Summary of Foreground Sources
Sunyaev-Zeldovich Effect
Thermal SZE -creates slightly shifted blackbody spectrum.
Kinetic SZE - creates blackbody spectrum at slightly different temperature.
Extragalactic Radio Sources
Active Galactic Nuclei, QSOs, etc.
Far-Infrared Sources
IR sources contribute considerable microwave radiation
Various and Sundry Galactic Sources
Free-free radiation, galactic dust, synchrotron radiation