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Intensity mapping has attracted significant interest as an approach tomeasure the properties of the interstellar medium in typical galaxies at highredshift. Intensity mapping measures the statistics of surface brightness as afunction of frequency, making it sensitive not only to all line emission ofinterest but also radiation from all other sources. Significant effort has goneinto developing approaches that reject foreground contamination. Additionally,the target galaxies have multiple sources of emission that can complicate theinterpretation of the line brightness. We describe the problem of jointlyestimating correlated continuum emission and cleaning uncorrelated continuumemission, such as from the Milky Way. We apply these considerations to across-correlation of Planck data with BOSS quasars for a determination of CIIfor 2 < z < 3.2. Intensity mapping surveys with few bands have uniquechallenges for treating foregrounds and avoiding bias from correlated continuumemission. We show how a future intensity mapping survey with many bands canseparate line from continuum emission in cross-correlation.

Intensity Mapping in the Presence of Foregrounds and Correlated Continuum Emission