Volume 367, Number 1, February III 2001
|Page(s)||27 - 32|
|Published online||15 February 2001|
The mass of a halo
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA e-mail: firstname.lastname@example.org
Accepted: 17 November 2000
We discuss the different definitions of the mass of a halo in common use and how one may convert between them. Using N-body simulations we show that mass estimates based on spherical averages are much more tightly correlated with each other than with masses based on the number of particles in a halo. The mass functions pertaining to some different mass definitions are estimated and compared to the "universal form"of Jenkins et al. ([CITE]). Using a different simulation pipeline and a different cosmological model we show that the mass function is well fit by the Jenkins et al. ([CITE]) fitting function, strengthening the claim to universality made by those authors. We show that care must be taken to match the definitions of mass when using large N-body simulations to bootstrap scaling relations from smaller hydrodynamical runs to avoid observationally significant bias in the predictions for abundances of objects.
Key words: methods: N-body simulations
© ESO, 2001
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