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Title: First detection of cosmic microwave background lensing and Lyman- α forest bispectrum

Abstract

We present the first detection of a correlation between the Lyman-α forest and cosmic microwave background gravitational lensing. For each Lyman-α forest in SDSS-III/BOSS DR12, we correlate the one-dimensional power spectrum with the cosmic microwave background lensing convergence on the same line of sight from Planck. This measurement constitutes a position-dependent power spectrum, or a squeezed bispectrum, and quantifies the nonlinear response of the Lyman-α forest power spectrum to a large-scale overdensity. The signal is measured at 5σ and is consistent with the expectation of the standard ΛCDM cosmological model. We measure the linear bias of the Lyman-α forest with respect to the dark matter distribution and constrain a combination of nonlinear terms including the nonlinear bias. This new observable provides a consistency check for the Lyman-α forest as a large-scale structure probe and tests our understanding of the relation between intergalactic gas and dark matter. In the future, it could be used to test hydrodynamical simulations and calibrate the relation between the Lyman-α forest and dark matter.

Authors:
 [1];  [2];  [1];  [1];  [3];  [2];  [1]
  1. Univ. Paris Diderot, Paris Cedex (France)
  2. Princeton Univ., Princeton, NJ (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1398395
DOE Contract Number:  
AC02-05CH11231
Resource Type:
Journal Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Volume: 94; Journal Issue: 10; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Doux, Cyrille, Schaan, Emmanuel, Aubourg, Eric, Ganga, Ken, Lee, Khee -Gan, Spergel, David N., and Treguer, Julien. First detection of cosmic microwave background lensing and Lyman-α forest bispectrum. United States: N. p., 2016. Web. doi:10.1103/PhysRevD.94.103506.
Doux, Cyrille, Schaan, Emmanuel, Aubourg, Eric, Ganga, Ken, Lee, Khee -Gan, Spergel, David N., & Treguer, Julien. First detection of cosmic microwave background lensing and Lyman-α forest bispectrum. United States. doi:10.1103/PhysRevD.94.103506.
Doux, Cyrille, Schaan, Emmanuel, Aubourg, Eric, Ganga, Ken, Lee, Khee -Gan, Spergel, David N., and Treguer, Julien. Wed . "First detection of cosmic microwave background lensing and Lyman-α forest bispectrum". United States. doi:10.1103/PhysRevD.94.103506. https://www.osti.gov/servlets/purl/1398395.
@article{osti_1398395,
title = {First detection of cosmic microwave background lensing and Lyman-α forest bispectrum},
author = {Doux, Cyrille and Schaan, Emmanuel and Aubourg, Eric and Ganga, Ken and Lee, Khee -Gan and Spergel, David N. and Treguer, Julien},
abstractNote = {We present the first detection of a correlation between the Lyman-α forest and cosmic microwave background gravitational lensing. For each Lyman-α forest in SDSS-III/BOSS DR12, we correlate the one-dimensional power spectrum with the cosmic microwave background lensing convergence on the same line of sight from Planck. This measurement constitutes a position-dependent power spectrum, or a squeezed bispectrum, and quantifies the nonlinear response of the Lyman-α forest power spectrum to a large-scale overdensity. The signal is measured at 5σ and is consistent with the expectation of the standard ΛCDM cosmological model. We measure the linear bias of the Lyman-α forest with respect to the dark matter distribution and constrain a combination of nonlinear terms including the nonlinear bias. This new observable provides a consistency check for the Lyman-α forest as a large-scale structure probe and tests our understanding of the relation between intergalactic gas and dark matter. In the future, it could be used to test hydrodynamical simulations and calibrate the relation between the Lyman-α forest and dark matter.},
doi = {10.1103/PhysRevD.94.103506},
journal = {Physical Review D},
issn = {2470-0010},
number = 10,
volume = 94,
place = {United States},
year = {2016},
month = {11}
}

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