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Mass and Spatial Distributions of Subhaloes in ΛCDM Cosmological Simulations

Published online by Cambridge University Press:  01 August 2006

P. Nurmi ,
P. Heinämäki ,
J. Holopainen ,
P. Pihajoki ,
E. Saar ,
M. Einasto  and
J. Einasto
P. Nurmi
Affiliation:
Tuorla Observatory, University of Turku, Väisäläntie 20, FI-21500 Piikkiö, Finland email: pasnurmi@utu.fi
P. Heinämäki
Affiliation:
Tuorla Observatory, University of Turku, Väisäläntie 20, FI-21500 Piikkiö, Finland email: pasnurmi@utu.fi
J. Holopainen
Affiliation:
Tuorla Observatory, University of Turku, Väisäläntie 20, FI-21500 Piikkiö, Finland email: pasnurmi@utu.fi
P. Pihajoki
Affiliation:
Tuorla Observatory, University of Turku, Väisäläntie 20, FI-21500 Piikkiö, Finland email: pasnurmi@utu.fi
E. Saar
Affiliation:
Tartu Observatory, Tõravere Tartumaa, 61602, Estonia
M. Einasto
Affiliation:
Tartu Observatory, Tõravere Tartumaa, 61602, Estonia
J. Einasto
Affiliation:
Tartu Observatory, Tõravere Tartumaa, 61602, Estonia
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Abstract

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We study subhalo populations surrounding massive dark matter haloes by using three AMIGA simulations each having different mass and spatial resolutions. Our analysis shows that the slope of the subhalo mass function has a value 0.9, which agrees with previous studies. The dependence of mass functions on redshift is the same for subhaloes and main haloes. In all simulations, combined subhalo masses are about 0.1-0.2 of main halo masses and this mass fraction increases slightly with redshift and the mass of the main halo. The distribution of mass fractions for subhaloes is close to Gaussian at z = 0 and differs slightly at earlier epochs. Spatial distribution of subhaloes as measured in units of virial radius Rvir of the main halo does not depend on redshift and follows r1/3 rule. Spatial distribution of all haloes surrounding main haloes continues up to 3 times Rvir with equal slope but lower amplitude. Beyond 16 times Rvir, the average distribution of haloes becomes uniform.

Keywords

Methods: n-body simulationsCosmology: miscellaneous-dark matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 127
Copyright
Copyright © International Astronomical Union 2007

References

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