Cosmic shear measurements with Dark Energy Survey Science Verification data

Journal Article · Wed Jul 06 04:00:00 UTC 2016 · Physical Review. D.

DOI: https://doi.org/10.1103/physrevd.94.022002 · OSTI ID:1223234

Becker, M.  R.; Troxel, M.  A.; MacCrann, N.; Krause, E.; Eifler, T.  F.; Friedrich, O.; Nicola, A.; Refregier, A.; Amara, A.; Bacon, D.; Bernstein, G.  M.; Bonnett, C.; Bridle, S.  L.; Busha, M.  T.; Chang, C.; Dodelson, S.; Erickson, B.; Evrard, A.  E.; Frieman, J.; Gaztanaga, E. ; Gruen, D.; Hartley, W.; Jain, B.; Jarvis, M.; Kacprzak, T.; Kirk, D.; Kravtsov, A.; Leistedt, B.; Peiris, H.  V.; Rykoff, E.  S.; Sabiu, C.; Sánchez, C.; Seo, H.; Sheldon, E.; Wechsler, R.  H.; Zuntz, J.; Abbott, T.; Abdalla, F.  B.; Allam, S.; Armstrong, R.; Banerji, M.; Bauer, A.  H.; Benoit-Lévy, A.; Bertin, E.; Brooks, D.; Buckley-Geer, E.; Burke, D.  L.; Capozzi, D.; Carnero Rosell, A.; Carrasco Kind, M.; Carretero, J.; Castander, F.  J.; Crocce, M.; Cunha, C.  E.; D’Andrea, C.  B.; da Costa, L.  N.; DePoy, D.  L.; Desai, S.; Diehl, H.  T.; Dietrich, J.  P.; Doel, P.; Fausti Neto, A.; Fernandez, E.; Finley, D.  A.; Flaugher, B.; Fosalba, P.; Gerdes, D.  W.; Gruendl, R.  A.; Gutierrez, G.; Honscheid, K.; James, D.  J.; Kuehn, K.; Kuropatkin, N.; Lahav, O.; Li, T.  S.; Lima, M.; Maia, M.  A. G.; March, M.; Martini, P.; Melchior, P.; Miller, C.  J.; Miquel, R.; Mohr, J.  J.; Nichol, R.  C.; Nord, B.; Ogando, R.; Plazas, A.  A.; Reil, K.; Romer, A.  K.; Roodman, A.; Sako, M.; Sanchez, E.; Scarpine, V.; Schubnell, M.; Sevilla-Noarbe, I.; Smith, R.  C.; Soares-Santos, M.; Sobreira, F.; Suchyta, E.; Swanson, M.  E. C.; Tarle, G.; Thaler, J.; Thomas, D.; Vikram, V.; Walker, A.  R.

Here, we present measurements of weak gravitational lensing cosmic shear two-point statistics using Dark Energy Survey Science Verification data. We also demonstrate that our results are robust to the choice of shear measurement pipeline, either ngmix or im3shape, and robust to the choice of two-point statistic, including both real and Fourier-space statistics. Our results pass a suite of null tests including tests for B-mode contamination and direct tests for any dependence of the two-point functions on a set of 16 observing conditions and galaxy properties, such as seeing, airmass, galaxy color, galaxy magnitude, etc. We furthermore use a large suite of simulations to compute the covariance matrix of the cosmic shear measurements and assign statistical significance to our null tests. We find that our covariance matrix is consistent with the halo model prediction, indicating that it has the appropriate level of halo sample variance. We also compare the same jackknife procedure applied to the data and the simulations in order to search for additional sources of noise not captured by the simulations. We find no statistically significant extra sources of noise in the data. We determined that the overall detection significance with tomography for our highest source density catalog is 9.7 σ. Cosmological constraints from the measurements in this work are presented in a companion paper [DES et al., Phys. Rev. D 94, 022001 (2016).].

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC); National Science Foundation (NSF)
• Contributing Organization: The Dark Energy Survey Collaboration
• Grant/Contract Number: AC02-07CH11359; SC0007901
• OSTI ID: 1223234
• Report Number(s): FERMILAB-PUB--15-303-AE; arXiv eprint number arXiv:1507.05598
• Journal Information: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 2 Vol. 94; ISSN 2470-0010
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English