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Title: Cosmic shear measurements with Dark Energy Survey Science Verification data

Abstract

Here, we present measurements of weak gravitational lensing cosmic shear two-point statistics using Dark Energy Survey Science Verification data. We 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 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. The overall detection significance with tomography for our highest source density catalog is 9.7σ. Cosmological constraints from themore » measurements in this work are presented in a companion paper.« less

Authors:
 [1]
  1. Stanford Univ., Stanford, CA (United States). et al.
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States); Brookhaven National Lab. (BNL), Upton, NY (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Contributing Org.:
DES Collaboration; The Dark Energy Survey Collaboration
OSTI Identifier:
1223234
Alternate Identifier(s):
OSTI ID: 1260444; OSTI ID: 1336143; OSTI ID: 1346696
Report Number(s):
FERMILAB-PUB-15-303-AE; BNL-112620-2016-JA
Journal ID: ISSN 2470-0010; arXiv eprint number arXiv:1507.05598; TRN: US1601623
Grant/Contract Number:  
AC02-07CH11359; FERMILAB-PUB-15-285-AE; AC02-98CH10886; SC0007901; FG02-91ER40690; SC00112704; AC02-06CH11357
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 94; Journal Issue: 2; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; gravitational lensing: weak; methods: data analysis

Citation Formats

Becker, M. R. Cosmic shear measurements with Dark Energy Survey Science Verification data. United States: N. p., 2016. Web. doi:10.1103/PhysRevD.94.022002.
Becker, M. R. Cosmic shear measurements with Dark Energy Survey Science Verification data. United States. doi:10.1103/PhysRevD.94.022002.
Becker, M. R. Wed . "Cosmic shear measurements with Dark Energy Survey Science Verification data". United States. doi:10.1103/PhysRevD.94.022002. https://www.osti.gov/servlets/purl/1223234.
@article{osti_1223234,
title = {Cosmic shear measurements with Dark Energy Survey Science Verification data},
author = {Becker, M. R.},
abstractNote = {Here, we present measurements of weak gravitational lensing cosmic shear two-point statistics using Dark Energy Survey Science Verification data. We 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 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. The overall detection significance with tomography for our highest source density catalog is 9.7σ. Cosmological constraints from the measurements in this work are presented in a companion paper.},
doi = {10.1103/PhysRevD.94.022002},
journal = {Physical Review D},
number = 2,
volume = 94,
place = {United States},
year = {2016},
month = {7}
}

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Cited by: 30 works
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