Subhalos without merger tree

Yun-Hsin Hsu
  • 19 Jul

Hi Dylan,

Could you give me some advice about dealing with these subhalos?
Recently I encountered some subhalos without progenitor and descendant. I am wondering why these subhalos have no merger tree and how to add some criteria to avoid them. Would a limit on mass help?

Thank you,
Yun-Hsin

Dylan Nelson
  • 19 Jul

Hello,

Yes it's true, I imagine most of these are very small objects near the limit of 20 particles (per subhalo).

If you enforce a limit of 1000 particles per subhalo most objects should have merger trees.

On other hand, if you just want to avoid these cases, you can check if they have a tree, and if not, skip it.

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