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New multi-band observations of the famous compact group of galaxies Stephan'sQuintet (SQ) are presented and analyzed. These include far infrared (FIR)images at 60$\mu m$ and 100$\mu m$ (ISOPHOT C-100 camera), radio continuumimages at 1.4 GHz (VLA B-array) and 4.86 GHz (VLA C-array), and long-slitoptical spectrographs (Palomar $200"$ telescope). With these new data, we aimto learn more about the X-ray/radio ridge in the middle of the intragroupmedium (IGM) and the IGM starburst SQ-A, both are likely to be caused by thehigh speed collision ($\sim 900$ km s$^{-1}$) between the intruder galaxy NGC7318b ($v = 5700$ km s$^{-1}$) and the IGM ($v = 6600$ km s$^{-1}$).

Physical Conditions and Star Formation Activity in the Intragroup Medium of Stephan’s Quintet