SkyModels¶

class gammapy.cube.models.SkyModels(skymodels)[source]¶

Bases: gammapy.utils.fitting.Model

Collection of SkyModel

Parameters:

skymodels : list of SkyModel

Sky models

Examples

Read from an XML file:

from gammapy.cube import SkyModels
filename = '$GAMMAPY_EXTRA/test_datasets/models/fermi_model.xml'
sourcelib = SkyModels.read(filename)

Attributes Summary

parameters Concatenated parameters.

Methods Summary

`copy`()	A deep copy.
`evaluate`(lon, lat, energy)
`from_xml`(xml)	Read from XML string.
`read`(filename)	Read from XML file.
`to_compound_model`()	Return `CompoundSkyModel`
`to_xml`(filename)	Write to XML file.

Attributes Documentation

parameters¶

Concatenated parameters.

Currently no way to distinguish spectral and spatial.

Methods Documentation

copy()¶: A deep copy.

evaluate(lon, lat, energy)[source]¶

classmethod from_xml(xml)[source]¶: Read from XML string.

classmethod read(filename)[source]¶

Read from XML file.

The XML definition of some models is uncompatible with the models currently implemented in gammapy. Therefore the following modifications happen to the XML model definition

PowerLaw: The spectral index is negative in XML but positive in gammapy. Parameter limits are ignored
ExponentialCutoffPowerLaw: The cutoff energy is transferred to lambda = 1 / cutof energy on read

to_compound_model()[source]¶: Return CompoundSkyModel

to_xml(filename)[source]¶: Write to XML file.