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Redshift distributions of galaxies in the Dark Energy Survey Science Verification shear catalogue and implications for weak lensing

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Redshift distributions of galaxies in the Dark Energy Survey Science Verification shear catalogue and implications for weak lensing

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Título Redshift distributions of galaxies in the Dark Energy Survey Science Verification shear catalogue and implications for weak lensing
Autor Bonnett, Christopher
Troxel, Michael
Hartley, William
Amara, Adam
Leistedt, Boris
Becker, Matthew R.
Bernstein, Gary M.
Bridle, Sarah Louise
Bruderer, Claudio
Busha, M. T.
Carrasco Kind, Matías
Childress, Michael
Castander Serentill, Francisco Javier
Chang, Chihway
Crocce, Martin
Davis, Tamara M.
Eifler, Tim
Frieman, Joshua A.
Gangkofner, C.
Gaztañaga, Enrique
Glazebrook, Karl
Gruen, Daniel
Kacprzak, Tomasz
King, Anthea L.
Kwan, Juliana
Lahav, Ofer
Lewis, Geraint F.
Lidman, Chris
Lin, H.
MacCrann, Niall
Miquel, Ramon
O'Neill, C. R.
Palmese, A.
Peiris, Hiranya V.
Refregier, Alexandre
Rozo, Eduardo
Rykoff, Eli
Sadeh, Iftach
Sánchez Alonso, Carles
Sheldon, Erin
Uddin, Syed
Wechsler, Risa H.
Zuntz, J.
Abbott, Timothy M. C.
Abdalla, Filipe B.
Allam, Sahar S.
Armstrong, Robert
Banerji, M.
Bauer, Anne Hollister
Benoit-Lévy, Aurélien
Bertin, Emmanuel
Brooks, D.
Buckley-Geer, Elizabeth
Burke, David Lyle
Capozzi, Diego
Carnero Rosell, Aurelio
Carretero Palacios, Jorge
Cunha, Carlos Eduardo
D'Andrea, Christopher B.
Costa, Luiz N. da
DePoy, Darren L.
Desai, S.
Diehl, H. Thomas
Dietrich, Jörg P.
Doel, Peter
Fausti Neto, Angelo
Fernandez, Enrique
Flaugher, Brenna
Fosalba Vela, Pablo
Gerdes, David W.
Gruendl, Robert A.
Honscheid, K.
Jain, Bhuvnesh
James, David J.
Jarvis, Michael
Kim, A. G.
Kuehn, Kyler
Kuropatkin, Nikolay P.
Li, T. S.
Lima, Marcos Vinicius Borges Teixeira
Maia, Marcio Antonio Geimba
March, Marisa Cristina
Marshall, Jennifer L.
Martini, Paul
Melchior, Peter M.
Miller, Christopher J.
Neilsen, Eric H.
Nichol, Robert C.
Nord, Brian Dennis
Ogando, Ricardo L.C.
Plazas Malagón, Andrés Alejandro
Reil, Kevin
Romer, Anita K.
Roodman, Aaron
Sako, Masao
Sanchez-Alvaro, Eusebio
Santiago, Basilio Xavier
Smith, Robert Christopher
Soares-Santos, Marcelle
Sobreira, Flávia
Suchyta, Eric
Swanson, Molly E. C.
Tarle, Gregory
Thaler, Jon J.
Thomas, D.
Vikram, Vinu
Walker, Alistair
DES Collaboration
Abstract We present photometric redshift estimates for galaxies used in the weak lensing analysis of the Dark Energy Survey Science Verification (DES SV) data. Four model- or machine learning-based photometric redshift methods—ANNZ2, BPZ calibrated against BCC-Ufig simulations, SKYNET, and TPZ—are analyzed. For training, calibration, and testing of these methods, we construct a catalogue of spectroscopically confirmed galaxies matched against DES SV data. The performance of the methods is evaluated against the matched spectroscopic catalogue, focusing on metrics relevant for weak lensing analyses, with additional validation against COSMOS photo-z’s. From the galaxies in the DES SV shear catalogue, which have mean redshift 0.72 0.01 over the range 0.3 < z < 1.3, we construct three tomographic bins with means of z ¼ f0.45; 0.67; 1.00g. These bins each have systematic uncertainties δz ≲ 0.05 in the mean of the fiducial SKYNET photo-z nðzÞ. We propagate the errors in the redshift distributions through to their impact on cosmological parameters estimated with cosmic shear, and find that they cause shifts in the value of σ8 of approximately 3%. This shift is within the one sigma statistical errors on σ8 for the DES SV shear catalogue. We further study the potential impact of systematic differences on the critical surface density, Σcrit, finding levels of bias safely less than the statistical power of DES SV data. We recommend a final Gaussian prior for the photo-z bias in the mean of nðzÞ of width 0.05 for each of the three tomographic bins, and show that this is a sufficient bias model for the corresponding cosmology analysis.
Contido em Physical review. D, Particles, fields, gravitation, and cosmology. College Park. Vol. 94, no. 4 (Aug. 2016), 042005, 26 p.
Assunto Deslocamento para o vermelho
Fotometria astronômica
Galáxias
Lentes gravitacionais
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/164977
Arquivos Descrição Formato
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