... halos

Appendix is only available in electronic form at http://www.edpsciences.org

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... mass

In the following, we will refer to the mass as the virial mass i.e. that enclosed in a sphere with overdensity $\delta = \rho /\rho _{\rm crit}=178\cdot \Omega _{m}^{0.44}$ (Navarro et al. 2000).

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... halo

Halos have been identified using the friends of friends algorithm with a linking length l = 0.15, mean interparticle distances, with more than 8 particles.

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... SKID

http://www-hpcc.astro.washington.edu/tools/skid.html

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...$C_{\rm vir}$

We note however that $C_{\rm NFW}$is defined against R₂₀₀, the radius enclosing a sphere with overdensity equal to 200 times the critical density of the Universe, and not against $R_{\rm vir}$ as here; therefore, in our cosmological model, it is always $C_{\rm NFW}<C_{\rm vir}$. At z=0 our halo has $C_{\rm NFW} \sim 14$.

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... coordinates

Note that, since the disk is modelled in physical coordinates and embedded in the cosmological halo at redshifts z=2 and z=1, its thickness is larger than the value of the Plummer softening we use.

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