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The Cygnus Loop has been the focus of substantial debate concerning thecontribution of charge exchange (CX) to supernova remnant (SNR) X-ray emission.We take advantage of a distinct feature of CX, enhanced K{\alpha} forbiddenline emission, and employ the energy centroid of the OVII K{\alpha} triplet asa diagnostic. Based on X-ray spectra extracted from an extensive set of Suzakuobservations, we measure the energy centroid shifts of the triplet on and offthe shock rim of the remnant. We find that enhanced forbidden to resonance lineemission exists throughout much of the rim and this enhancement azimuthallycorrelates with non-radiative H{\alpha} filaments, a tracer of strongneutral-plasma interaction in the optical. We also show that alternativemechanisms cannot explain the enhancement observed. These results demonstratethe need to model the CX contribution to the X-ray emission of SNRs,particularly for shocks propagating in a partially neutral medium. Suchmodeling may be critically important to the correct measurements of theionization, thermal, and chemical properties of SNRs.

X-ray Emission from Charge Exchange in the Cygnus Loop SNR