Small-scale galaxy clustering in the EAGLE simulation

M. Celeste Artale; Susana E. Pedrosa; James W. Trayford; Tom Theuns; Daniel J. Farrow; Peder Norberg; Idit Zehavi; Richard G. Bower; Matthieu Schaller

doi:10.1093/mnras/stx1263

Small-scale galaxy clustering in the EAGLE simulation

M. Celeste Artale^*, Susana E. Pedrosa, James W. Trayford, Tom Theuns, Daniel J. Farrow, Peder Norberg, Idit Zehavi, Richard G. Bower, Matthieu Schaller

^*Corresponding author for this work

Institute of Cosmology & Gravitation

Research output: Contribution to journal › Article › peer-review

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Abstract

We study present-day galaxy clustering in the EAGLE cosmological hydrodynamical simulation. EAGLE's galaxy formation parameters were calibrated to reproduce the redshift z = 0.1 galaxy stellar mass function, and the simulation also reproduces galaxy colours well. The simulation volume is too small to correctly sample large-scale fluctuations and we therefore concentrate on scales smaller than a few mega parsecs.We find very good agreement with observed clustering measurements from the Galaxy And Mass Assembly (GAMA) survey, when galaxies are binned by stellar mass, colour or luminosity. However, low-mass red galaxies are clustered too strongly, which is at least partly due to limited numerical resolution. Apart from this limitation, we conclude that EAGLE galaxies inhabit similar dark matter haloes as observed GAMA galaxies, and that the radial distribution of satellite galaxies, as a function of stellar mass and colour, is similar to that observed as well.

Original language	English
Pages (from-to)	1771-1787
Number of pages	17
Journal	Monthly Notices of the Royal Astronomical Society
Volume	470
Issue number	2
Early online date	23 May 2017
DOIs	https://doi.org/10.1093/mnras/stx1263
Publication status	Published - 11 Sept 2017

Keywords

cosmology: theory
galaxies: evolution
galaxies: formation
galaxies: haloes
galaxies: statistics
large-scale structure of universe
UKRI
STFC
ST/F001166/1
ST/K00042X/1
ST/H008519/1
ST/L00075X/1
ST/P000541/1

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stx1263
This article has been accepted for publication in MNRAS ©: 2017 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
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title = "Small-scale galaxy clustering in the EAGLE simulation",

abstract = "We study present-day galaxy clustering in the EAGLE cosmological hydrodynamical simulation. EAGLE's galaxy formation parameters were calibrated to reproduce the redshift z = 0.1 galaxy stellar mass function, and the simulation also reproduces galaxy colours well. The simulation volume is too small to correctly sample large-scale fluctuations and we therefore concentrate on scales smaller than a few mega parsecs.We find very good agreement with observed clustering measurements from the Galaxy And Mass Assembly (GAMA) survey, when galaxies are binned by stellar mass, colour or luminosity. However, low-mass red galaxies are clustered too strongly, which is at least partly due to limited numerical resolution. Apart from this limitation, we conclude that EAGLE galaxies inhabit similar dark matter haloes as observed GAMA galaxies, and that the radial distribution of satellite galaxies, as a function of stellar mass and colour, is similar to that observed as well.",

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author = "Artale, {M. Celeste} and Pedrosa, {Susana E.} and Trayford, {James W.} and Tom Theuns and Farrow, {Daniel J.} and Peder Norberg and Idit Zehavi and Bower, {Richard G.} and Matthieu Schaller",

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AU - Artale, M. Celeste

AU - Pedrosa, Susana E.

AU - Trayford, James W.

AU - Theuns, Tom

AU - Farrow, Daniel J.

AU - Norberg, Peder

AU - Zehavi, Idit

AU - Bower, Richard G.

AU - Schaller, Matthieu

PY - 2017/9/11

Y1 - 2017/9/11

N2 - We study present-day galaxy clustering in the EAGLE cosmological hydrodynamical simulation. EAGLE's galaxy formation parameters were calibrated to reproduce the redshift z = 0.1 galaxy stellar mass function, and the simulation also reproduces galaxy colours well. The simulation volume is too small to correctly sample large-scale fluctuations and we therefore concentrate on scales smaller than a few mega parsecs.We find very good agreement with observed clustering measurements from the Galaxy And Mass Assembly (GAMA) survey, when galaxies are binned by stellar mass, colour or luminosity. However, low-mass red galaxies are clustered too strongly, which is at least partly due to limited numerical resolution. Apart from this limitation, we conclude that EAGLE galaxies inhabit similar dark matter haloes as observed GAMA galaxies, and that the radial distribution of satellite galaxies, as a function of stellar mass and colour, is similar to that observed as well.

AB - We study present-day galaxy clustering in the EAGLE cosmological hydrodynamical simulation. EAGLE's galaxy formation parameters were calibrated to reproduce the redshift z = 0.1 galaxy stellar mass function, and the simulation also reproduces galaxy colours well. The simulation volume is too small to correctly sample large-scale fluctuations and we therefore concentrate on scales smaller than a few mega parsecs.We find very good agreement with observed clustering measurements from the Galaxy And Mass Assembly (GAMA) survey, when galaxies are binned by stellar mass, colour or luminosity. However, low-mass red galaxies are clustered too strongly, which is at least partly due to limited numerical resolution. Apart from this limitation, we conclude that EAGLE galaxies inhabit similar dark matter haloes as observed GAMA galaxies, and that the radial distribution of satellite galaxies, as a function of stellar mass and colour, is similar to that observed as well.

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KW - galaxies: evolution

KW - galaxies: formation

KW - galaxies: haloes

KW - galaxies: statistics

KW - large-scale structure of universe

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KW - STFC

KW - ST/F001166/1

KW - ST/K00042X/1

KW - ST/H008519/1

KW - ST/L00075X/1

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JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

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ER -

Small-scale galaxy clustering in the EAGLE simulation

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Keywords

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