Public Data Access Overview / Discussion Forum

Hi Dylan,

At z=0, some zoom clusters' low resolution contamination seem too high?

snapNum = 99

GroupContaminationFracByNumPart = il.groupcat.loadHalos(basePath,snapNum,fields='GroupContaminationFracByNumPart')
GroupContaminationFracByMass = il.groupcat.loadHalos(basePath,snapNum,fields='GroupContaminationFracByMass')

GroupPrimaryZoomTarget = il.groupcat.loadHalos(basePath,snapNum,fields='GroupPrimaryZoomTarget')
cut_cluster = GroupPrimaryZoomTarget > 0

np.sum(GroupContaminationFracByNumPart[cut_cluster] >= 1e-3)
2

np.sum(GroupContaminationFracByMass[cut_cluster] >= 0.1)
1

I am not very sure whether these zoom clusters are reliable.

Thank you and best wishes.

The corresponding plot is Figure A1 of Nelson+2024.

Certainly there is a range of contamination, and some halos have more. You are welcome to filter them out in analysis, by defining some threshold. Alternatively, you can leave them all in, and just keep in mind that they could correspond to outliers on plots (they are too few in number to affect e.g. median trends or results).

Got it. Thanks.