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Title: Dissecting the thermal Sunyaev-Zeldovich-gravitational lensing cross-correlation with hydrodynamical simulations

Abstract

We use the cosmo-OWLS suite of cosmological hydrodynamical simulations, which includes different galactic feedback models, to predict the cross-correlation signal between weak gravitational lensing and the thermal Sunyaev-Zeldovich (tSZ) y-parameter. The predictions are compared to the recent detection reported by van Waerbeke and collaborators. The simulations reproduce the weak lensing-tSZ cross-correlation, ξ{sub yκ}(θ), well. The uncertainty arising from different possible feedback models appears to be important on small scales only (0θ ∼< 1 arcmin), while the amplitude of the correlation on all scales is sensitive to cosmological parameters that control the growth rate of structure (such as σ{sub 8}, Ω{sub m} and Ω{sub b}). This study confirms our previous claim (in Ma et al.) that a significant proportion of the signal originates from the diffuse gas component in low-mass (M{sub halo} ∼< 10{sup 14} M{sub ⊙}) clusters as well as from the region beyond the virial radius. We estimate that approximately 20% of the detected signal comes from low-mass clusters, which corresponds to about 30% of the baryon density of the Universe. The simulations also suggest that more than half of the baryons in the Universe are in the form of diffuse gas outside halos (∼> 5 times the virial radius) which is not hot ormore » dense enough to produce a significant tSZ signal or be observed by X-ray experiments. Finally, we show that future high-resolution tSZ-lensing cross-correlation observations will serve as a powerful tool for discriminating between different galactic feedback models.« less

Authors:
; ; ;  [1]; ;  [2];  [3]
  1. Department of Physics and Astronomy, University of British Columbia, Vancouver, V6T 1Z1, BC (Canada)
  2. Astrophysics Research Institute, Liverpool John Moores University, Liverpool, L3 5RF (United Kingdom)
  3. Astrophysics and Cosmology Research Unit, School of Chemistry and Physics, University of KwaZulu-Natal, Durban (South Africa)
Publication Date:
OSTI Identifier:
22525231
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2015; Journal Issue: 10; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; APPROXIMATIONS; BARYONS; COMPARATIVE EVALUATIONS; CORRELATIONS; COSMOLOGY; DENSITY; GALAXIES; GRAVITATIONAL LENSES; MASS; RESOLUTION; UNIVERSE; X RADIATION

Citation Formats

Hojjati, Alireza, Harnois-Deraps, Joachim, Waerbeke, Ludovic Van, Hinshaw, Gary, McCarthy, Ian G., Brun, Amandine M.C. Le, and Ma, Yin-Zhe, E-mail: ahojjati@phas.ubc.ca, E-mail: i.g.mccarthy@ljmu.ac.uk, E-mail: jharno@cita.utoronto.ca, E-mail: mayinzhe@manchester.ac.uk, E-mail: waerbeke@phas.ubc.ca, E-mail: hinshaw@phas.ubc.ca, E-mail: amandine.le-brun@cea.fr. Dissecting the thermal Sunyaev-Zeldovich-gravitational lensing cross-correlation with hydrodynamical simulations. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/10/047.
Hojjati, Alireza, Harnois-Deraps, Joachim, Waerbeke, Ludovic Van, Hinshaw, Gary, McCarthy, Ian G., Brun, Amandine M.C. Le, & Ma, Yin-Zhe, E-mail: ahojjati@phas.ubc.ca, E-mail: i.g.mccarthy@ljmu.ac.uk, E-mail: jharno@cita.utoronto.ca, E-mail: mayinzhe@manchester.ac.uk, E-mail: waerbeke@phas.ubc.ca, E-mail: hinshaw@phas.ubc.ca, E-mail: amandine.le-brun@cea.fr. Dissecting the thermal Sunyaev-Zeldovich-gravitational lensing cross-correlation with hydrodynamical simulations. United States. doi:10.1088/1475-7516/2015/10/047.
Hojjati, Alireza, Harnois-Deraps, Joachim, Waerbeke, Ludovic Van, Hinshaw, Gary, McCarthy, Ian G., Brun, Amandine M.C. Le, and Ma, Yin-Zhe, E-mail: ahojjati@phas.ubc.ca, E-mail: i.g.mccarthy@ljmu.ac.uk, E-mail: jharno@cita.utoronto.ca, E-mail: mayinzhe@manchester.ac.uk, E-mail: waerbeke@phas.ubc.ca, E-mail: hinshaw@phas.ubc.ca, E-mail: amandine.le-brun@cea.fr. Thu . "Dissecting the thermal Sunyaev-Zeldovich-gravitational lensing cross-correlation with hydrodynamical simulations". United States. doi:10.1088/1475-7516/2015/10/047.
@article{osti_22525231,
title = {Dissecting the thermal Sunyaev-Zeldovich-gravitational lensing cross-correlation with hydrodynamical simulations},
author = {Hojjati, Alireza and Harnois-Deraps, Joachim and Waerbeke, Ludovic Van and Hinshaw, Gary and McCarthy, Ian G. and Brun, Amandine M.C. Le and Ma, Yin-Zhe, E-mail: ahojjati@phas.ubc.ca, E-mail: i.g.mccarthy@ljmu.ac.uk, E-mail: jharno@cita.utoronto.ca, E-mail: mayinzhe@manchester.ac.uk, E-mail: waerbeke@phas.ubc.ca, E-mail: hinshaw@phas.ubc.ca, E-mail: amandine.le-brun@cea.fr},
abstractNote = {We use the cosmo-OWLS suite of cosmological hydrodynamical simulations, which includes different galactic feedback models, to predict the cross-correlation signal between weak gravitational lensing and the thermal Sunyaev-Zeldovich (tSZ) y-parameter. The predictions are compared to the recent detection reported by van Waerbeke and collaborators. The simulations reproduce the weak lensing-tSZ cross-correlation, ξ{sub yκ}(θ), well. The uncertainty arising from different possible feedback models appears to be important on small scales only (0θ ∼< 1 arcmin), while the amplitude of the correlation on all scales is sensitive to cosmological parameters that control the growth rate of structure (such as σ{sub 8}, Ω{sub m} and Ω{sub b}). This study confirms our previous claim (in Ma et al.) that a significant proportion of the signal originates from the diffuse gas component in low-mass (M{sub halo} ∼< 10{sup 14} M{sub ⊙}) clusters as well as from the region beyond the virial radius. We estimate that approximately 20% of the detected signal comes from low-mass clusters, which corresponds to about 30% of the baryon density of the Universe. The simulations also suggest that more than half of the baryons in the Universe are in the form of diffuse gas outside halos (∼> 5 times the virial radius) which is not hot or dense enough to produce a significant tSZ signal or be observed by X-ray experiments. Finally, we show that future high-resolution tSZ-lensing cross-correlation observations will serve as a powerful tool for discriminating between different galactic feedback models.},
doi = {10.1088/1475-7516/2015/10/047},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 10,
volume = 2015,
place = {United States},
year = {2015},
month = {10}
}