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Title: Cosmic shear results from the deep lens survey. II. Full cosmological parameter constraints from tomography

Abstract

Here, we present a tomographic cosmic shear study from the Deep Lens Survey (DLS), which, providing a limiting magnitude $${r}_{\mathrm{lim}}\sim 27$$ ($$5\sigma $$), is designed as a precursor Large Synoptic Survey Telescope (LSST) survey with an emphasis on depth. Using five tomographic redshift bins, we study their auto- and cross-correlations to constrain cosmological parameters. We use a luminosity-dependent nonlinear model to account for the astrophysical systematics originating from intrinsic alignments of galaxy shapes. We find that the cosmological leverage of the DLS is among the highest among existing $$\gt 10$$ deg2 cosmic shear surveys. Combining the DLS tomography with the 9 yr results of the Wilkinson Microwave Anisotropy Probe (WMAP9) gives $${{\rm{\Omega }}}_{m}={0.293}_{-0.014}^{+0.012}$$, $${\sigma }_{8}={0.833}_{-0.018}^{+0.011}$$, $${H}_{0}={68.6}_{-1.2}^{+1.4}\;{\text{km s}}^{-1}\;{{\rm{Mpc}}}^{-1}$$, and $${{\rm{\Omega }}}_{b}=0.0475\pm 0.0012$$ for ΛCDM, reducing the uncertainties of the WMAP9-only constraints by ~50%. When we do not assume flatness for ΛCDM, we obtain the curvature constraint $${{\rm{\Omega }}}_{k}=-{0.010}_{-0.015}^{+0.013}$$ from the DLS+WMAP9 combination, which, however, is not well constrained when WMAP9 is used alone. The dark energy equation-of-state parameter w is tightly constrained when baryonic acoustic oscillation (BAO) data are added, yielding $$w=-{1.02}_{-0.09}^{+0.10}$$ with the DLS+WMAP9+BAO joint probe. The addition of supernova constraints further tightens the parameter to $$w=-1.03\pm 0.03$$. Our joint constraints are fully consistent with the final Planck results and also with the predictions of a ΛCDM universe.

Authors:
 [1];  [2];  [3]; ORCiD logo [4];  [2]; ORCiD logo [2]
  1. Yonsei Univ., Seoul (Korea); Univ. of California, Davis, CA (United States)
  2. Univ. of California, Davis, CA (United States)
  3. Excellence Cluster Universe, Garching (Germany); Univ.-Sternwarte, Munchen (Germany)
  4. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1338898
Report Number(s):
LLNL-JRNL-672576
Journal ID: ISSN 1538-4357
Grant/Contract Number:
AC52-07NA27344
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 824; Journal Issue: 2; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; cosmological parameters; cosmology: observations; dark matter; gravitational lensing: weak; large-scale structure of universe

Citation Formats

Jee, M. James, Tyson, J. Anthony, Hilbert, Stefan, Schneider, Michael D., Schmidt, Samuel, and Wittman, David. Cosmic shear results from the deep lens survey. II. Full cosmological parameter constraints from tomography. United States: N. p., 2016. Web. doi:10.3847/0004-637X/824/2/77.
Jee, M. James, Tyson, J. Anthony, Hilbert, Stefan, Schneider, Michael D., Schmidt, Samuel, & Wittman, David. Cosmic shear results from the deep lens survey. II. Full cosmological parameter constraints from tomography. United States. doi:10.3847/0004-637X/824/2/77.
Jee, M. James, Tyson, J. Anthony, Hilbert, Stefan, Schneider, Michael D., Schmidt, Samuel, and Wittman, David. 2016. "Cosmic shear results from the deep lens survey. II. Full cosmological parameter constraints from tomography". United States. doi:10.3847/0004-637X/824/2/77. https://www.osti.gov/servlets/purl/1338898.
@article{osti_1338898,
title = {Cosmic shear results from the deep lens survey. II. Full cosmological parameter constraints from tomography},
author = {Jee, M. James and Tyson, J. Anthony and Hilbert, Stefan and Schneider, Michael D. and Schmidt, Samuel and Wittman, David},
abstractNote = {Here, we present a tomographic cosmic shear study from the Deep Lens Survey (DLS), which, providing a limiting magnitude ${r}_{\mathrm{lim}}\sim 27$ ($5\sigma $), is designed as a precursor Large Synoptic Survey Telescope (LSST) survey with an emphasis on depth. Using five tomographic redshift bins, we study their auto- and cross-correlations to constrain cosmological parameters. We use a luminosity-dependent nonlinear model to account for the astrophysical systematics originating from intrinsic alignments of galaxy shapes. We find that the cosmological leverage of the DLS is among the highest among existing $\gt 10$ deg2 cosmic shear surveys. Combining the DLS tomography with the 9 yr results of the Wilkinson Microwave Anisotropy Probe (WMAP9) gives ${{\rm{\Omega }}}_{m}={0.293}_{-0.014}^{+0.012}$, ${\sigma }_{8}={0.833}_{-0.018}^{+0.011}$, ${H}_{0}={68.6}_{-1.2}^{+1.4}\;{\text{km s}}^{-1}\;{{\rm{Mpc}}}^{-1}$, and ${{\rm{\Omega }}}_{b}=0.0475\pm 0.0012$ for ΛCDM, reducing the uncertainties of the WMAP9-only constraints by ~50%. When we do not assume flatness for ΛCDM, we obtain the curvature constraint ${{\rm{\Omega }}}_{k}=-{0.010}_{-0.015}^{+0.013}$ from the DLS+WMAP9 combination, which, however, is not well constrained when WMAP9 is used alone. The dark energy equation-of-state parameter w is tightly constrained when baryonic acoustic oscillation (BAO) data are added, yielding $w=-{1.02}_{-0.09}^{+0.10}$ with the DLS+WMAP9+BAO joint probe. The addition of supernova constraints further tightens the parameter to $w=-1.03\pm 0.03$. Our joint constraints are fully consistent with the final Planck results and also with the predictions of a ΛCDM universe.},
doi = {10.3847/0004-637X/824/2/77},
journal = {The Astrophysical Journal (Online)},
number = 2,
volume = 824,
place = {United States},
year = 2016,
month = 6
}

