I'm trying to calculate the percentage of particles in a halo (representative of a galaxy cluster) that are also present in a subhalo of mass 4*(10**13) or greater (representative of any substructure that is resolvable through lensing). I'm finding that there are about 3 subhalos of that size per halo (mass 10**14 - 10**15) and that the percentage of particles in subhalos that also belong to halos is around 80%. This is much higher than I expected, so I'm wondering if my choice to identify halos by "Group" id or subhalos by "Subhalo" id was incorrect or if there should be more subhalos of mass 4*(10**13) or greater in each halo.
Dylan Nelson
11 Oct
Perhaps you are counting the central (i.e. first) subhalo in each halo? This will have the majority of the mass, and particles, but is not a satellite i.e. is probably not what you are thinking of as a "subhalo" (its center is the halo center). I'd suggest to re-do your calculation excluding the first subhalo of each halo.
Imogen Nagle
15 Oct
I did include the central one - thank you, and I think excluding it should work.
I'm trying to calculate the percentage of particles in a halo (representative of a galaxy cluster) that are also present in a subhalo of mass
4*(10**13)or greater (representative of any substructure that is resolvable through lensing). I'm finding that there are about 3 subhalos of that size per halo (mass10**14 - 10**15) and that the percentage of particles in subhalos that also belong to halos is around 80%. This is much higher than I expected, so I'm wondering if my choice to identify halos by "Group" id or subhalos by "Subhalo" id was incorrect or if there should be more subhalos of mass4*(10**13)or greater in each halo.Perhaps you are counting the central (i.e. first) subhalo in each halo? This will have the majority of the mass, and particles, but is not a satellite i.e. is probably not what you are thinking of as a "subhalo" (its center is the halo center). I'd suggest to re-do your calculation excluding the first subhalo of each halo.
I did include the central one - thank you, and I think excluding it should work.