Planck Early Results: The Power Spectrum Of Cosmic Infrared Background Anisotropies

Using Planck maps of six regions of low Galactic dust emission with a total area of about 140 deg 2 , we determine the angular power spectra of Cosmic Infrared Background (CIB) anisotropies from multipole`= 200 to`= 2000 at 217, 353, 545 and 857 GHz. We use observations of Hi emission as a tracer of thermal dust emission in order to reduce the already low level of Galactic dust emission and use the 143 GHz Planck maps in these fields to clean out cosmic microwave background anis otropies. Both of these cleaning processes are necessary in order to avoid significant contamination of the CIB signal. We measure correlated CIB structure across frequencies. As expected, the correlation decreases with increasing frequency separation as the contribution of high-redshift galaxies to CIB anisotropies increases with wavelengths. We find no significant di fference ` (� )