astropy
metadata fail the tests
I have a rockstar catalog and when I try to retrieve the values of viral radius using columns_to_keep_dict, I get this:
The halo catalog and/or its associated metadata fail the following tests:
- All values of the
halo_rvircolumn must be less than 50, crudely ensuring you used Mpc/h units.
Can anyone help here?
The problem is most likely that your halo_rvir column data is stored in kpc, rather than Mpc, so the data in this column need to have their units converted because Halotools assumes all distances in a halo catalog will be in the same units. This is a very common issue when processing Rockstar hlist files, and so there is a mechanism dedicated to resolving this difference in convention. Have a look at the docstring to the RockstarHlistReader.read_halocat method. The first argument is columns_to_convert_from_kpc_to_mpc, a list of strings. For any column you wish to read in and convert from kpc to Mpc, the name of the column should appear in this list.
Okay, I got it now. Thanks!
On Thu, Mar 28, 2019 at 3:17 AM Andrew Hearin [email protected] wrote:
The problem is most likely that your halo_rvir column data is stored in kpc, rather than Mpc, so the data in this column need to have their units converted because Halotools assumes all distances in a halo catalog will be in the same units. This is a very common issue when processing Rockstar hlist files, and so there is a mechanism dedicated to resolving this difference in convention. Have a look at the docstring to the RockstarHlistReader.read_halocat method. The first argument is columns_to_convert_from_kpc_to_mpc, a list of strings. For any column you wish to read in and convert from kpc to Mpc, the name of the column should appear in this list.
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