Constant spectral model

This model takes a constant value along the spectral range.

\[\phi(E) = k\]

Example plot

Here is an example plot of the model:

from astropy import units as u
import matplotlib.pyplot as plt
from gammapy.modeling.models import ConstantSpectralModel, Models, SkyModel

energy_bounds = [0.1, 100] * u.TeV
model = ConstantSpectralModel(const="1 / (cm2 s TeV)")
model.plot(energy_bounds)
plt.grid(which="both")

YAML representation

Here is an example YAML file using the model:

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

print(models.to_yaml())

components:
-   name: constant-model
    type: SkyModel
    spectral:
        type: ConstantSpectralModel
        parameters:
        -   name: const
            value: 1.0
            unit: cm-2 s-1 TeV-1
metadata:
    creator: Gammapy 2.0.dev155+g9309a089d
    date: '2024-12-18T16:14:20.387606'
    origin: null