학술논문
The Gravitational Lensing Imprints of DES Y3 Superstructures on the CMB: A Matched Filtering Approach
Document Type
Working Paper
Author
Demirbozan, Umut; Nadathur, Seshadri; Ferrero, Ismael; Fosalba, Pablo; Kovacs, Andras; Miquel, Ramon; Davies, Christopher T.; Pandey, Shivam; Adamow, Monika; Bechtol, Keith; Drlica-Wagner, Alex; Gruendl, Robert; Hartley, Will; Pieres, Adriano; Ross, Ashley; Rykoff, Eli; Sheldon, Erin; Yanny, Brian; Abbott, Tim; Aguena, Michel; Allam, Sahar; Alves, Otavio; Bacon, David; Bertin, Emmanuel; Bocquet, Sebastian; Brooks, David; Rosell, Aurelio Carnero; Carretero, Jorge; Cawthon, Ross; da Costa, Luiz; Pereira, Maria Elidaiana da Silva; De Vicente, Juan; Desai, Shantanu; Doel, Peter; Everett, Spencer; Flaugher, Brenna; Friedel, Douglas; Frieman, Josh; Gatti, Marco; Gaztanaga, Enrique; Giannini, Giulia; Gutierrez, Gaston; Hinton, Samuel; Hollowood, Devon L.; James, David; Jeffrey, Niall; Kuehn, Kyler; Lahav, Ofer; Lee, Sujeong; Marshall, Jennifer; Mena-Fernández, Juan; Mohr, Joe; Myles, Justin; Ogando, Ricardo; Malagón, Andrés Plazas; Roodman, Aaron; Sanchez, Eusebio; Sevilla, Ignacio; Smith, Mathew; Soares-Santos, Marcelle; Suchyta, Eric; Swanson, Molly; Tarle, Gregory; Weaverdyck, Noah; Weller, Jochen; Wiseman, Philip
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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.
Comment: 16 pages, 9 figures. Accepted for publication in MNRAS
Comment: 16 pages, 9 figures. Accepted for publication in MNRAS