z_{\rm med} {\sim} 0.7$, while the CMB lensing kernel is broad and peaks at $z{\sim}2$. The resulting cross-correlation is maximally sensitive to mass fluctuations at $z{\sim}0.44$. Assuming the Planck 2015 best-fit cosmology, the amplitude of the DES$\times$SPT cross-power is found to be $A = 0.88 \pm 0.30$ and that from DES$\times$Planck to be $A = 0.86 \pm 0.39$, where $A=1$ corresponds to the theoretical prediction. These are consistent with the expected signal and correspond to significances of $2.9 \sigma$ and $2.2 \sigma$ respectively. We demonstrate that our results are robust to a number of important systematic effects including the shear measurement method, estimator choice, photometric redshift uncertainty and CMB lensing systematics. Significant intrinsic alignment of galaxy shapes would increase the cross-correlation signal inferred from the data; we calculate a value of $A = 1.08 \pm 0.36$ for DES$\times$SPT when we correct the observations with a simple IA model. With three measurements of this cross-correlation now existing in the literature, there is not yet reliable evidence for any deviation from the expected LCDM level of cross-correlation, given the size of the statistical uncertainties and the significant impact of systematic errors, particularly IAs. We provide forecasts for the expected signal-to-noise of the combination of the five-year DES survey and SPT-3G., Comment: 13 pages, 6 figures

154. Phenotypic redshifts with self-organizing maps: A novel method to characterize redshift distributions of source galaxies for weak lensing

Author

C. Davis, R. Buchs, G. Gutierrez, J. Gschwend, D. L. Hollowood, Shantanu Desai, Eli S. Rykoff, S. Serrano, Gary Bernstein, Marcelle Soares-Santos, R. Cawthon, Tim Eifler, A. Alarcon, S. W. Allen, Vinu Vikram, A. Carnero Rosell, M. A. G. Maia, G. Tarle, B. Flaugher, E. Suchyta, August E. Evrard, J. Myles, Peter Doel, David J. James, Huan Lin, Jennifer L. Marshall, H. T. Diehl, Pablo Fosalba, A. Choi, K. Honscheid, Kyler Kuehn, Keith Bechtol, Daniel Thomas, Marcos Lima, Sarah Bridle, Alexandra Amon, Juan Garcia-Bellido, M. Smith, E. Buckley-Geer, V. Scarpine, Ramon Miquel, Santiago Avila, M. Carrasco Kind, J. Carretero, M. E. C. Swanson, Daniel Gruen, Alex Drlica-Wagner, Felipe Menanteau, A. Roodman, D. L. Burke, David J. Brooks, Flavia Sobreira, C. Sánchez, J. Annis, F. J. Castander, Robert A. Gruendl, T. M. C. Abbott, Risa H. Wechsler, E. J. Sanchez, Enrique Gaztanaga, Joshua A. Frieman, I. Sevilla-Noarbe, N. Kuropatkin, D. Masters, L. N. da Costa, Peter Melchior, M. March, R. L. C. Ogando, Michael Troxel, J. De Vicente, C. B. D'Andrea, J. DeRose, W. G. Hartley, and A. A. Plazas

Subjects
pau survey, photometric redshifts, Cosmology and Nongalactic Astrophysics (astro-ph.CO), Hubble Deep Field, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, pdfs, 01 natural sciences, gravitational lensing: weak, 0103 physical sciences, evolution, errors, Sample variance, dark energy, 010303 astronomy & astrophysics, Weak gravitational lensing, Physics, 010308 nuclear & particles physics, Shot noise, Spectral density, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Galaxy, Redshift, colors, classification, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Dark energy, galaxies: distances and redshifts, constraints, performance, Astrophysics - Cosmology and Nongalactic Astrophysics, camera
Abstract

Wide-field imaging surveys such as the Dark Energy Survey (DES) rely on coarse measurements of spectral energy distributions in a few filters to estimate the redshift distribution of source galaxies. In this regime, sample variance, shot noise, and selection effects limit the attainable accuracy of redshift calibration and thus of cosmological constraints. We present a new method to combine wide-field, few-filter measurements with catalogs from deep fields with additional filters and sufficiently low photometric noise to break degeneracies in photometric redshifts. The multi-band deep field is used as an intermediary between wide-field observations and accurate redshifts, greatly reducing sample variance, shot noise, and selection effects. Our implementation of the method uses self-organizing maps to group galaxies into phenotypes based on their observed fluxes, and is tested using a mock DES catalog created from N-body simulations. It yields a typical uncertainty on the mean redshift in each of five tomographic bins for an idealized simulation of the DES Year 3 weak-lensing tomographic analysis of $\sigma_{\Delta z} = 0.007$, which is a 60% improvement compared to the Year 1 analysis. Although the implementation of the method is tailored to DES, its formalism can be applied to other large photometric surveys with a similar observing strategy., Comment: 24 pages, 11 figures; matches version accepted to MNRAS

