The mass of the low resolution particle in TNG-Cluster
Qin PENG
24 Apr
Hi Dylan,
Could you please tell me the mass of the low resolution particle in TNG-Cluster? I have asked the MassTable[2] of the header of hdf5 file, but return 0. I want to know the zoom-in factor of this simulation.
Thank you.
Dylan Nelson
25 Apr
There is not a single low-resolution (DM) particle mass.
There is a single high-resolution (DM) particle mass, this you find in MassTable[1].
However, the low-resolution particles form "shells" that progressively coarsen (become higher mass) as you move away from the target zoom region.
So if you load PartType2/Masses and plot a histogram, you will see a series of peaks, each peak corresponds to a shell. The very last peak at the largest mass corresponds to the lowest-resolution "background grid".
Qin PENG
25 Apr
So what is the approximate zoom-in factor relative to the original simulation? In other word, what is the mass of the DM particle of the original simulation?
Saarthak Johri
This comment was deleted.
Dylan Nelson
23h
TNG-Cluster achieves an effective 8192^3 resolution in its box, while the parent dark matter simulation that the halos were selected from was 2048^3. So this is a mass factor of 64. However, this factor is not relevant, since the parent box could have also been run at 1024^3 or 4096^3 and the end result would have been the same.
Hi Dylan,
Could you please tell me the mass of the low resolution particle in TNG-Cluster? I have asked the MassTable[2] of the header of hdf5 file, but return 0. I want to know the zoom-in factor of this simulation.
Thank you.
There is not a single low-resolution (DM) particle mass.
There is a single high-resolution (DM) particle mass, this you find in
MassTable[1].However, the low-resolution particles form "shells" that progressively coarsen (become higher mass) as you move away from the target zoom region.
So if you load
PartType2/Massesand plot a histogram, you will see a series of peaks, each peak corresponds to a shell. The very last peak at the largest mass corresponds to the lowest-resolution "background grid".So what is the approximate zoom-in factor relative to the original simulation? In other word, what is the mass of the DM particle of the original simulation?
TNG-Cluster achieves an effective 8192^3 resolution in its box, while the parent dark matter simulation that the halos were selected from was 2048^3. So this is a mass factor of 64. However, this factor is not relevant, since the parent box could have also been run at 1024^3 or 4096^3 and the end result would have been the same.
Thank you.