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Title: Cosmological constraints from thermal Sunyaev–Zeldovich power spectrum revisited

Abstract

Thermal Sunyaev-Zeldovich (tSZ) power spectrum is one of the most sensitive methods to constrain cosmological parameters, scaling as the amplitude σ$$8\atop{8}$$. It is determined by the integral over the halo mass function multiplied by the total pressure content of clusters and further convolved by the cluster gas pressure profile. It has been shown that various feedback effects can change significantly the pressure profile, possibly even pushing the gas out to the virial radius and beyond, strongly affecting the tSZ power spectrum at high l. Energetics arguments and SZ-halo mass scaling relations suggest feedback is unlikely to significantly change the total pressure content, making the low l tSZ power spectrum more robust against feedback effects. Moreover, the separation between the cosmic infrared background and tSZ is more reliable at low l. Low l modes are however probing very small volumes, giving rise to very large non-Gaussian sampling variance errors. By computing the trispectrum contribution, we identify 90 < l < 350 as the minimum variance scale where the combined error is minimized. We find constraints on σ8 by marginalizing over the feedback nuisance parameter, obtaining σ8=0.820$$+0.021\atop{-0.009}$$(Ωm/0.31)0.4 when fixing other parameters to Planck cosmology values. Our results indicate that it is possible to obtain competitive cosmological constraints from tSZ without cluster redshift information and that the current tSZ power spectrum shows no evidence for a low amplitude of σ8.

Authors:
 [1];  [2]
  1. Univ. of California, Berkeley, CA (United States)
  2. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1523831
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Volume: 469; Journal Issue: 1; Journal ID: ISSN 0035-8711
Publisher:
Royal Astronomical Society
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS

Citation Formats

Horowitz, B., and Seljak, U. Cosmological constraints from thermal Sunyaev–Zeldovich power spectrum revisited. United States: N. p., 2017. Web. doi:10.1093/mnras/stx766.
Horowitz, B., & Seljak, U. Cosmological constraints from thermal Sunyaev–Zeldovich power spectrum revisited. United States. https://doi.org/10.1093/mnras/stx766
Horowitz, B., and Seljak, U. Wed . "Cosmological constraints from thermal Sunyaev–Zeldovich power spectrum revisited". United States. https://doi.org/10.1093/mnras/stx766. https://www.osti.gov/servlets/purl/1523831.
@article{osti_1523831,
title = {Cosmological constraints from thermal Sunyaev–Zeldovich power spectrum revisited},
author = {Horowitz, B. and Seljak, U.},
abstractNote = {Thermal Sunyaev-Zeldovich (tSZ) power spectrum is one of the most sensitive methods to constrain cosmological parameters, scaling as the amplitude σ$8\atop{8}$. It is determined by the integral over the halo mass function multiplied by the total pressure content of clusters and further convolved by the cluster gas pressure profile. It has been shown that various feedback effects can change significantly the pressure profile, possibly even pushing the gas out to the virial radius and beyond, strongly affecting the tSZ power spectrum at high l. Energetics arguments and SZ-halo mass scaling relations suggest feedback is unlikely to significantly change the total pressure content, making the low l tSZ power spectrum more robust against feedback effects. Moreover, the separation between the cosmic infrared background and tSZ is more reliable at low l. Low l modes are however probing very small volumes, giving rise to very large non-Gaussian sampling variance errors. By computing the trispectrum contribution, we identify 90 < l < 350 as the minimum variance scale where the combined error is minimized. We find constraints on σ8 by marginalizing over the feedback nuisance parameter, obtaining σ8=0.820$+0.021\atop{-0.009}$(Ωm/0.31)0.4 when fixing other parameters to Planck cosmology values. Our results indicate that it is possible to obtain competitive cosmological constraints from tSZ without cluster redshift information and that the current tSZ power spectrum shows no evidence for a low amplitude of σ8.},
doi = {10.1093/mnras/stx766},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 1,
volume = 469,
place = {United States},
year = {Wed Mar 29 00:00:00 EDT 2017},
month = {Wed Mar 29 00:00:00 EDT 2017}
}

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Cited by: 34 works
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Figures / Tables:

Figure 1 Figure 1: A comparison of our model (solid green) at 146 GHz, simulations of Dolag et al. (2016, blue dotted) and the analytic model of Hill & Pajer (2013, red dotted) and Battaglia et al. (2012, yellow dot–dashed), which use different pressure profiles than our model. We have scaled allmore » power spectra to the fiducial cosmology with σ 8 = 0.815« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.