155. Dark Energy Survey Year 1 Results: Weak Lensing Shape Catalogues

Author

Flavia Sobreira, S. Samuroff, Shantanu Desai, Y. Fang, Eric H. Neilsen, Martin Crocce, Mathew Smith, E. Suchyta, August E. Evrard, Peter Melchior, G. Tarle, M. D. Johnson, M. March, Enrique Fernández, Ramon Miquel, C. Sánchez, T. N. Varga, Felipe Menanteau, Matt J. Jarvis, Yanxi Zhang, David J. James, Vinu Vikram, Joshua A. Frieman, Tim Eifler, Donnacha Kirk, M. A. G. Maia, J. Prat, Alistair R. Walker, B. Soergel, I. Sevilla-Noarbe, Pablo Fosalba, Douglas L. Tucker, Kyler Kuehn, N. Kuropatkin, A. Benoit-Lévy, Marcelle Soares-Santos, F. J. Castander, G. Gutierrez, L. N. da Costa, K. Honscheid, R. C. Smith, Juan Garcia-Bellido, V. Scarpine, E. Bertin, Rafe Schindler, Ricardo L. C. Ogando, R. P. Rollins, Ofer Lahav, Ami Choi, Ben Hoyle, C. Krawiec, Michael Troxel, T. M. C. Abbott, B. Flaugher, J. Annis, Keith Bechtol, Eli S. Rykoff, D. L. Burke, Erin Sheldon, C. Davis, J. Carretero, J. P. Dietrich, Natalie A. Roe, C. J. Miller, M. E. C. Swanson, J. Gschwend, A. Carnero Rosell, S. Allam, Robert A. Gruendl, E. J. Sanchez, Gary Bernstein, Daniel Thomas, A. K. Romer, Tesla E. Jeltema, E. Buckley-Geer, Paul Martini, Daniel Gruen, A. Fausti Neto, E. M. Huff, Joe Zuntz, Alex Drlica-Wagner, Enrique Gaztanaga, D. W. Gerdes, Marvin Johnson, Filipe B. Abdalla, William G. Hartley, Bhuvnesh Jain, Peter Doel, Risa H. Wechsler, Marcos Lima, H. T. Diehl, M. Carrasco Kind, Robert C. Nichol, Niall MacCrann, C. B. D'Andrea, S. E. Kuhlmann, Tenglin Li, Sarah Bridle, Scott Dodelson, Joseph J. Mohr, T. Kacprzak, Carlos E. Cunha, A. Roodman, Tommaso Giannantonio, Juan Estrada, Michael Schubnell, A. A. Plazas, 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), and DES

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), AST-1138766, FOS: Physical sciences, techniques: image processing, Astrophysics, Astronomy & Astrophysics, Surveys, 01 natural sciences, symbols.namesake, gravitational lensing: weak, surveys, Bulge, 0103 physical sciences, image processing [Techniques], Astronomical And Space Sciences, AST-1536171, observations [Cosmology], data analysis [Methods], 010303 astronomy & astrophysics, STFC, Weak gravitational lensing, catalogues, QB, Physics, 010308 nuclear & particles physics, Multiplicative function, RCUK, Astronomy, Astronomy and Astrophysics, Catalogues, methods: data analysis, Redshift, Galaxy, South Pole Telescope, Space and Planetary Science, cosmology: observations, symbols, Dark energy, weak [Gravitational lensing], [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Gaussian network model, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We present two galaxy shape catalogues from the Dark Energy Survey Year 1 data set, covering 1500 square degrees with a median redshift of $0.59$. The catalogues cover two main fields: Stripe 82, and an area overlapping the South Pole Telescope survey region. We describe our data analysis process and in particular our shape measurement using two independent shear measurement pipelines, METACALIBRATION and IM3SHAPE. The METACALIBRATION catalogue uses a Gaussian model with an innovative internal calibration scheme, and was applied to $riz$-bands, yielding 34.8M objects. The IM3SHAPE catalogue uses a maximum-likelihood bulge/disc model calibrated using simulations, and was applied to $r$-band data, yielding 21.9M objects. Both catalogues pass a suite of null tests that demonstrate their fitness for use in weak lensing science. We estimate the 1$\sigma$ uncertainties in multiplicative shear calibration to be $0.013$ and $0.025$ for the METACALIBRATION and IM3SHAPE catalogues, respectively., Comment: 36 Pages, 29 figures. This version accepted for publication in MNRAS

