Skip to main content

HEASARC's web sites were down from Saturday Oct 24 - Weds Oct 28 due to addressing the PHP security vulnerability issue.

Xspec Home Page

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


posm: positronium continuum

Positronium continuum (Brown & Leventhal 1987)

\begin{multline*} A(E) = K{2\over{(\pi^2-9)E_c}} \Bigg[{E(E_c-E)\over{(2E_c-E)^2... ...og\!\left({{E_c-E}\over{E_c}}\right) + {(2E_c-E)\over{E}}\Bigg] \end{multline*}

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

norm $K$, normalization