Actually yes. You could check this yourself by examining the last column in HopAnalysis out. If max_r < 2*(1/512)=3.9e-3 then yes, it will skip it. In one of my simulations, a 5e11 Msun halo has a max_r of 2.64e-03 corresponding to 168 kpc/h. The halo profiler was not built for profiling halos with < 2 cells in radius. In my mind you have at least four options:
Here is how I am using it right now...
And i get 500.
Do you think it has something to do with the grid spacing (for 512 ^3 grid in 200 Box, it is 390 Kpc)
HaloProfiler may be skipping small halos completely since they are smaller than 390 Kpc.
From: email@example.com on behalf of Sam Skillman
Sent: Sun 2/28/2010 12:34 PM
To: Discussion of the yt analysis package
Subject: Re: [yt-users] Dealing with HOP groups
Do you have a line that looks like:
If so, please post it. The number of halos > 10^14 Msun is fairly close to
500 in a 200 Mpc box. If you want the halo profiler to use all halos, set
On Sun, Feb 28, 2010 at 11:08 AM, Agarwal, Shankar <firstname.lastname@example.org> wrote:
> Hi Stephen,
> I read
> Do you remember the cosmology parameters for your run: particles, grid,
> box, refinement, AMR ON or OFF ?
> I have run a 200 Mpc/h box, 512^3 particle, 512^3 grid, AMR-OFF simulation
> and I get about 30,000 halos using HOP. When I try to finding virial halos,
> I get only 500. I may have to increase the grid to 1024^3.
> Let me know how you got 40,000 virial halos.
> yt-users mailing list
Samuel W. Skillman
DOE Computational Science Graduate Fellow
Center for Astrophysics and Space Astronomy
University of Colorado at Boulder
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