156. Discovery of the Lensed Quasar System DES J0408-5354

Author

Alistair R. Walker, Juan Garcia-Bellido, H. T. Diehl, Rafe Schindler, Peter Melchior, K. Honscheid, Marcos Lima, Tommaso Treu, M. S. S. Gill, Cristian E. Rusu, D. A. Finley, D. L. Burke, F. B. Abdalla, Daniel Thomas, M. Smith, E. Buckley-Geer, Daniel Gruen, Ricardo L. C. Ogando, J. Carretero, B. Flaugher, C. B. D'Andrea, A. Benoit-Lévy, J. L. Marshall, Adriano Agnello, Tim Eifler, Daniel A. Goldstein, Anupreeta More, A. Carnero Rosell, S. Allam, Robert A. Gruendl, J. P. Dietrich, Nikolay Kuropatkin, Richard G. McMahon, Georges Meylan, D. W. Gerdes, Flavia Sobreira, James H. H. Chan, Philip J. Marshall, M. S. Schubnell, David J. James, Ramon Miquel, J. Gschwend, Pablo Fosalba, Felipe Menanteau, Thomas E. Collett, E. Suchyta, Matthew W. Auger, Martin Crocce, Francisco J. Castander, Gregory Tarle, Kyler Kuehn, M. March, A. A. Plazas, Marcio A. G. Maia, M. Banerji, Robert Connon Smith, Sherry H. Suyu, Keith Bechtol, Frederic Courbin, Shantanu Desai, Huan Lin, I. Sevilla-Noarbe, Brian Nord, Adam Amara, G. Gutierrez, D. L. Tucker, F. Ostrovski, A. K. Romer, Paul Martini, Joshua A. Frieman, L. N. da Costa, David Brooks, M. E. C. Swanson, Tenglin Li, E. Bertin, Enrique Gaztanaga, E. J. Sanchez, M. Carrasco Kind, Christopher D. Fassnacht, T. M. C. Abbott, Ofer Lahav, 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, 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
Cosmology and Gravitation, Cosmology and Nongalactic Astrophysics (astro-ph.CO), [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], astro-ph.GA, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, law.invention, Telescope, surveys, law, quasars: general, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, STFC, QB, Physics, 010308 nuclear & particles physics, RCUK, gravitational lensing: strong, Astronomy and Astrophysics, Quasar, Astrophysics - Astrophysics of Galaxies, Redshift, Galaxy, Space and Planetary Science, Astrophysics of Galaxies (astro-ph.GA), Dark energy, astro-ph.CO, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We report the discovery and spectroscopic confirmation of the quad-like lensed quasar system DES J0408-5354 found in the Dark Energy Survey (DES) Year 1 (Y1) data. This system was discovered during a search for DES Y1 strong lensing systems using a method that identified candidates as red galaxies with multiple blue neighbors. DES J0408-5354 consists of a central red galaxy surrounded by three bright (i < 20) blue objects and a fourth red object. Subsequent spectroscopic observations using the Gemini South telescope confirmed that the three blue objects are indeed the lensed images of a quasar with redshift z = 2.375, and that the central red object is an early-type lensing galaxy with redshift z = 0.597. DES J0408-5354 is the first quad lensed quasar system to be found in DES and begins to demonstrate the potential of DES to discover and dramatically increase the sample size of these very rare objects., 9 pages, 4 figures, submitted to ApJ Letters

157. Primordial non-Gaussianity with Angular correlation function: Integral constraint and validation for DES

Author

Walter Riquelme, Santiago Avila, Juan García-Bellido, Anna Porredon, Ismael Ferrero, Kwan Chuen Chan, Rogerio Rosenfeld, Hugo Camacho, Adrian G Adame, Aurelio Carnero Rosell, Martin Crocce, Juan De Vicente, Tim Eifler, Jack Elvin-Poole, Xiao Fang, Elisabeth Krause, Martin Rodriguez Monroy, Ashley J Ross, Eusebio Sanchez, and Ignacio Sevilla

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), Space and Planetary Science, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

