The Bulletin of The Korean Astronomical Society (천문학회보)
- Volume 42 Issue 1
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- Pages.52.2-53
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- 2017
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- 1226-2692(pISSN)
Post-reionization Kinetic Sunyaev-Zel'dovich Effect in Illustris Simulation
- Park, Hyunbae (Korea Astronomy and Space science Institute) ;
- Sabiu, Cristiano (Korea Astronomy and Space science Institute) ;
- Li, Xiao-dong (Korea Institute for Advanced Study) ;
- Park, Changbom (Korea Institute for Advanced Study) ;
- Kim, Juhan (Korea Institute for Advanced Study)
- Published : 2017.04.10
Abstract
We develop a methodology to use the redshift dependence of the galaxy 2-point correlation function (2pCF) as a probe of cosmological parameters. The positions of galaxies in comoving Cartesian space varies under different cosmological parameter choices, inducing a redshift-dependent scaling in the galaxy distribution. This geometrical distortion can be observed as a redshift-dependent rescaling in the measured 2pCF. The shape of the 2pCF exhibits a significant redshift evolution when the galaxy sample is analyzed under a cosmology differing from the true, simulated one. Other contributions, including the gravitational growth of structure, galaxy bias, and the redshift space distortions, do not produce large redshift evolution in the shape. We show that one can make use of this geometrical distortion to constrain the values of cosmological parameters governing the expansion history of the universe. This method could be applicable to future large scale structure surveys, especially photometric surveys such as DES, LSST, to derive tight cosmological constraints. This work is a continuation of our previous works as a strategy to constrain cosmological parameters using redshift-invariant physical quantities.
Keywords