[yt-users] Halo Merger Trees

[Britton Smith]

Hi Carla,

I think your best option right now is to use the Rockstar halo finder along
with the consistent-trees code.  For the halo finding, you will need to run
rockstar on a time-series as rockstar will do the descendent/ancestor
linking at the same time.  Here is a script to help you do that:
http://paste.yt-project.org/show/6810/

You can get the consistent trees code here:
https://bitbucket.org/pbehroozi/consistent-trees
The instructions there will tell you how to use it.

Consistent-trees will generate a large ascii file with the merger tree
information.  Reading that in can be a pain, but I have been working on a
code that can read these files and create a data structure that is pretty
easy to work with.  I am still polishing it up and adding documentation,
but this portion of it is complete.  I would prefer to wait until it is
totally done to release it to the world, but I will gladly share it with
you with a couple sample scripts to get you going.  If you're interested,
please contact me off-list and I would be glad to set you up.

Britton

On Fri, Sep 9, 2016 at 3:46 PM, Carla Bernhardt <carla.j.bernhardt at gmail.com
> wrote:

> Dear YT group,
>
> I need to create halo merger trees from enzo outputs, but found that this
> functionality was removed starting at yt 3.0
> <http://yt-project.org/doc/analyzing/analysis_modules/halo_merger_tree.html>.
> I tried using yt version 2.6.1 (not my ideal solution), but using a
> simple script <http://pastebin.com/EZRfb5kG>, I still got an I/O error
> <http://pastebin.com/kYmLGepN> in writing a database for halos.
>
> I expect this functionality will be added soon as it is very needed, but
> in the mean time, how can I produce halo merger trees from enzo output with
> yt 3.3.1?
>
> Best,
> Carla Bernhardt
> PhD Student
> Universität Heidelberg
> ZAH Institut für Theoretische Astrophyik
>
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