MAPPING AND SIMULATING SYSTEMATICS DUE TO SPATIALLY VARYING OBSERVING CONDITIONS IN DES SCIENCE VERIFICATION DATA
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Leistedt_2016_ApJS_226_24.pdf
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Author
Leistedt, B.
Peiris, H. V.
Elsner, F.
Benoit-Lévy, A.
Amara, A.
Bauer, A. H.
Becker, M. R.
Bonnett, C.
Bruderer, C.
Busha, M. T.
Kind, M. Carrasco
Chang, Chihway

Crocce, M.
da Costa, L. N.
Gaztanaga, E.
Huff, E. M.
Lahav, O.
Palmese, A.
Percival, W. J.
Refregier, A.
Ross, A. J.
Rozo, E.
Rykoff, Eli

Sánchez, C.

Sadeh, I.
Sevilla-Noarbe, I.
Sobreira, F.
Suchyta, E.
Swanson, M. E. C.
Wechsler, Risa H.

Abdalla, F. B.
Allam, S.
Banerji, M.
Bernstein, G. M.
Bernstein, R. A.
Bertin, E.
Bridle, S. L.
Brooks, D.
Buckley-Geer, E.
Burke, D. L.
Capozzi, D.
Rosell, Aurelio Carnero

Carretero, J.
Cunha, C. E.
D’Andrea, C. B.
DePoy, D. L.
Desai, S.
Diehl, H. T.
Doel, P.
Eifler, T. F.
Evrard, A. E.
Neto, A. Fausti
Flaugher, B.
Fosalba, P.
Frieman, J.
Gerdes, D. W.

Gruen, D.
Gruendl, R. A.

Gutierrez, G.
Honscheid, K.
James, D. J.
Jarvis, M.
Kent, S.
Kuehn, K.
Kuropatkin, N.
Li, T. S.
Lima, M.
Maia, M. A. G.
March, M.
Marshall, J. L.
Martini, P.
Melchior, P.
Miller, C. J.
Miquel, R.
Nichol, R. C.
Nord, B.

Ogando, R.
Plazas, A. A.
Reil, K.
Romer, A. K.
Roodman, A.
Sanchez, E.
Santiago, B.
Scarpine, V.
Schubnell, M.
Smith, R. C.
Soares-Santos, M.

Tarle, G.

Thaler, J.
Thomas, D.
Vikram, V.
Walker, A. R.
Wester, W.
Zhang, Y.
Zuntz, J.
Affiliation
Univ Arizona, Dept PhysIssue Date
2016-10-17Keywords
cosmology: observationsgalaxies: distances and redshifts
galaxies: statistics
large-scale structure of universe
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IOP PUBLISHING LTDCitation
MAPPING AND SIMULATING SYSTEMATICS DUE TO SPATIALLY VARYING OBSERVING CONDITIONS IN DES SCIENCE VERIFICATION DATA 2016, 226 (2):24 The Astrophysical Journal Supplement SeriesRights
© 2016. The American Astronomical Society. All rights reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Spatially varying depth and the characteristics of observing conditions, such as seeing, airmass, or sky background, are major sources of systematic uncertainties in modern galaxy survey analyses, particularly 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 complementary nature of these two approaches by comparing the SV data with BCC-UFig, a synthetic sky catalog generated by forward-modeling of the DES-SV images. We analyze 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 are 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. However, they will need to be carefully characterized in upcoming phases of DES in order to avoid biasing the inferred cosmological results. 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, which will require detailed null tests and realistic end-to-end image simulations to correctly interpret the deep, high-cadence observations of the sky.ISSN
1538-4365Version
Final published versionSponsors
MINECO [AYA2012-39559, ESP2013-48274, FPA2013-47986]; Centro de Excelencia Severo Ochoa [SEV-2012-0234]; European Research Council under the European Union's Seventh Framework Programme (FP7) [240672, 291329, 306478]; STFC; European Research Council under the European Community's Seventh Framework Programme (FP7)/ERC [306478]; National Science Foundation [PHYS-1066293, AST-1138766]; Swiss National Foundation [200021-149442, 200021-143906]; CAPES [3171-13-2]; FAPESP; CNPq; U.S. Department of Energy; U.S. National Science Foundation; Ministry of Science and Education of Spain; Science and Technology Facilities Council of the United Kingdom; Higher Education Funding Council for England; National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign; Kavli Institute of Cosmological Physics at the University of Chicago; Center for Cosmology and Astro-Particle Physics at the Ohio State University; Mitchell Institute for Fundamental Physics and Astronomy at Texas AM University; Financiadora de Estudos e Projetos; Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro; Conselho Nacional de Desenvolvimento Cientifico e Tecnologico; Ministerio da Ciencia, Tecnologia e Inovacao; Deutsche Forschungsgemeinschaft; DESAdditional Links
http://stacks.iop.org/0067-0049/226/i=2/a=24?key=crossref.1c104210c0088494d09c28895cb87e0cae974a485f413a2113503eed53cd6c53
10.3847/0067-0049/226/2/24