next up previous contents
Next: powerlaw, zpowerlw: power law Up: Additive Model Components Previous: plcabs: powerlaw observed through


posm: positronium continuum

Positronium continuum (Brown & Leventhal 1987 ApJ 319, 637)


\begin{displaymath}
A(E) = K{2\over{(\pi^2-9)E_c}} [{E(E_c-E)\over{(2E_c-E)^2}} ...
...er{(2E_c-E)^3}}\log({{E_c-E}\over{E_c}}) + {(2E_c-E)\over{E}}]
\end{displaymath}

for $E < E_c$ = 511 keV, where:

norm $K$, normalization