# 4.1.3. Bb: blackbody model¶

The surface energy flux of a blackbody emitter is given by

(Chapter 1 of Rybicki & Lightman 1986). We transform this into a spectrum with energy units (conversion from Hz to keV) and obtain for the total photon flux:

where now is the photon energy in keV, the temperature in keV and is the elementary charge in Coulomb. Inserting numerical values and multiplying by the emitting area , we get

where N(E) is the photon spectrum in units of  photons/s/keV and the emitting area in  .

The parameters of the model are:

norm : Normalisation (the emitting area, in units of  . Default value: 1.
t : The temperature in keV. Default value: 1 keV.

Recommended citation: Kirchhoff (1860).