hmf.halos.mass_definitions.FOF.halo_density

FOF.halo_density(z=0, cosmo=FlatLambdaCDM(name="Planck15", H0=67.7 km / (Mpc s), Om0=0.307, Tcmb0=2.725 K, Neff=3.05, m_nu=[0.   0.   0.06] eV, Ob0=0.0486))

The density of halos under this mass definition.

Note that for FoF halos, this is very approximate. We follow [1] and define \(rho_{FOF} = 9/(2\pi b^3) \rho_m\), with b the linking length. This assumes all groups are spherical and singular isothermal spheres.

References

1

White, Martin, Lars Hernquist, and Volker Springel. “The Halo Model and Numerical Simulations.” The Astrophysical Journal 550, no. 2 (April 2001): L129–32. https://doi.org/10.1086/319644.