Journal
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
Volume 72, Issue 2, Pages -Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pasj/psz147
Keywords
cosmology: observations; galaxies: clusters: general; galaxies: clusters: intracluster medium; large-scale structure of universe
Categories
Funding
- World Premier International Research Center Initiative (WPI), MEXT, Japan
- JSPS KAKENHI [JP15H05896, JP15K21733, JP16K17684, JP18H04348]
- Ministry of Education, Culture, Sports, Science and Technology (MEXT)
- Japan Society for the Promotion of Science (JSPS)
- Toray Science Foundation
- NAOJ
- Kavli IPMU
- KEK
- ASIAA
- Princeton University
- Japan Science and Technology Agency (JST)
- Japanese Cabinet Office
- National Aeronautics and Space Administration [NNX08AR22G]
- National Science Foundation [AST-1238877]
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The thermal Sunyaev-Zeldovich (tSZ) power spectrum is a powerful probe of the present-day amplitude of matter density fluctuations, and has been measured up to l approximate to 10(3) from the Planck data. The largest systematic uncertainty in the interpretation of this data is the so-called mass bias parameter B, which relates the true halo mass to the mass proxy used by the Planck team as M-500c(Planck) = M-500c(true)/B. Since the power spectrum of the cosmic weak lensing shear is also sensitive to the amplitude of matter density fluctuations via S-8 sigma(8)Omega(alpha)(m) with alpha similar to 0.5, we can break the degeneracy between the mass bias and the cosmological parameters by combining the tSZ and cosmic shear power spectra. In this paper, we perform a joint likelihood analysis of the tSZ power spectrum from Planck and the cosmic shear power spectrum from Subaru Hyper Suprime-Cam. Our analysis does not use the primordial cosmic microwave background (CMB) information. We obtain a new constraint on the mass bias as B = 1.37(-0.23)(+0.15) or (1 - b) = B-1 = 0.73(-0.13)(+0.08) (68% confidence limit), for alpha(8) < 0.9. This value of B is lower than that needed to reconcile the tSZ data with the primordial CMB and CMB lensing data, i.e., B= 1.64 +/- 0.19, but is consistent with the mass bias expected from hydrodynamical simulations, B = 1.28 +/- 0.20. Thus our results indicate that the mass bias is consistent with the non-thermal pressure support from mass accretion of galaxy clusters via the cosmic structure formation, and that the cosmologies inferred from the tSZ and the cosmic shear are consistent with each other.
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