Planck All-Sky Surveys and the Sources They Will Reveal

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In addition to providing high-resolution, whole-sky images of the cosmic microwave background, Planck will provide sensitive all-sky surveys of galactic and extragalactic sources at a range of mm and sub-mm wavelengths. Planck will measure polarizations of these sources in most of its frequency bands, and can measure variability on a range of time scales from minutes to months. We expect Planck to detect more than 104 extragalactic sources (vs. ≈200 in the WMAP catalog), most of them dusty galaxies. Planck will thus provide a unique data-base for studies of sources ranging from blazars to the youngest radio sources, and from IRAS galaxies with cold dust to high-redshift, lensed, dusty galaxies. Two catalogs will be prepared: an Early Release Compact Source Catalog (enabling rapid follow-up with Herschel and other observatories) and a later complete catalog of compact sources. In this talk, I will emphasize the science to be gained from Planck measurements of extragalactic sources. I will also describe ground-based and other programs designed to increase our understanding of extragalactic sources before launch and to follow up interesting sources found during the mission.

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