#
waynehu

## Professor,
Department of Astronomy and Astrophysics

University of Chicago

# 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

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 &sigma_{8}=0.8, and the mass is assumed to be virial mass in *h*^{-1}M_{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