Intensity Mapping in the Presence of Foregrounds and Correlated Continuum Emission

Understand

Intensity mapping has attracted significant interest as an approach to measure the properties of the interstellar medium in typical galaxies at high redshift.

• Intensity mapping measures the statistics of surface brightness as a function of frequency, making it sensitive not only to all line emission of interest but also radiation from all other sources.
• Significant effort has gone into developing approaches that reject foreground contamination.
• Additionally, the target galaxies have multiple sources of emission that can complicate the interpretation of the line brightness.