Which detection method looks for the spectral signature of hot intracluster gas emissions?
Answer
X-ray band emission
One of the most effective and direct methods for identifying galaxy clusters involves targeting the spectral signature produced by the intracluster medium. This medium consists of plasma heated to extreme temperatures, causing it to emit intensely across the X-ray portion of the electromagnetic spectrum. Detecting this specific X-ray signature allows scientists to confirm the presence of a massive, hot, gravitationally bound structure, providing essential data for density mapping and subsequent extrapolation across the observable universe volume.
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How Many Galaxy Clusters Are There? - Physics Frontier - YouTube
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