Halo Mass Conversion

Wayne Hu & Andrey Kravtsov

Driver and fitting routines for converting halo mass definitions from one spherical overdensity to another assuming an NFW density profile

• massconvert.f

Inputs: original mass M_&Delta and overdensity &Delta and concentration c=r_&Delta /r_s and the desired target overdensity &Delta_new. Overdensity may be with respect to mean or critical so long as the target definition is defined in the same way. If c < 0, a Bullock et al default in a ΛCDM cosmology with &sigma₈=0.8, and the mass is assumed to be virial mass in h^-1M_s. (1/14/11: I/O swap between inputing the old vs new concentration fixed pointed out by Yin Li)

Outputs: M_Δnew mass at the target overdensity &Delta_new

References

[1] ''Sample Variance Considerations for Cluster Surveys,'' Hu & Kravtsov (2003) ApJ, 584, 702, astro-ph/0203169