In cosmology, intensity mapping is an observational technique for surveying the large-scale structure of the universe by using the integrated radio emission from unresolved gas clouds. In its most common variant, 21 cm intensity mapping, the 21 cm emission line of neutral hydrogen is used to trace the gas.
In cosmology, intensity mapping is an observational technique for surveying the large-scale structure of the universe by using the integrated radio emission from unresolved gas clouds. In its most common variant, 21 cm intensity mapping, the 21 cm emission line of neutral hydrogen is used to trace the gas.
Source: Wikipedia "Intensity mapping" · CC BY-SA 4.0
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