rail.interactive.creation.engines.dsps_sed_modeler module

rail.interactive.creation.engines.dsps_sed_modeler.dsps_population_sed_modeler(**kwargs)

Derived class of Modeler for creating a population of galaxy rest-frame SED models using DSPS v3. (Hearin+21). SPS calculations are based on a set of template SEDs of simple stellar populations (SSPs). Supplying such templates is outside the planned scope of the DSPS package, and so they will need to be retrieved from some other library. For example, the FSPS library supplies such templates in a convenient form.

The input galaxy properties, such as star-formation histories and metallicities, need to be supplied via an hdf5 table.

The user-provided metallicity grid should be consistently defined with the metallicity of the templates SEDs. Users should be cautious in the use of the cosmic time grid. The time resolution strongly depends on the user scientific aim. jax serially execute the computations on CPU on single core, for CPU parallelization you need MPI. If GPU is used, jax natively and automatically parallelize the execution.

—

This function generates the rest-frame SEDs and stores them into the Hdf5Handle.

—

This function was generated from the function rail.creation.engines.dsps_sed_modeler.DSPSPopulationSedModeler.fit_model

Parameters:

input_data (str, required) – Filepath to the hdf5 table containing galaxy properties.
Om0 (float, optional) – Omega matter: density of non-relativistic matter in units of the critical density at z=0.
w0 (float, optional) – Dark energy equation of state at z=0 (a=1). This is pressure/density for dark energy in units where c=1.
wa (float, optional) – Negative derivative of the dark energy equation of state with respect to the scale factor. A cosmological constant has w0=-1.0 and wa=0.0.
h (float, optional) – dimensionless Hubble constant at z=0.
ssp_templates_file (str, optional) – hdf5 file storing the SSP libraries used to create SEDs Default: rail/examples_data/creation_data/data/dsps_default_data/ssp_data_fsps_v 3.2_lgmet_age.h5
redshift_key (str, optional) – The keyword of the redshift group in the hdf5 dataset. Default: redshifts
cosmic_time_grid_key (str, optional) – Cosmic time grid keyword name of the hdf5 dataset, this is the grid of Universe age over which the stellar mass build-up takes place in units of Gyr Default: cosmic_time_grid
star_formation_history_key (str, optional) – Star-formation history keyword name of the hdf5 dataset, this is the star- formation history of the galaxy in units of Msun/yr Default: star_formation_history
stellar_metallicity_key (str, optional) – Stellar metallicity keyword name of the hdf5 dataset, this is the stellar metallicity in units of log10(Z) Default: stellar_metallicity
stellar_metallicity_scatter_key (str, optional) – Stellar metallicity scatter keyword name of the hdf5 dataset, this is lognormal scatter in the metallicity distribution function Default: stellar_metallicity_scatter
restframe_sed_key (str, optional) – Rest-frame SED keyword name of the output hdf5 dataset Default: restframe_seds
default_cosmology (bool, optional) – True to use default DSPS cosmology. If False,Om0, w0, wa, h need to be supplied in the fit_model function Default: True
min_wavelength (float, optional) – The minimum rest-frame wavelength. Default: 250
max_wavelength (float, optional) – The maximum rest-frame wavelength Default: 12000

Returns:

Hdf5 table storing the rest-frame SED model

Return type:

dict

rail.interactive.creation.engines.dsps_sed_modeler.dsps_single_sed_modeler(**kwargs)

Derived class of Modeler for creating a single galaxy rest-frame SED model using DSPS v3. (Hearin+21). SPS calculations are based on a set of template SEDs of simple stellar populations (SSPs). Supplying such templates is outside the planned scope of the DSPS package, and so they will need to be retrieved from some other library. For example, the FSPS library supplies such templates in a convenient form.