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

Journal Article · · Monthly Notices of the Royal Astronomical Society
DOI:https://doi.org/10.1093/mnras/stx766· OSTI ID:1523831
 [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)

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.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1523831
Journal Information:
Monthly Notices of the Royal Astronomical Society, Vol. 469, Issue 1; ISSN 0035-8711
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 34 works
Citation information provided by
Web of Science

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Cited By (10)

Constraints from thermal Sunyaev-Zeldovich cluster counts and power spectrum combined with CMB text January 2017
Constraints from thermal Sunyaev-Zel’dovich cluster counts and power spectrum combined with CMB journal June 2018
The Simons Observatory: Science goals and forecasts text January 2018
Joint analysis of the thermal Sunyaev–Zeldovich effect and 2MASS galaxies: probing gas physics in the local Universe and beyond journal July 2018
Projected alignment of non-sphericities of stellar, gas, and dark matter distributions in galaxy clusters: analysis of the Horizon-AGN simulation journal April 2018
The Two-Halo Term in Stacked Thermal Sunyaev-Zel'dovich Measurements: Implications for Self-Similarity text January 2017
Dark energy constraints from the thermal Sunyaev–Zeldovich power spectrum journal March 2018
Projected alignment of non-sphericities of stellar, gas, and dark matter distributions in galaxy clusters: analysis of the Horizon-AGN simulation text January 2018
The Simons Observatory: Science goals and forecasts text January 2019
The Simons Observatory: science goals and forecasts journal February 2019

Figures / Tables (5)


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