Local primordial non-Gaussianity (PNG) is a promising observable of the underlying physics of inflation, characterised by $f_{\rm NL}^{\rm loc}$. We present the methodology to measure $f_{\rm NL}^{\rm loc}$ from the Dark Energy Survey (DES) data using the 2-point angular correlation function (ACF) with scale-dependent bias. One of the focuses of the work is the integral constraint. This condition appears when estimating the mean number density of galaxies from the data and is key in obtaining unbiased $f_{\rm NL}^{\rm loc}$ constraints. The methods are analysed for two types of simulations: $\sim 246$ GOLIAT-PNG N-body small area simulations with $f_{\rm NL}$ equal to -100 and 100, and 1952 Gaussian ICE-COLA mocks with $f_{\rm NL}=0$ that follow the DES angular and redshift distribution. We use the ensemble of GOLIAT-PNG mocks to show the importance of the integral constraint when measuring PNG, where we recover the fiducial values of $f_{\rm NL}$ within the $1\sigma$ when including the integral constraint. In contrast, we found a bias of $\Delta f_{\rm NL}\sim 100$ when not including it. For a DES-like scenario, we forecast a bias of $\Delta f_{\rm NL} \sim 23$, equivalent to $1.8\sigma$, when not using the IC for a fiducial value of $f_{\rm NL}=100$. We use the ICE-COLA mocks to validate our analysis in a realistic DES-like setup finding it robust to different analysis choices: best-fit estimator, the effect of IC, BAO damping, covariance, and scale choices. We forecast a measurement of $f_{\rm NL}$ within $\sigma(f_{\rm NL})=31$ when using the DES-Y3 BAO sample, with the ACF in the $1\ {\rm deg}, Comment: Version after MNRAS reviewer comments. Improved discussion in Section 7. 16 pages, 11 figures

158. Dark Energy Survey Year 1 Results: Cross-Correlation Redshifts - Methods and Systematics Characterization

Author

Shantanu Desai, Kevin Reil, A. Carnero Rosell, J. Carretero, Tamara M. Davis, Daniel A. Goldstein, B. Flaugher, J. Gschwend, J. DeRose, Mathew Smith, Gary Bernstein, J. Annis, A. Alarcon, Darren L. DePoy, Jacobo Asorey, Jochen Weller, F. J. Castander, Masao Sako, W. G. Hartley, Risa H. Wechsler, M. A. G. Maia, David J. James, Edward Macaulay, Alistair R. Walker, Anais Möller, Felipe Menanteau, Gregory Tarle, N. E. Sommer, Marcelle Soares-Santos, T. M. C. Abbott, M. D. Johnson, Ramon Miquel, Pablo Fosalba, R. C. Smith, M. S. Schubnell, R. C. Wolf, Geraint F. Lewis, C. R. O'Neill, Keith Bechtol, Juan Garcia-Bellido, Elisabeth Krause, Marcos Lima, C. B. D'Andrea, K. Honscheid, A. A. Plazas, Karl Glazebrook, C. Lidman, E. J. Sanchez, S. E. Kuhlmann, Eduardo Rozo, M. Gatti, R. Cawthon, Tesla E. Jeltema, A. Roodman, Niall MacCrann, I. Sevilla-Noarbe, W. C. Wester, Eli S. Rykoff, Daniel Thomas, C. Davis, Daniela Carollo, M. W.G. Johnson, Samuel Hinton, J. K. Hoormann, N. Kuropatkin, Huan Lin, Erin Sheldon, David Brooks, M. E. C. Swanson, Tenglin Li, G. Gutierrez, D. L. Burke, Michael Troxel, S. Allam, Robert A. Gruendl, Chihway Chang, Jennifer L. Marshall, Brad E. Tucker, Bonnie Zhang, Carlos E. Cunha, L. N. da Costa, Douglas L. Tucker, Kyler Kuehn, Matt J. Jarvis, P. Vielzeuf, Tim Eifler, Joshua A. Frieman, Flavia Sobreira, Fang Yuan, Brian Nord, Daniel Gruen, D. W. Gerdes, Markus Michael Rau, Bhuvnesh Jain, Enrique Gaztanaga, Vinu Vikram, S. A. Uddin, V. Scarpine, J. De Vicente, E. Suchyta, M. Carrasco Kind, August E. Evrard, C. Bonnett, Robert C. Nichol, Peter Melchior, Ricardo L. C. Ogando, and Ben Hoyle

Subjects
Physics, Cosmology and Nongalactic Astrophysics (astro-ph.CO), 010308 nuclear & particles physics, Astronomy, RCUK, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Redshift quantization, Redshift survey, 01 natural sciences, Redshift, Galaxy, Space and Planetary Science, 0103 physical sciences, Dark energy, Cluster analysis, 010303 astronomy & astrophysics, Weak gravitational lensing, STFC, Astrophysics::Galaxy Astrophysics, Astrophysics - Cosmology and Nongalactic Astrophysics, Photometric redshift
Abstract

