The Bulletin of The Korean Astronomical Society (천문학회보)
- Volume 43 Issue 2
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- Pages.43.2-43.2
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- 2018
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- 1226-2692(pISSN)
Pair-wise peculiar velocity and the redshift space distortion
- Park, Hyunbae (Korea Astronomy and Space Science Institute) ;
- Tonegawa, Motonari (Korean Institute for Advance Study) ;
- Zheng, Yi (Korean Institute for Advance Study) ;
- Sabiu, Cris (Yonsei University) ;
- Li, Xiao-dong (Korean Institute for Advance Study) ;
- Park, Changbom (Korean Institute for Advance Study)
- Published : 2018.10.10
Abstract
The line-of-sight component in the relative motion of galaxy pairs sources the redshift space distortion (RSD) in galaxy surveys. By knowing the probability density function (PDF) of pair-wise motions and projecting it to the line-of-sight direction, one can compute the RSD effect precisely. I present the pair-velocity PDF of dark matter and galaxies in the Horizon-run 4 simulation. I also derive a model motivated by the perturbation theory which fits the results fairly well. I also discuss the application of the model in constraining the cosmology.
Keywords