The Gravitational Lensing Imprints of DES Y3 Superstructures on the CMB: A Matched Filtering Approach

Abstract

Low density cosmic voids gravitationally lens the cosmic microwave background (CMB), leaving a negative imprint on the CMB convergence $\kappa$. This effect provides insight into the distribution of matter within voids, and can also be used to study the growth of structure. We measure this lensing imprint by cross-correlating the Planck CMB lensing convergence map with voids identified in the Dark Energy Survey Year 3 data set, covering approximately 4,200 deg${}^2$ of the sky. We use two distinct void-finding algorithms: a 2D void-finder which operates on the projected galaxy density field in thin redshift shells, and a new code, Voxel, which operates on the full 3D map of galaxy positions. We employ an optimal matched filtering method for cross-correlation, using the MICE N-body simulation both to establish the template for the matched filter and to calibrate detection significances. Using the DES Y3 photometric luminous red galaxy sample, we measure $A_{\kappa }$, the amplitude of the observed lensing signal relative to the simulation template, obtaining $A_{\kappa }=1.03\pm 0.22$ ($4.6\sigma$ significance) for Voxel and $A_{\kappa }=1.02\pm 0.17$ ($5.9\sigma$ significance) for 2D voids, both consistent with $\Lambda$CDM expectations. We additionally invert the 2D void-finding process to identify superclusters in the projected density field, for which we measure $A_{\kappa }=0.87\pm 0.15$ ($5.9\sigma$ significance). The leading source of noise in our measurements is Planck noise, implying that future data from the Atacama Cosmology Telescope (ACT), South Pole Telescope (SPT) and CMB-S4 will increase sensitivity and allow for more precise measurements.

16 pages, 9 figures. Accepted for publication in MNRAS

References in corpus (28)

• Large Magellanic Cloud Cepheid Standards Provide a 1% Foundation for the Determination of the Hubble Constant and Stronger Evidence for Physics Beyond LambdaCDM
• Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Likelihoods and Parameters from the WMAP data
• The DESI Experiment Part I: Science,Targeting, and Survey Design
• Massive neutrinos and cosmology
• Why your model parameter confidences might be too optimistic -- unbiased estimation of the inverse covariance matrix
• ZOBOV: a parameter-free void-finding algorithm
• An Imprint of Super-Structures on the Microwave Background due to the Integrated Sachs-Wolfe Effect
• The DESI Experiment Part II: Instrument Design
• The onion universe: all sky lightcone simulations in spherical shells
• Beyond BAO: improving cosmological constraints from BOSS with measurement of the void-galaxy cross-correlation
• Evidence of Lensing of the Cosmic Microwave Background by Dark Matter Halos
• A Measurement of Gravitational Lensing of the Cosmic Microwave Background by Galaxy Clusters Using Data from the South Pole Telescope
• A detection of the integrated Sachs-Wolfe imprint of cosmic superstructures using a matched-filter approach
• Dark Energy Survey Year 3 results: Cosmological constraints from galaxy clustering and galaxy-galaxy lensing using the MagLim lens sample
• The completed SDSS-IV extended Baryon Oscillation Spectroscopic Survey: geometry and growth from the anisotropic void-galaxy correlation function in the luminous red galaxy sample
• The lensing and temperature imprints of voids on the Cosmic Microwave Background
• The Jubilee ISW Project II: observed and simulated imprints of voids and superclusters on the cosmic microwave background
• The DES view of the Eridanus supervoid and the CMB Cold Spot
• Evidence for a high-z ISW signal from supervoids in the distribution of eBOSS quasars
• Creating Jackknife and Bootstrap estimates of the covariance matrix for the two-point correlation function
• The Gravitational Lensing Signatures of BOSS Voids in the Cosmic Microwave Background
• Stacked CMB lensing and ISW signals around superstructures in the DESI Legacy Survey
• DEMNUni: The imprint of massive neutrinos on the cross-correlation between cosmic voids and CMB lensing
• Tracing the gravitational potential using cosmic voids
• Euclid: Cosmology forecasts from the void-galaxy cross-correlation function with reconstruction
• Dark Energy Survey Year 3 results: imprints of cosmic voids and superclusters in the Planck CMB lensing map
• Cosmological measurements from void-galaxy and galaxy-galaxy clustering in the Sloan Digital Sky Survey
• The CMB lensing imprint of cosmic voids detected in the WISE-Pan-STARRS luminous red galaxy catalog

Cited by in corpus (2)

• The CosmoVerse White Paper: Addressing observational tensions in cosmology with systematics and fundamental physics
• Cosmology with Cosmic Voids