We use numerical simulations to characterize the performance of a clustering-based method to calibrate photometric redshift biases. In particular, we cross-correlate the weak lensing (WL) source galaxies from the Dark Energy Survey Year 1 (DES Y1) sample with redMaGiC galaxies (luminous red galaxies with secure photometric redshifts) to estimate the redshift distribution of the former sample. The recovered redshift distributions are used to calibrate the photometric redshift bias of standard photo-$z$ methods applied to the same source galaxy sample. We apply the method to three photo-$z$ codes run in our simulated data: Bayesian Photometric Redshift (BPZ), Directional Neighborhood Fitting (DNF), and Random Forest-based photo-$z$ (RF). We characterize the systematic uncertainties of our calibration procedure, and find that these systematic uncertainties dominate our error budget. The dominant systematics are due to our assumption of unevolving bias and clustering across each redshift bin, and to differences between the shapes of the redshift distributions derived by clustering vs photo-$z$'s. The systematic uncertainty in the mean redshift bias of the source galaxy sample is $\Delta z \lesssim 0.02$, though the precise value depends on the redshift bin under consideration. We discuss possible ways to mitigate the impact of our dominant systematics in future analyses., Comment: submitted to MNRAS

159. Dark Energy Survey Year 1 Results: Measurement of the Baryon Acoustic Oscillation scale in the distribution of galaxies to redshift 1

Author

Erin Sheldon, David Brooks, M. E. C. Swanson, C. B. D'Andrea, I. Sevilla-Noarbe, Marcos Lima, Kwan Chuen Chan, Joseph J. Mohr, B. Flaugher, S. E. Kuhlmann, N. Kuropatkin, Tesla E. Jeltema, Santiago Avila, Carlos E. Cunha, L. N. da Costa, Juan Estrada, Ashley J. Ross, E. Suchyta, Daniel Gruen, August E. Evrard, Alistair R. Walker, Alex Drlica-Wagner, Michael Schubnell, H. Camacho, M. Sako, M. Carrasco Kind, D. L. Hollowood, S. Serrano, M. D. Johnson, Jochen Weller, F. J. Castander, Eric H. Neilsen, Martin Crocce, D. W. Gerdes, M. Banerji, Joshua A. Frieman, Ben Hoyle, A. Alarcon, Vinu Vikram, P. Fosalba, R. C. Smith, F. Lacasa, A. A. Plazas, Flavia Sobreira, Jack Elvin-Poole, E. Bertin, T. M. C. Abbott, D. L. Burke, A. Porredon, A. Roodman, Tommaso Giannantonio, Ramon Miquel, Peter Melchior, J. Annis, Marc Manera, Peter Doel, Nilanjan Banik, E. J. Sanchez, C. J. Miller, Brian Yanny, R. Cawthon, Jennifer L. Marshall, Ofer Lahav, N. Kokron, R. A. Bernstein, Shantanu Desai, H. T. Diehl, Darren L. DePoy, Basilio X. Santiago, Will J. Percival, V. Scarpine, M. A. G. Maia, Daniel Thomas, E. Buckley-Geer, S. Allam, Robert A. Gruendl, W. G. Hartley, J. P. Marriner, Enrique Gaztanaga, Juan Garcia-Bellido, Mathew Smith, Eduardo Rozo, C. Davis, Filipe B. Abdalla, Huan Lin, J. Gschwend, R. H. Schindler, Bhuvnesh Jain, Douglas L. Tucker, Gary Bernstein, Kyler Kuehn, Steve Kent, David J. James, Elisabeth Krause, G. Gutierrez, J. De Vicente, Yanxi Zhang, Tim Eifler, Michael Troxel, Risa H. Wechsler, A. K. Romer, Paul Martini, Rogerio Rosenfeld, J. Carretero, K. Bechtol, Eli S. Rykoff, A. Carnero Rosell, F. Andrade-Oliveira, Felipe Menanteau, Gregory Tarle, K. Honscheid, 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, Natl Optic Astron Observ, Univ London Univ Coll, Rhodes Univ, CSIC, IEEC, Fermilab Natl Accelerator Lab, LIneA, Universidade Estadual Paulista (Unesp), Univ Portsmouth, UAM, Univ Cambridge, Univ Florida, Univ Amsterdam, Leiden Univ, LSST, Observ Carnegie Inst Washington, Univ Penn, CNRS, UPMC Univ Paris 06, SLAC Natl Accelerator Lab, Stanford Univ, Universidade de São Paulo (USP), Observ Nacl, Natl Ctr Supercomp Applicat, Univ Illinois, Barcelona Inst Sci & Technol, Univ Chicago, Sun Yat Sen Univ, Ctr Invest Energet Med Medioambient & Tecnol CIEM, Texas A&M Univ, IIT Hyderabad, CALTECH, Steward Observ, Univ Manchester, Univ Michigan, Ludwig Maximilians Uni Munchen, Swiss Fed Inst Technol, Santa Cruz Inst Particle Phys, Ohio State Univ, Max Planck Inst Extraterrestrial Phys, Harvard Smithsonian Ctr Astrophys, Australian Astron Observ, Argonne Natl Lab, Univ Geneva, Princeton Univ, Inst Catalana Recerca & Estudis Avancats, Ludwig Maximilians Univ Munchen, Excellence Cluster Univ, Univ Sussex, Univ Arizona, Univ Fed Rio Grande do Sul, Brookhaven Natl Lab, Univ Southampton, Universidade Estadual de Campinas (UNICAMP), and Oak Ridge Natl Lab

