Background are objects representing model backgrounds.
Base class for astronomical photon X-ray background.
Evaluate the background and store it as an attribute.
Notice that the background can be phase-dependent, and that the cached background must be a two-dimensional matrix equal in shape to that of the pulse signal incident on the telescope.
Return the incident background specifc photon flux.
Note that the area units need to be consistent with the units the effective area is expressed in within the response matrix of the instrument object.
Return the registered background count rate signal.
Raised if there is an issue with the incident background .