NumCosmoHaloCatalogGenerator

Samples a NcHaloCatalog from a cluster abundance model.

A reusable object that draws a Poisson realization of the cluster number counts from a NcClusterAbundance and, for each drawn object, samples the observed redshift and mass through the NcClusterRedshift and NcClusterMass models found in the NcmMSet. The result is returned as a NcHaloCatalog of kind NC_HALO_CATALOG_KIND_CLUSTER.

It assembles the existing sampling machinery rather than reimplementing it, and is meant to be reused by the likelihood data objects (for example NcDataClusterNCount) and by higher-level mock generators. Richer mocks (sky positions, member galaxies) are expected to be built by composition, holding extra collaborators that augment the generated catalog.

The generated catalog columns are, in order:

• z_true, lnM_true: the true redshift and mass;
• z_obs_0 .. z_obs_{n-1}: the observed redshift block (n = redshift observable length);
• lnM_obs_0 .. lnM_obs_{m-1}: the observed mass block;
• z_obs_param_0 .. and lnM_obs_param_0 .. : the observable parameter blocks, when the models declare any;
• ra, dec: sky position (degrees), only when a NcmSkyFootprint is set (see nc_halo_catalog_generator_set_footprint());
• r_Delta: the spherical-overdensity radius (Mpc) of the true halo, only when radius output is enabled (see nc_halo_catalog_generator_set_with_radius()). It is computed from $M_\Delta = \frac{4\pi}{3}\,\Delta\,\rho_\mathrm{bg}\, r_\Delta^3$ using the mass definition ($\Delta$ and background density) carried by the multiplicity function used to draw the counts.