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), Library science, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, 0103 physical sciences, media_common.cataloged_instance, European union, Astronomy observatory, 010303 astronomy & astrophysics, STFC, media_common, Physics, 010308 nuclear & particles physics, European research, RCUK, Astronomy and Astrophysics, observations [cosmology], Space and Planetary Science, Research council, cosmology: observations, Fundamental physics, astro-ph.CO, ESTRUTURA DO UNIVERSO, Christian ministry, large-scale structure of Universe, National laboratory, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We present angular diameter distance measurements obtained by locating the BAO scale in the distribution of galaxies selected from the first year of Dark Energy Survey data. We consider a sample of over 1.3 million galaxies distributed over a footprint of 1318 deg$^2$ with $0.6 < z_{\rm photo} < 1$ and a typical redshift uncertainty of $0.03(1+z)$. This sample was selected, as fully described in a companion paper, using a color/magnitude selection that optimizes trade-offs between number density and redshift uncertainty. We investigate the BAO signal in the projected clustering using three conventions, the angular separation, the co-moving transverse separation, and spherical harmonics. Further, we compare results obtained from template based and machine learning photometric redshift determinations. We use 1800 simulations that approximate our sample in order to produce covariance matrices and allow us to validate our distance scale measurement methodology. We measure the angular diameter distance, $D_A$, at the effective redshift of our sample divided by the true physical scale of the BAO feature, $r_{\rm d}$. We obtain close to a 4 per cent distance measurement of $D_A(z_{\rm eff}=0.81)/r_{\rm d} = 10.75\pm 0.43 $. These results are consistent with the flat $��$CDM concordance cosmological model supported by numerous other recent experimental results. All data products are publicly available here: https://des.ncsa.illinois.edu/releases/y1a1/bao, accepted by MNRAS; main results unchanged, some restructuring, clarifications, and robustness tests added based on referee's comments; all data products are publicly available here: https://des.ncsa.illinois.edu/releases/y1a1/bao

160. Weak lensing by galaxy troughs in DES Science Verification data

Author

Eli S. Rykoff, D. L. Burke, Risa H. Wechsler, Michael Troxel, Peter Doel, A. Carnero Rosell, M. Banerji, Marcos Lima, F. B. Abdalla, Kyler Kuehn, Tim Eifler, A. A. Plazas, Robert Armstrong, H. T. Diehl, R. C. Smith, V. Vikram, Diego Capozzi, A. Roodman, David Bacon, Bhuvnesh Jain, V. Scarpine, E. Suchyta, A. H. Bauer, Adam Amara, A. K. Romer, K. Honscheid, Darren L. DePoy, Martin Crocce, Robert A. Gruendl, William G. Hartley, R. A. Bernstein, Joe Zuntz, I. Sevilla-Noarbe, Daniel Thomas, A. Fausti Neto, E. Buckley-Geer, P. Martini, Yanming Zhang, Matthew R. Becker, David Brooks, Daniel Gruen, Flavia Sobreira, Sahar S. Allam, M. E. C. Swanson, Elisabeth Krause, E. Fernandez, L. N. da Costa, Christopher J. Miller, A. Mana, Ofer Lahav, M. A. G. Maia, Joseph J. Mohr, Jon J Thaler, M. Carrasco Kind, Alistair R. Walker, D. W. Gerdes, N. P. Kuropatkin, Kevin Reil, Marcelle Soares-Santos, M. March, M. S. Schubnell, Stella Seitz, Brian Nord, A. Benoit-Lévy, E. Bertin, Ramon Miquel, G. Gutierrez, Masao Sako, Gary Bernstein, Joshua A. Frieman, Gregory Tarle, Jochen Weller, Carlos Cunha, J. Carretero, T. M. C. Abbott, J. P. Dietrich, E. J. Sanchez, Tenglin Li, Sarah Bridle, C. Bonnett, Shantanu Desai, David J. James, Pablo Fosalba, B. Flaugher, C. B. D'Andrea, E. Sheldon, Tomasz Kacprzak, Ricardo L. C. Ogando, M. Jarvis, Eduardo Rozo, Oliver Friedrich, and Peter Melchior

