TY - JOUR
T1 - Weak lensing of intensity mapping
T2 - The cosmic infrared background
AU - Schaan, Emmanuel
AU - Ferraro, Simone
AU - Spergel, David N.
N1 - Funding Information:
We are grateful to Marcelo Alvarez, Emanuele Castorina, Anthony Challinor, William Coulton, Olivier Doré, Simon Foreman, Chen He Heinrich, Daniel Lenz, Shirley Ho, Wayne Hu, Uroš Seljak, Blake Sherwin, Kendrick Smith, Alex van Engelen, Martin White, Michael Wilson, and Hong-Ming Zhu for useful conversations and comments. We thank the referee for useful comments. This work used resources of the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. E. S. is supported by the National Science Foundation Grant No. NSF AST1311756 and by the Chamberlain fellowship at Lawrence Berkeley National Laboratory. S. F. thanks the Miller Institute for Basic Research in Science at the University of California, Berkeley, for support. The Flatiron Institute is supported by the Simons Foundation.
Funding Information:
This work used resources of the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. E.S. is supported by the National Science Foundation Grant No. NSF AST1311756 and by the Chamberlain fellowship at Lawrence Berkeley National Laboratory. S.F. thanks the Miller Institute for Basic Research in Science at the University of California, Berkeley, for support. The Flatiron Institute is supported by the Simons Foundation.
Publisher Copyright:
© 2018 American Physical Society.
PY - 2018/6/15
Y1 - 2018/6/15
N2 - Gravitational lensing deflects the paths of cosmic infrared background (CIB) photons, leaving a measurable imprint on CIB maps. The resulting statistical anisotropy can be used 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 show 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 new 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 work 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.
AB - Gravitational lensing deflects the paths of cosmic infrared background (CIB) photons, leaving a measurable imprint on CIB maps. The resulting statistical anisotropy can be used 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 show 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 new 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 work 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.
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U2 - 10.1103/PhysRevD.97.123539
DO - 10.1103/PhysRevD.97.123539
M3 - Article
AN - SCOPUS:85049505740
SN - 2470-0010
VL - 97
JO - Physical Review D
JF - Physical Review D
IS - 12
M1 - 123539
ER -