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Title: Weak lensing of intensity mapping: The cosmic infrared background

Abstract

Gravitational lensing deflects the paths of cosmic infrared background (CIB) photons, leaving a measurable imprint on CIB maps. The resulting statistical anisotropy can be utilized to reconstruct the matter distribution out to the redshifts of CIB sources. To this end, we generalize the cosmic microwave background (CMB) lensing quadratic estimator to any weakly non-Gaussian source field, by deriving the optimal lensing weights. We point out the additional noise and bias caused by the non-Gaussianity and the “self-lensing” of the source field. We propose methods to reduce, subtract, or model these non-Gaussianities. We demonstrate that CIB lensing should be detectable with Planck data and detectable at high significance for future CMB experiments like CCAT-Prime. The CIB thus constitutes a novel source image for lensing studies, providing constraints on the amplitude of structure at intermediate redshifts between galaxies and the CMB. CIB lensing measurements will also give valuable information on the star-formation history in the Universe, constraining CIB halo models beyond the CIB power spectrum. By laying out a detailed treatment of lens reconstruction from a weakly non-Gaussian source field, this report constitutes a stepping stone toward lens reconstruction from continuum or line intensity mapping data, such as the Lyman-alpha emission, absorption,more » and the 21 cm radiation.« less

Authors:
 [1];  [2];  [3]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States); Princeton Univ., NJ (United States)
  2. Univ. of California, Berkeley, CA (United States)
  3. Princeton Univ., NJ (United States); Flatiron Inst., New York, NY (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1544264
Alternate Identifier(s):
OSTI ID: 1457497
Grant/Contract Number:  
[AC02-05CH11231; NSF AST1311756]
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review D
Additional Journal Information:
[ Journal Volume: 97; Journal Issue: 12]; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Schaan, Emmanuel, Ferraro, Simone, and Spergel, David N. Weak lensing of intensity mapping: The cosmic infrared background. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.97.123539.
Schaan, Emmanuel, Ferraro, Simone, & Spergel, David N. Weak lensing of intensity mapping: The cosmic infrared background. United States. doi:10.1103/PhysRevD.97.123539.
Schaan, Emmanuel, Ferraro, Simone, and Spergel, David N. Wed . "Weak lensing of intensity mapping: The cosmic infrared background". United States. doi:10.1103/PhysRevD.97.123539. https://www.osti.gov/servlets/purl/1544264.
@article{osti_1544264,
title = {Weak lensing of intensity mapping: The cosmic infrared background},
author = {Schaan, Emmanuel and Ferraro, Simone and Spergel, David N.},
abstractNote = {Gravitational lensing deflects the paths of cosmic infrared background (CIB) photons, leaving a measurable imprint on CIB maps. The resulting statistical anisotropy can be utilized to reconstruct the matter distribution out to the redshifts of CIB sources. To this end, we generalize the cosmic microwave background (CMB) lensing quadratic estimator to any weakly non-Gaussian source field, by deriving the optimal lensing weights. We point out the additional noise and bias caused by the non-Gaussianity and the “self-lensing” of the source field. We propose methods to reduce, subtract, or model these non-Gaussianities. We demonstrate that CIB lensing should be detectable with Planck data and detectable at high significance for future CMB experiments like CCAT-Prime. The CIB thus constitutes a novel source image for lensing studies, providing constraints on the amplitude of structure at intermediate redshifts between galaxies and the CMB. CIB lensing measurements will also give valuable information on the star-formation history in the Universe, constraining CIB halo models beyond the CIB power spectrum. By laying out a detailed treatment of lens reconstruction from a weakly non-Gaussian source field, this report constitutes a stepping stone toward lens reconstruction from continuum or line intensity mapping data, such as the Lyman-alpha emission, absorption, and the 21 cm radiation.},
doi = {10.1103/PhysRevD.97.123539},
journal = {Physical Review D},
number = [12],
volume = [97],
place = {United States},
year = {2018},
month = {6}
}

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Cited by: 11 works
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