Unevolved Subhalo Mass Function

Class providing unevolved subhalo mass functions \(\mathrm{d}N/\mathrm{d}m\)—the mass spectrum of subhalos at the time they first fell into their host, before tidal stripping has reduced their mass. The unevolved subhalo mass function represents the initial conditions for subhalo evolution and is predicted from the extended Press-Schechter formalism or calibrated to N-body simulations. Both differential (per unit mass per host halo) and integrated (between two mass limits) forms are provided, as functions of the subhalo mass, host mass, and cosmic time.

Default implementation: unevolvedSubhaloMassFunctionGiocoli2008

Methods

differential → double precision

Return the differential unevolved subhalo mass function per halo for mass [\(\mathrm{M}_\odot\)] subhalos in massHost [\(\mathrm{M}_\odot\)] hosts at time [Gyr].

  • double precision, intent(in ) :: time, mass, massHost

integrated → double precision

Return the unevolved subhalo mass function per host at time [Gyr] in hosts of mass massHost [\(\mathrm{M}_\odot\)] integrated between massLow and massHigh [\(\mathrm{M}_\odot\)].

  • double precision, intent(in ) :: time, massLow, massHigh, massHost

unevolvedSubhaloMassFunctionGiocoli2008

The halo mass function is computed from the function given by Giocoli et al. (2008).

(Default implementation)

Parameters

  • [normalization] (default 0.21d0) — The parameter \(N_0\) in the Giocoli et al. (2008) unevolved subhalo mass function fit.

  • [exponent] (default 0.8d0) — The parameter \(\alpha\) in the Giocoli et al. (2008) unevolved subhalo mass function fit.