Question on R200, R500 or Rviral values (in cutouts)
Efrain Gatuzz
15 Oct
Dear Dylan,
I am currently working with TNG300 data at redshift 0. In my project, I compare the simulations with X-ray observations. I have downloaded the .hdf5 halo files. So I can access groups (e.g., PartType0, Dataset = "Masses"). However, I don't see a viral radius or a Group_R_500c value. How can I compute physical parameters (for example, the gas mass or the total mass) at the R200, R500 or viral distances? So I can do a proper comparison with the observations.
Thank you,
Efrain
Dylan Nelson
15h
I suspect you mean that you have downloaded halo cutouts?
These contain only snapshot/particle data.
The types of quantities you are referring to are instead found in the group catalogs. You could download the group catalog for the snapshot you are working with, and look up values such as R200c or R500c for (any) halo.
If you just need the value for a few halos, you can also download halo information from the API (see "info.json" in the API docs).
Dear Dylan,
I am currently working with TNG300 data at redshift 0. In my project, I compare the simulations with X-ray observations. I have downloaded the .hdf5 halo files. So I can access groups (e.g., PartType0, Dataset = "Masses"). However, I don't see a viral radius or a Group_R_500c value. How can I compute physical parameters (for example, the gas mass or the total mass) at the R200, R500 or viral distances? So I can do a proper comparison with the observations.
Thank you,
Efrain
I suspect you mean that you have downloaded halo cutouts?
These contain only snapshot/particle data.
The types of quantities you are referring to are instead found in the group catalogs. You could download the group catalog for the snapshot you are working with, and look up values such as R200c or R500c for (any) halo.
If you just need the value for a few halos, you can also download halo information from the API (see "info.json" in the API docs).