Subjects
Cosmology and Gravitation, Cosmology and Nongalactic Astrophysics (astro-ph.CO), FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Galaxy merger, 01 natural sciences, weak [gravitational lensing], 0103 physical sciences, Galaxy formation and evolution, Brightest cluster galaxy, Interacting galaxy, 010303 astronomy & astrophysics, Weak gravitational lensing, Galaxy rotation curve, Astrophysics::Galaxy Astrophysics, STFC, QB, Physics, 010308 nuclear & particles physics, Astronomy, RCUK, Astronomy and Astrophysics, Galaxy, observations [cosmology], Space and Planetary Science, astro-ph.CO, Dark galaxy, Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We measure the weak lensing shear around galaxy troughs, i.e. the radial alignment of background galaxies relative to underdensities in projections of the foreground galaxy field over a wide range of redshift in Science Verification data from the Dark Energy Survey. Our detection of the shear signal is highly significant (10 to 15$\sigma$ for the smallest angular scales) for troughs with the redshift range z in [0.2,0.5] of the projected galaxy field and angular diameters of 10 arcmin...1{\deg}. These measurements probe the connection between the galaxy, matter density, and convergence fields. By assuming galaxies are biased tracers of the matter density with Poissonian noise, we find agreement of our measurements with predictions in a fiducial Lambda cold dark matter model. The prediction for the lensing signal on large trough scales is virtually independent of the details of the underlying model for the connection of galaxies and matter. Our comparison of the shear around troughs with that around cylinders with large galaxy counts is consistent with a symmetry between galaxy and matter over- and underdensities. In addition, we measure the two-point angular correlation of troughs with galaxies which, in contrast to the lensing signal, is sensitive to galaxy bias on all scales. The lensing signal of troughs and their clustering with galaxies is therefore a promising probe of the statistical properties of matter underdensities and their connection to the galaxy field., Comment: 15 pages, 8 figures; matches accepted version; high-resolution versions of figures can be downloaded from http://deswl.github.io

161. Weak lensing magnification in the Dark Energy Survey Science Verification Data

Author

Kyler Kuehn, David J. James, Rafael Ponce, Pablo Fosalba, Elisabeth Krause, M. Garcia-Fernandez, Michael Schubnell, Flavia Sobreira, Joshua A. Frieman, E. Suchyta, August E. Evrard, Filipe B. Abdalla, B. Flaugher, A. K. Romer, Matt J. Jarvis, David Brooks, V. Scarpine, Martin Crocce, Eli S. Rykoff, M. Carrasco Kind, J. Carretero, Tim Eifler, Jennifer L. Marshall, M. March, Ben Hoyle, Shantanu Desai, Donnacha Kirk, Ofer Lahav, Alistair R. Walker, Marcelle Soares-Santos, Ramon Miquel, E. Bertin, I. Sevilla-Noarbe, A. Carnero Rosell, M. A. G. Maia, N. Kuropatkin, G. Tarle, L. N. da Costa, W. C. Wester, Daniel Gruen, Enrique Fernández, Enrique Gaztanaga, J. Gschwend, Juan Garcia-Bellido, Marcos Lima, G. Gutierrez, Gary Bernstein, R. C. Smith, Daniel Thomas, E. Buckley-Geer, D. L. Burke, J. Annis, Jovan Aleksić, Peter Melchior, S. Allam, Robert A. Gruendl, A. Benoit-Lévy, H. T. Diehl, D. W. Gerdes, Niall MacCrann, E. M. Huff, F. J. Castander, T. M. C. Abbott, E. J. Sanchez, A. Roodman, Tommaso Giannantonio, Carlos E. Cunha, C. B. D'Andrea, Joseph J. Mohr, A. A. Plazas, Darren L. DePoy, 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), and DES

