TY - JOUR

T1 - Deciphering cosmological information from redshift surveys of high-z objects - The cosmological light-cone effect and redshift-space distortion

AU - Suto, Yasushi

AU - Magira, Hiromitsu

AU - Jing, Y. P.

AU - Matsubara, Takahiko

AU - Yamamoto, Kazuhiro

N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.

PY - 1999

Y1 - 1999

N2 - The three-dimensional distribution of astronomical objects observed in redshift space significantly differs from the true distribution, since the distance to each object cannot be determined by its redshift z only; for z ≪ 1 the peculiar velocity field contaminates the true recession velocity of the Hubble flow, while the true distance for objects with z ≳ 1 sensitively depends on the (unknown and thus assumed) cosmological parameters. This hampers the effort to understand the true distribution of the large-scale structure of the universe. In addition, all cosmological observations are carried out on a light-cone, the null hypersurface of an observer at z = 0. This implies that their intrinsic properties and clustering statistics should change even within the survey volume. Therefore, a proper comparison taking account of the light-cone effect is important to extract any cosmological information from redshift catalogues, especially for z ≳ 1. We present recent theoretical developments on the two effects - the cosmological light-cone effect and the cosmological redshift-space distortion - that should play key roles in observational cosmology in the 21st century.

AB - The three-dimensional distribution of astronomical objects observed in redshift space significantly differs from the true distribution, since the distance to each object cannot be determined by its redshift z only; for z ≪ 1 the peculiar velocity field contaminates the true recession velocity of the Hubble flow, while the true distance for objects with z ≳ 1 sensitively depends on the (unknown and thus assumed) cosmological parameters. This hampers the effort to understand the true distribution of the large-scale structure of the universe. In addition, all cosmological observations are carried out on a light-cone, the null hypersurface of an observer at z = 0. This implies that their intrinsic properties and clustering statistics should change even within the survey volume. Therefore, a proper comparison taking account of the light-cone effect is important to extract any cosmological information from redshift catalogues, especially for z ≳ 1. We present recent theoretical developments on the two effects - the cosmological light-cone effect and the cosmological redshift-space distortion - that should play key roles in observational cosmology in the 21st century.

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U2 - 10.1143/ptps.133.183

DO - 10.1143/ptps.133.183

M3 - Article

AN - SCOPUS:0033244633

SP - 183

EP - 210

JO - Progress of Theoretical Physics

JF - Progress of Theoretical Physics

SN - 0033-068X

IS - 133

ER -