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A correlation between spin parameter and dark matter halomass

Published online by Cambridge University Press:  20 January 2011

H. Wozniak ,
G. Hensler ,
A. Knebe  and
C. Power
A. Knebe
Affiliation:
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany
C. Power
Affiliation:
Department of Physics and Astronomy, University of Leicester, University Road, LE1 7RH, UK
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Abstract

Using a set of high-resolution dark matter only cosmological simulations we found acorrelation between the dark matter halo mass M and its spin parameterλ for objects forming at redshifts z > 10: thespin parameter decreases with increasing mass. However, halos forming at later times donot exhibit such a strong correlation, in agreement with the findings of previous studies.

While we presented such a correlation in a previous study using the Bullock etal. (2001) spin parameter defintion wenow defer to the classical definition showing that the results are independent of thedefinition.

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