Folks, I am confused about how to compute merger trees with yt. Documentation (https://yt-project.org/doc/analyzing/analysis_modules/halo_merger_tree.html?...) refers to ytree package, but that package documentation seems to indicate that only FoF or Subfind halo catalogs can be converted into a merger tree, while the halo finder in yt is HOP. I have run HOP for several snapshots from a simulation. What would you recommend to use to make a merger tree from such a data set? Thank you, Nick Gnedin
HI Nick,
Sadly, yt's FoF and HOP finders don't output member particle information
for the halos, so it might not be possible to use those catalogs to make
merger trees. ytree's merger-tree creation works with FoF catalogs
generated by the inline Gadget halo finder, for which yt supports
extracting member particle information. If you're looking to make
merger-trees, the best route currently is probably
Rockstar/consistent-trees, the outputs of which can be loaded by ytree.
It is probably a week's worth of work to fix up yt's HOP/FoF finders to
output particle information and then to add support for loading that into
yt.
Britton
On Fri, Oct 5, 2018 at 6:07 AM Nick Gnedin
Folks,
I am confused about how to compute merger trees with yt. Documentation ( https://yt-project.org/doc/analyzing/analysis_modules/halo_merger_tree.html?...)
refers to ytree package, but that package documentation seems to indicate that only FoF or Subfind halo catalogs can be converted into a merger tree, while the halo finder in yt is HOP.
I have run HOP for several snapshots from a simulation. What would you recommend to use to make a merger tree from such a data set?
Thank you,
Nick Gnedin
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participants (2)
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Britton Smith
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Nick Gnedin