Evolution of matter and galaxy clustering in cosmological hydrodynamical simulations

Author:

Einasto Jaan123ORCID,Hütsi Gert4,Liivamägi Lauri-Juhan1,Park Changbom5,Kim Juhan5,Szapudi Istvan6,Einasto Maret1ORCID

Affiliation:

1. Tartu Observatory , Tõravere 61602, Estonia

2. Estonian Academy of Sciences , Tallinn 10130, Estonia

3. ICRANet , Piazza della Repubblica 10, I-65122 Pescara, Italy

4. National Institute of Chemical Physics and Biophysics , Tallinn 10143, Estonia

5. Korea Institute for Advanced Study , 85 Hoegi-ro, Dongdaemun-gu, Seoul 02455, Republic of Korea

6. Institute for Astronomy, University of Hawaii , 2680 Woodlawn Dr, Honolulu, HI 96822, USA

Abstract

ABSTRACT We quantify the evolution of matter and galaxy clustering in cosmological hydrodynamical simulations via correlation and bias functions of matter and galaxies. We use simulations TNG100 and TNG300 with epochs from z = 5 to z = 0. We calculate spatial correlation functions (CFs) of galaxies, ξ(r), for simulated galaxies and dark matter (DM) particles to characterize the evolving cosmic web. We find that bias parameters decrease during the evolution, confirming earlier results. Bias parameters of the lowest luminosity galaxies, b0, estimated from CFs are lower relative to CFs of particle density-limited clustered samples of DM. At low and medium luminosities, bias parameters of galaxies are equal, suggesting that dwarf galaxies reside in the same filamentary web as brighter galaxies. We find that bias parameters b0, estimated from CFs of clustered DM, agree with the expected values from the fraction of particles in the clustered population, b = 1/Fc. The cosmic web contains filamentary structures of various densities, and fractions of matter in the clustered and the unclustered populations are both less than unity. Thus, the CF amplitude of the clustered matter is always higher than that for all matter, i.e. bias parameter must be b > 1. Differences between CFs of galaxies and clustered DM suggest that these functions describe different properties of the cosmic web.

Funder

European Regional Development Fund

University of California

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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