[yt-users] Dealing with HOP groups
Agarwal, Shankar
sagarwal at ku.edu
Sun Feb 28 11:07:00 PST 2010
Hi Sam,
Here is how I am using it right now...
hp.add_halo_filter(HP.VirialFilter,must_be_virialized=True,
overdensity_field='ActualOverdensity',
virial_overdensity=200,
virial_filters=[['TotalMassMsun','>=','5e11']],
virial_quantities=['TotalMassMsun','RadiusMpc'])
hp.make_profiles(filename="VirialHaloes.out")
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.
Shankar
-----Original Message-----
From: yt-users-bounces at lists.spacepope.org 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
Hi Shankar,
Do you have a line that looks like:
hp.add_halo_filter(HP.VirialFilter,must_be_virialized=True,
overdensity_field='ActualOverdensity',
virial_overdensity=200,
virial_filters=[['TotalMassMsun','>=','1e14']],
virial_quantities=['TotalMassMsun','RadiusMpc'])
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
virial_filters=[['TotalMassMsun','>=','1e14']] accordingly.
Sam
On Sun, Feb 28, 2010 at 11:08 AM, Agarwal, Shankar <sagarwal at ku.edu> wrote:
> Hi Stephen,
>
> I read
> http://lists.spacepope.org/pipermail/yt-users-spacepope.org/2009-March/000110.html
>
> 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.
>
> Thanks
> Shankar
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> yt-users at lists.spacepope.org
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>
--
Samuel W. Skillman
DOE Computational Science Graduate Fellow
Center for Astrophysics and Space Astronomy
University of Colorado at Boulder
samuel.skillman[at]colorado.edu
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