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Cited by: 6works
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  • We present a cosmic shear study from the Deep Lens Survey (DLS), a deep BVRz multi-band imaging survey of five 4 deg{sup 2} fields with two National Optical Astronomy Observatory (NOAO) 4 m telescopes at Kitt Peak and Cerro Tololo. For both telescopes, the change of the point-spread-function (PSF) shape across the focal plane is complicated, and the exposure-to-exposure variation of this position-dependent PSF change is significant. We overcome this challenge by modeling the PSF separately for individual exposures and CCDs with principal component analysis (PCA). We find that stacking these PSFs reproduces the final PSF pattern on the mosaicmore » image with high fidelity, and the method successfully separates PSF-induced systematics from gravitational lensing effects. We calibrate our shears and estimate the errors, utilizing an image simulator, which generates sheared ground-based galaxy images from deep Hubble Space Telescope archival data with a realistic atmospheric turbulence model. For cosmological parameter constraints, we marginalize over shear calibration error, photometric redshift uncertainty, and the Hubble constant. We use cosmology-dependent covariances for the Markov Chain Monte Carlo analysis and find that the role of this varying covariance is critical in our parameter estimation. Our current non-tomographic analysis alone constrains the {Omega} {sub M}-{sigma}{sub 8} likelihood contour tightly, providing a joint constraint of {Omega} {sub M} = 0.262 {+-} 0.051 and {sigma}{sub 8} = 0.868 {+-} 0.071. We expect that a future DLS weak-lensing tomographic study will further tighten these constraints because explicit treatment of the redshift dependence of cosmic shear more efficiently breaks the {Omega} {sub M}-{sigma}{sub 8} degeneracy. Combining the current results with the Wilkinson Microwave Anisotropy Probe 7 year (WMAP7) likelihood data, we obtain {Omega} {sub M} = 0.278 {+-} 0.018 and {sigma}{sub 8} = 0.815 {+-} 0.020.« less
  • We present weak lensing mass estimates of seven shear-selected galaxy cluster candidates from the deep lens survey. The clusters were previously identified as mass peaks in convergence maps of 8.6 deg{sup 2} of R-band imaging, and followed up with X-ray and spectroscopic confirmation, spanning a redshift range 0.19-0.68. Most clusters contained multiple X-ray peaks, yielding 17 total mass concentrations. In this paper, we constrain the masses of these X-ray sources with weak lensing, using photometric redshifts from the full set of BVRz' imaging to properly weight background galaxies according to their lensing distance ratios. We fit both NFW and singularmore » isothermal sphere profiles, and find that the results are insensitive to the assumed profile. We also show that the results do not depend significantly on the assumed prior on the position of the mass peak, but that this may become an issue in future larger samples. The inferred velocity dispersions for the extended X-ray sources range from 250 to 800 km s{sup -1}, with the exception of one source for which no lensing signal was found. This work further establishes shear selection as a viable technique for finding clusters, but also highlights some unresolved issues such as determination of the mass profile center without biasing the mass estimate, and fully accounting for line-of-sight projections. A follow-up paper will examine the mass-X-ray scaling relations of these clusters.« less
  • Cited by 34