[yt-users] halo finding on a volume subset

[Irina Dvorkin]

Hi Stephen,

Basically I want to save time.
I'm working with the SCA, where each simulation is 256 Mpc/h on a  
side, but the AMR was done only in the central region, where the  
cluster is supposed to form (a few tens of Mpc). So I'm interested  
only in the region with the good resolution. Also, the halos I want to  
find are not on the boundary of this region, since that would mean  
they have mediocre resolution.

Maybe you could give me some hints and I will try and think about it  
myself, at least for my particular problem.

Thanks a lot,
Irina


Quoting "Stephen Skory" <stephenskory at yahoo.com>:

> Irina,
>
>
>
>> Is there a way to run the halo finder on part of the  simulation volume?
>> For example, I have a box 256 Mpc on a side but I only  want to find halos
>> inside a smaller box, say 20 Mpc on a side.
>
>
> Unfortunately, this is not currently possible in yt. However, it should be
> possible if the right modifications are done. Something along these  
> lines is how
> HOP/FOF are parallelized, so it should be translateable to your problem. I am
> not making promises that I will do this, but that it is possible. I'll think
> about it.
>
> However, I wonder why you only want halos in a small region? Do you have a
> nested simulation? Does it seem like the halo finding is taking too long? Are
> you looking for substructure? Depending on the answers to these  
> questions, the
> modifications discussed above may not be required.
>
>  _______________________________________________________
> sskory at physics.ucsd.edu o__ Stephen Skory
> http://physics.ucsd.edu/~sskory/ _.>/ _Graduate Student
> ________________________________(_)_\(_)_______________
>
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