bbody

A blackbody spectrum.

A(E) = K*8.0525*E^2*dE/((kT)^4(exp(E/(kT))-1))

where

par1= kT	temperature keV
norm= K	, where is the source luminosity in units of 10³⁹ ergs^-1, D₁₀ is the distance to the source in units of 10 kpc

The zbbody variant allows an additional (fixed) redshift parameter

A(E) = 8.0525K[E(1+z)]^2*dE/((1+z)kT^4*(exp[E(1+z)/kT]-1))

where

par1= kT	temperature keV
z	Fixed redshift
norm= K	, where is the source luminosity in units of 10³⁹ ergs^-1, D₁₀ is the distance to the source in units of 10 kpc