bbody, zbbody: blackbody

A blackbody spectrum.

$\displaystyle A(E) = {{K \times 8.0525 E^2 dE}\over{(kT)^4[\exp(E/kT)-1]}}$

where

par1= kT	temperature keV
norm= K	$L_{39}/D_{10}^2$ , where $L_{39}$ is the source luminosity in units of $10^{39}$ erg/s and $D_{10}$ is the distance to the source in units of 10 kpc.

The zbbody variant allows an additional redshift parameter

$\displaystyle A(E) = {{K \times 8.0525 [E(1+z)]^2 dE}\over{(1+z)(kT)^4[\exp[E(1+z)/kT]-1]}}$

where

par1= kT	temperature keV
z	redshift
norm= K	$L_{39}/[D_{10}(1+z)]^2$ , where $L_{39}$ is the source luminosity in units of $10^{39}$ erg/s and $D_{10}$ is the distance to the source in units of 10 kpc.