Exploring the non-Gaussianity of the cosmic infrared background and its weak gravitational lensing
Abstract
ABSTRACT Gravitational lensing deflects the paths of photons, altering the statistics of cosmic backgrounds and distorting their information content. We take the cosmic infrared background (CIB), which provides plentiful information about galaxy formation and evolution, as an example to probe the effect of lensing on non-Gaussian statistics. Using the Websky simulations, we first quantify the non-Gaussianity of the CIB, revealing additional detail on top of its well-measured power spectrum. To achieve this, we use needlet-like multipole-band filters to calculate the variance and higher-point correlations. Using our simulations, we show the two-, three- and four-point spectra, and compare our calculated power spectra and bispectra to Planck values. We then lens the CIB, shell-by-shell with corresponding convergence maps, to capture the broad redshift extent of both the CIB and its lensing convergence. The lensing of the CIB changes the three- and four-point functions by a few tens of per cent at large scales, unlike with the power spectrum, which changes by less than two per cent. We expand our analyses to encompass the full intensity probability distribution functions (PDFs) involving all n-point correlations as a function of scale. In particular, we use the relative entropy between lensed and unlensed PDFs to create a spectrum of templatesmore »
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 2325366
- Grant/Contract Number:
- FOA-0002424
- Resource Type:
- Published Article
- Journal Name:
- Monthly Notices of the Royal Astronomical Society
- Additional Journal Information:
- Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 529 Journal Issue: 3; Journal ID: ISSN 0035-8711
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
Citation Formats
Lee, Jaemyoung, Bond, J. Richard, Motloch, Pavel, van Engelen, Alexander, and Stein, George. Exploring the non-Gaussianity of the cosmic infrared background and its weak gravitational lensing. United Kingdom: N. p., 2024.
Web. doi:10.1093/mnras/stae605.
Lee, Jaemyoung, Bond, J. Richard, Motloch, Pavel, van Engelen, Alexander, & Stein, George. Exploring the non-Gaussianity of the cosmic infrared background and its weak gravitational lensing. United Kingdom. https://doi.org/10.1093/mnras/stae605
Lee, Jaemyoung, Bond, J. Richard, Motloch, Pavel, van Engelen, Alexander, and Stein, George. Wed .
"Exploring the non-Gaussianity of the cosmic infrared background and its weak gravitational lensing". United Kingdom. https://doi.org/10.1093/mnras/stae605.
@article{osti_2325366,
title = {Exploring the non-Gaussianity of the cosmic infrared background and its weak gravitational lensing},
author = {Lee, Jaemyoung and Bond, J. Richard and Motloch, Pavel and van Engelen, Alexander and Stein, George},
abstractNote = {ABSTRACT Gravitational lensing deflects the paths of photons, altering the statistics of cosmic backgrounds and distorting their information content. We take the cosmic infrared background (CIB), which provides plentiful information about galaxy formation and evolution, as an example to probe the effect of lensing on non-Gaussian statistics. Using the Websky simulations, we first quantify the non-Gaussianity of the CIB, revealing additional detail on top of its well-measured power spectrum. To achieve this, we use needlet-like multipole-band filters to calculate the variance and higher-point correlations. Using our simulations, we show the two-, three- and four-point spectra, and compare our calculated power spectra and bispectra to Planck values. We then lens the CIB, shell-by-shell with corresponding convergence maps, to capture the broad redshift extent of both the CIB and its lensing convergence. The lensing of the CIB changes the three- and four-point functions by a few tens of per cent at large scales, unlike with the power spectrum, which changes by less than two per cent. We expand our analyses to encompass the full intensity probability distribution functions (PDFs) involving all n-point correlations as a function of scale. In particular, we use the relative entropy between lensed and unlensed PDFs to create a spectrum of templates that can allow estimation of lensing. The underlying CIB model is missing the important role of star bursting, which we test by adding a stochastic lognormal term to the intensity distributions. The novel aspects of our filtering and lensing pipeline should prove useful for any radiant background, including line intensity maps.},
doi = {10.1093/mnras/stae605},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 3,
volume = 529,
place = {United Kingdom},
year = {Wed Feb 28 00:00:00 EST 2024},
month = {Wed Feb 28 00:00:00 EST 2024}
}
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