  In a previous paper the spectrum of positrons produced by matter initially at
rest falling onto a massive compact object was calculated. In this paper this
calculation is generalized to obtain both the spectrum of in-flight positron
annihilation and pi0 decay gamma rays produced when protons with a cosmic
ray-like spectrum hit the surface. The resulting pi0 decay gamma ray spectrum
reflects the high energy proton energy spectrum, and is largely independent of
the mass of the compact object. One notable prediction for all compact objects
is a dip in the spectrum below 70 MeV. As applied to the 10^6 solar mass
massive compact object near to the center of our galaxy, our theory shows
promise for explaining the gamma rays coming from the galactic center as
observed by both the Compton satellite and HESS ground based array.
