SNANA quantities for Roman-Rubin sims

Data are partitioned by (nside=32, ring ordering) healpixel. For each pixel there is a so-called “main file” in parquet format, containing static quantities associated with each source, and an hdf5 file for quantities which vary with time or wavelength or both.

SNANA main file

Name	Datatype	Units	Description
id	int64	N/A	Unique object identifier
ra	double	degrees	Object right ascension
dec	double	degrees	Object declination
host_id	int64	N/A	Host galaxy
gentype	int32	N/A	Type of object simulated
model_name	string	N/A	Type name
start_mjd	float	days	Earliest visibility
end_mjd	float	days	Latest visibility
z_CMB	float	N/A	redshift
mw_EBV	float	N/A	MW extinction parameter
mw_extinction_applied	boolean	N/A	Here always False
AV	float	N/A	For host galaxy, randomly assigned
RV	float	N/A	For host galaxy
v_pec	float	km/sec	Peculiar velocity. Not yet simulated so zero.
host_ra	double	degrees	Host galaxy RA
host_dec	double	degrees	Host galaxy decl.
host_mag_g	float	N/A	Host mag. in Rubin g-band
host_mag_i	float	N/A	Host mag. in Rubin i-band
host_mag_F	float	N/A	Host mag. in Roman F-band
host_sn_sep	float	arcsec	Separation from host
peak_mjd	float	days	Time of peak flux (model-dependent)
peak_mag_g	float	N/A	g-band mag. at peak
peak_mag_i	float	N/A	i-band mag. at peak
peak_mag_F	float	N/A	F-band mag. at peak
lens_dmu_applied	boolean	N/A	False (distance modulus lensing shift not applied)
model_param_names	list(string)	N/A	Model parameter names
model_param_values	list(string)	N/A	Model parameter values
MW_av	float	N/A	MW extinction parameter
MW_rv	float	N/A	MW extinction parameter

SNANA varying quantities

The top-level keys for each file are the ids for sources in that pixel, the same as the ids appearing in the parquet file but here stored as strings. Under each id are the following keys

Name	Datatype	Units	Description
mjd	float array	days	Time axis for flambda
lambda	double array	angstroms	Wavelength axis for flambda
flambda	float 2-d array	erg/sec/A/cm^2	Flux indexed by (mjd,lambda)
mag_<band>	float array	N/A	Magnitude for each mjd computed using 5 angstrom bins.
magcor_<band>	float array	N/A	Correction to magnitude computed using flambda
synmag_<band>	float array	N/A	Magnitude computed from flambda

where <band> takes on values u, g, r, i, z, y (Rubin bandpasses) and F, H, J, K, R, W, Y, Z (for Roman).

mjd values have uniform spacing of 1 day. lambda values have uniform spacing of 100 angstroms.

synmag + magcor = mag