Weak lensing of intensity mapping: The cosmic infrared background

Schaan, Emmanuel; Ferraro, Simone; Spergel, David N.

doi:10.1103/PhysRevD.97.123539

Weak lensing of intensity mapping: The cosmic infrared background

Journal Article · Wed Jun 27 00:00:00 EDT 2018 · Physical Review. D.

DOI:https://doi.org/10.1103/PhysRevD.97.123539· OSTI ID:1544264

Schaan, Emmanuel ^[1]; Ferraro, Simone ^[2]; Spergel, David N. ^[3]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States); Princeton Univ., NJ (United States)
Univ. of California, Berkeley, CA (United States)
Princeton Univ., NJ (United States); Flatiron Inst., New York, NY (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1544264

Alternate ID(s):: OSTI ID: 1771951
OSTI ID: 1457497

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 12 Vol. 97; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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