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We present SOFIA observations with HAWC+ and FIFI-LS of the peculiar galaxyArp 25, also known as NGC 2276 or UGC 3740, whose morphology is deformed by itsimpact with the intra-group medium of the NGC 2300 galaxy group. Theseobservations show the first direct proof of the enhancement of [CII] emissiondue to shocks caused by ram pressure in a group of galaxies. By comparing the[CII] emission to UV attenuation, dust emission, PAH, and CO emission indifferent regions of the galaxy, we find a clear excess of [CII] emission alongthe impact front with the intra-group medium. We estimate that the shock due tothe impact with the intra-group medium increases the [CII] emission along theshock front by 60% and the global [CII] emission by approximately 25% withrespect to the predicted [CII] emission assuming only excitation caused bystellar radiation. This result shows the danger of interpreting [CII] emissionas directly related to star formation since shocks and other mechanisms cansignificantly contribute to the total [CII] emission from galaxies in groupsand clusters.

Shock enhanced [CII] emission from the infalling galaxy Arp 25