Subjects
Cosmology and Nongalactic Astrophysics (astro-ph.CO), Monte Carlo method, FOS: Physical sciences, Magnification, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, techniques: photometric, gravitational lensing: weak, 0103 physical sciences, 010303 astronomy & astrophysics, Weak gravitational lensing, STFC, Astrophysics::Galaxy Astrophysics, QB, Photometric redshift, Physics, 010308 nuclear & particles physics, Astronomy, RCUK, Astronomy and Astrophysics, methods: data analysis, Redshift, Galaxy, Data set, Space and Planetary Science, Dark energy, astro-ph.CO, Astrophysics::Earth and Planetary Astrophysics, large-scale structure of Universe, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

In this paper the effect of weak lensing magnification on galaxy number counts is studied by cross-correlating the positions of two galaxy samples, separated by redshift, using data from the Dark Energy Survey Science Verification dataset. The analysis is carried out for two photometrically-selected galaxy samples, with mean photometric redshifts in the $0.2 < z < 0.4$ and $0.7 < z < 1.0$ ranges, in the riz bands. A signal is detected with a $3.5��$ significance level in each of the bands tested, and is compatible with the magnification predicted by the $��$CDM model. After an extensive analysis, it cannot be attributed to any known systematic effect. The detection of the magnification signal is robust to estimated uncertainties in the outlier rate of the pho- tometric redshifts, but this will be an important issue for use of photometric redshifts in magnification mesurements from larger samples. In addition to the detection of the magnification signal, a method to select the sample with the maximum signal-to-noise is proposed and validated with data., 18 pages, 16 figures, submitted to MNRAS

162. Photometric redshifts and clustering of emission line galaxies selected jointly by DES and eBOSS

Author

T. M. C. Abbott, E. J. Sanchez, H. Camacho, Kevin Reil, J. Carretero, Peter Doel, M. Sako, David J. Brooks, Guangtun Zhu, Flavia Sobreira, K. Honscheid, Luiz N. da Costa, Johan Comparat, G. Gutierrez, Shantanu Desai, Huan Lin, Ofer Lahav, Tianjun Li, Juan Estrada, Ramon Miquel, Eli S. Rykoff, E. Suchyta, V. Scarpine, Marcos Lima, J. J. Thaler, David J. James, A. A. Plazas, Will J. Percival, Diego Capozzi, M. March, Basilio X. Santiago, A. De La Macora, Francisco Prada, Pablo Fosalba, E. Bertin, Jean-Paul Kneib, Jennifer L. Marshall, A. Benoit-Lévy, Y. Zhang, F. B. Abdalla, Tim Eifler, Francisco J. Castander, Gregory Tarle, Alex Merson, Joel R. Brownstein, A. Roodman, Timothée Delubac, Daniel Gruen, B. Flaugher, S. Allam, Robert A. Gruendl, D. W. Gerdes, I. Sevilla-Noarbe, N. Kuropatkin, M. Carrasco Kind, Alistair R. Walker, M. Banerji, Joshua A. Frieman, Marcelle Soares-Santos, Enrique Gaztanaga, Daniel Thomas, Kyler Kuehn, Stephanie Jouvel, M. A. G. Maia, A. Carnero, Ricardo L. C. Ogando, A. K. Romer, A. Fausti Neto, Carlos E. Cunha, 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 ), DES, BOSS, Institut d'Astrophysique de Paris (IAP), and Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Cosmology and Gravitation, Cosmology and Nongalactic Astrophysics (astro-ph.CO), [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], Population, FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Surveys, 01 natural sciences, Photometry (optics), surveys, 0103 physical sciences, Astrophysics::Solar and Stellar Astrophysics, Emission spectrum, education, observations [Cosmology], 010303 astronomy & astrophysics, STFC, Astrophysics::Galaxy Astrophysics, Photometric redshift, QB, Physics, education.field_of_study, 010308 nuclear & particles physics, Astronomy, RCUK, Astronomy and Astrophysics, Redshift survey, redshift, target selection, DES, Redshift, Galaxy, Baryon, Space and Planetary Science, cosmology: observations, astro-ph.CO, Astrophysics::Earth and Planetary Astrophysics, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Cosmology and Nongalactic Astrophysics
Abstract

We present the results of the first test plates of the extended Baryon Oscillation Spectroscopic Survey. This paper focuses on the emission line galaxies (ELG) population targetted from the Dark Energy Survey (DES) photometry. We analyse the success rate, efficiency, redshift distribution, and clustering properties of the targets. From the 9000 spectroscopic redshifts targetted, 4600 have been selected from the DES photometry. The total success rate for redshifts between 0.6 and 1.2 is 71\% and 68\% respectively for a bright and faint, on average more distant, samples including redshifts measured from a single strong emission line. We find a mean redshift of 0.8 and 0.87, with 15 and 13\% of unknown redshifts respectively for the bright and faint samples. In the redshift range 0.6

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