Class
NumCosmoGalaxyShapePopGauss
Description [src]
final class NumCosmo.GalaxyShapePopGauss : NumCosmo.GalaxyShapePop
{
/* No available fields */
}Truncated-Gaussian intrinsic ellipticity distribution.
The intrinsic ellipticity follows an isotropic Gaussian of width $\sigma$
truncated to the unit disk: the 2D area density is
$P_\mathrm{2D}(\chi_I) \propto \exp(-r^2/2\sigma^2)$, $r=|\chi_I|$. The
public r-marginal contract (see NcGalaxyShapePop‘s own docs)
is $P_\mathrm{pop}(r) = 2\pi r\,P_\mathrm{2D}(r) \propto r\exp(-r^2/2\sigma^2)$
on $[0,1)$ — multiplying the natural area-density form by $r$, always
safe (never a pole), unlike populations whose natural form is the
r-marginal itself (see NcGalaxyShapePopBeta).
Functions
nc_galaxy_shape_pop_gauss_clear
Decreases the reference count of gspg by one, and sets the pointer gspg to
NULL.
Instance methods
Methods inherited from NcGalaxyShapePop (11)
nc_galaxy_shape_pop_e_rms
Computes the per-component intrinsic RMS ellipticity
$e_\mathrm{rms} = \sqrt{\langle |\chi_I|^2 \rangle / 2}$ implied by data.
nc_galaxy_shape_pop_eval_p
Evaluates the population’s own natural r-marginal density
$P_\mathrm{pop}(r)$, normalized so $\int_0^1 P_\mathrm{pop}(r)\,\mathrm{d}r=1$,
reading the resolved parameters from data (no live parameter access).
This is NOT a 2D area density — a consumer needing the density with
respect to $\mathrm{d}^2\chi_I$ computes $P_\mathrm{pop}(r)/(2\pi r)$
itself (see the class docs for why that division, not this vfunc, is
where any $r=0$ divergence for a population like NcGalaxyShapePopBeta
with $\alpha<2$ actually lives).
nc_galaxy_shape_pop_eval_p_array
Batched form of nc_galaxy_shape_pop_eval_p(): evaluates the population
density at every element of r in one call.
nc_galaxy_shape_pop_eval_p_rho2_g_series
Taylor-in-$g$ analog of nc_galaxy_shape_pop_eval_p(): composes this
population’s own fully normalized density with the (already computed,
population-independent) shear-map series $x(g)$, order by order in $g$.
There is no generic default — every subclass used with
NcGalaxyShapeFactorSeriesLensed must provide its own implementation; the
base class errors clearly otherwise.
nc_galaxy_shape_pop_exponent_at_origin
Determines how the population density behaves at the origin.
nc_galaxy_shape_pop_free
Decreases the reference count of gsp by one.
nc_galaxy_shape_pop_gen
Samples an intrinsic ellipticity $\chi_I = e_1 + i e_2$ from data.
nc_galaxy_shape_pop_get_mode_r
Gets the mode of $r=|\chi_I|$ for this galaxy’s resolved population
density, i.e. where $P_\mathrm{pop}(r)$ peaks. This is a per-data
capability (data->ldata_get_mode_r), not a virtual method, mirroring
nc_galaxy_shape_pop_get_sigma(); unlike that capability, 0 is always a
meaningful default (the model is assumed radially symmetric about
$\chi_I=0$ unless it says otherwise), so this never errors.
nc_galaxy_shape_pop_get_sigma
Gets the (untruncated) Gaussian width sigma resolved for this galaxy, for
models that parameterize their density this way (the Gauss family, Global
or per-galaxy). This is a per-data capability (data->ldata_get_sigma),
not a virtual method: any concrete model sharing the same internal
representation can populate it, regardless of its position in the class hierarchy.
nc_galaxy_shape_pop_prepare
Resolves the model parameters (and the per-galaxy data->e_rms, for per-galaxy
models) into data: the subclass-specific parameters stored in data->ldata
that nc_galaxy_shape_pop_eval_p() reads.
nc_galaxy_shape_pop_ref
Increases the reference count of gsp by one.
Properties
NumCosmo.GalaxyShapePopGauss:sigma
The width $\sigma$ of the truncated Gaussian intrinsic ellipticity.
Properties inherited from NcmModel (9)
NumCosmoMath.Model:implementation
The implementation flags of the model class, see ncm_model_check_impl_flag().
NumCosmoMath.Model:name
The name of the model class.
NumCosmoMath.Model:nick
The nickname of the model class.
NumCosmoMath.Model:params-types
The NcmParamType of each parameter.
NumCosmoMath.Model:reparam
The reparametrization, see ncm_model_set_reparam().
NumCosmoMath.Model:scalar-params-len
The number of scalar parameters.
NumCosmoMath.Model:sparam-array
The parameter descriptions that differ from the class ones, NcmSParam keyed by
parameter index. Each one is placed by its parameter name: a description of a
parameter declared with ncm_model_class_add_removed_param() is skipped, and one of
any other unknown parameter aborts.
NumCosmoMath.Model:submodel-array
The submodels, attached at construction.
NumCosmoMath.Model:vector-params-len
The number of vector parameters (not their lengths).
Signals
Signals inherited from GObject (1)
GObject::notify
The notify signal is emitted on an object when one of its properties has its value set through g_object_set_property(), g_object_set(), et al.