The Gravitational Lensing Imprints of DES Y3 Superstructures on the CMB: A Matched Filtering Approach
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2024
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| 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 |
| author_facet | 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 |
| contents | $ $Low density cosmic voids gravitationally lens the cosmic microwave background (CMB), leaving a negative imprint on the CMB convergence $κ$. 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 $A_κ$, the amplitude of the observed lensing signal relative to the simulation template, obtaining $A_κ= 1.03 \pm 0.22$ ($4.6σ$ significance) for Voxel and $A_κ= 1.02 \pm 0.17$ ($5.9σ$ significance) for 2D voids, both consistent with $Λ$CDM expectations. We additionally invert the 2D void-finding process to identify superclusters in the projected density field, for which we measure $A_κ= 0.87 \pm 0.15$ ($5.9σ$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2404_18278 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Gravitational Lensing Imprints of DES Y3 Superstructures on the CMB: A Matched Filtering Approach 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 Cosmology and Nongalactic Astrophysics $ $Low density cosmic voids gravitationally lens the cosmic microwave background (CMB), leaving a negative imprint on the CMB convergence $κ$. 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 $A_κ$, the amplitude of the observed lensing signal relative to the simulation template, obtaining $A_κ= 1.03 \pm 0.22$ ($4.6σ$ significance) for Voxel and $A_κ= 1.02 \pm 0.17$ ($5.9σ$ significance) for 2D voids, both consistent with $Λ$CDM expectations. We additionally invert the 2D void-finding process to identify superclusters in the projected density field, for which we measure $A_κ= 0.87 \pm 0.15$ ($5.9σ$ 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. |
| title | The Gravitational Lensing Imprints of DES Y3 Superstructures on the CMB: A Matched Filtering Approach |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2404.18278 |