  We discuss the radio {\it arc} at the galactic center to be the counterpart
of the high-energy \gr source 2EG J1746-2852. The observed \gr flux is constant
within the statistical limits and the spectrum is very hard. The lack of
variability makes it highly unlikely that any of the compact sources in the
vicinity of the Galactic Center is the counterpart of 2EG J1746-2852. This
includes the peculiar source Sgr A$^\ast$ at the very center of the Galaxy,
which is often discussed to harbour a black hole of $10^6\, M_\odot$. Existing
radio data on the {\it arc} support the view that its synchrotron emission
originates from cooling, initially monoenergetic electrons which diffuse and
convect from their sources to the outer extensions of the {\it arc}. If the
source of high-energy electrons coincides with the sickle region (G0.18-0.04),
as indicated by the radio data, then the ambient far- infrared photons can be
up-scattered to \grs by inverse-Compton inter- action with the young
high-energy electrons. We solve the continuity equation for the electrons
including terms for diffusion, convection, monoenergetic injection, and the
full energy loss. We show that both the flux and the spectrum of 2EG J1746-2852
can be well explained.

Astrophysics