SkyModel

class gammapy.modeling.models.SkyModel(spectral_model, spatial_model=None, name='source')

Bases: gammapy.modeling.models.SkyModelBase

Sky model component.

This model represents a factorised sky model. It has Parameters combining the spatial and spectral parameters.

TODO: add possibility to have a temporal model component also.

Parameters

spectral_modelSpectralModel

Spectral model

spatial_modelSpatialModel

Spatial model (must be normalised to integrate to 1)

namestr

Model identifier

Attributes Summary

default_parameters
evaluation_radius	Angle
frame
parameters	Parameters (Parameters)
position	SkyCoord
spatial_model	SpatialModel
spectral_model	SpectralModel
tag

Methods Summary

__call__(self, lon, lat, energy)	Call self as a function.
copy(self, \*\*kwargs)	Copy SkyModel
create(tag, \*args, \*\*kwargs)	Create a model instance.
evaluate(self, lon, lat, energy)	Evaluate the model at given points.
evaluate_geom(self, geom)	Evaluate model on Geom.
from_dict(data)	Create SkyModel from dict
to_dict(self)	Create dict for YAML serilisation

Attributes Documentation

default_parameters = <gammapy.modeling.parameter.Parameters object>

evaluation_radius

Angle

frame

parameters

Parameters (Parameters)

position

SkyCoord

spatial_model

SpatialModel

spectral_model

SpectralModel

tag = 'SkyModel'

Methods Documentation

__call__(self, lon, lat, energy)

Call self as a function.

copy(self, **kwargs)

Copy SkyModel

static create(tag, *args, **kwargs)

Create a model instance.

Examples

>>> from gammapy.modeling import Model
>>> spectral_model = Model.create("PowerLaw2SpectralModel", amplitude="1e-10 cm-2 s-1", index=3)
>>> type(spectral_model)
gammapy.modeling.models.spectral.PowerLaw2SpectralModel

evaluate(self, lon, lat, energy)

Evaluate the model at given points.

The model evaluation follows numpy broadcasting rules.

Return differential surface brightness cube. At the moment in units: cm-2 s-1 TeV-1 deg-2

Parameters

lon, latQuantity

Spatial coordinates

energyQuantity

Energy coordinate

Returns

valueQuantity

Model value at the given point.

evaluate_geom(self, geom)

Evaluate model on Geom.

classmethod from_dict(data)

Create SkyModel from dict

to_dict(self)

Create dict for YAML serilisation