Constant spatial model

This model is a spatially constant model.

Example plot

Here is an example plot of the model:

from gammapy.maps import WcsGeom
from gammapy.modeling.models import (
    ConstantSpatialModel,
    Models,
    PowerLawSpectralModel,
    SkyModel,
)

geom = WcsGeom.create(npix=(100, 100), binsz=0.1)
model = ConstantSpatialModel(value="42 sr-1")
model.plot(geom=geom, add_cbar=True)

YAML representation

Here is an example YAML file using the model:

pwl = PowerLawSpectralModel()
constant = ConstantSpatialModel()

model = SkyModel(spectral_model=pwl, spatial_model=constant, name="pwl-constant-model")
models = Models([model])

print(models.to_yaml())

Out:

components:
-   name: pwl-constant-model
    type: SkyModel
    spectral:
        type: PowerLawSpectralModel
        parameters:
        -   name: index
            value: 2.0
            is_norm: false
        -   name: amplitude
            value: 1.0e-12
            unit: cm-2 s-1 TeV-1
            is_norm: true
        -   name: reference
            value: 1.0
            unit: TeV
            frozen: true
            is_norm: false
    spatial:
        type: ConstantSpatialModel
        parameters: []