We report on new 1.41 GHz Green Bank Telescope and 352 MHz Westerbork Synthesis Radio Telescope observations of the Coma cluster and its environs .
At 1.41 GHz we tentatively detect an extension to the Coma cluster radio relic source 1253+275 which makes its total extent \sim 2 Mpc .
This extended relic is linearly polarized as seen in our GBT data , the NVSS , and archival images , strengthening a shock interpretation .
The extended relic borders a previously undetected “ wall ” of galaxies in the infall region of the Coma cluster .
We suggest that the radio relic is an infall shock , as opposed to the outgoing merger shocks believed responsible for other radio relics .
We also find a sharp edge , or “ front ” , on the western side of the 352 MHz radio halo .
This front is coincident with a similar discontinuity in the X-ray surface brightness and temperature in its southern half , suggesting a primary shock-acceleration origin for the local synchrotron emitting electrons .
The northern half of the synchrotron front is less well correlated with the X-ray properties , perhaps due to projection effects .
We confirm the global pixel-to-pixel power-law correlation between the 352 MHz radio brightness and X-ray brightness with a slope that is inconsistent with predictions of either primary shock acceleration or secondary production of relativistic electrons in Giant Radio Halos , but is allowable in the framework of the turbulent re-acceleration of relic plasma .
The failure of these first order models and the need for a more comprehensive view of the intracluster medium energization is also highlighted by the very different shapes of the diffuse radio and X-ray emission .
We note the puzzling correspondence between the shape of the brighter regions of the radio halo and the surface mass density derived from weak lensing .