Wu explains that when the CMB and a galactic cluster exist together, some CMB photons are energized by their interaction with intracluster free electrons. This increases the frequency and temperature of these photons, while reducing the number of lower-frequency photons.
吳俊輝解釋，當宇宙背景輻射和星系團同時存在時，背景輻射的光子，會被星系團核心的游離電子加熱，以致光子在高頻訊號將增強、溫度也會較高，但低頻時訊號強度反將減弱，這就是當今宇宙學研究中相當知名的「SZ 效應」。