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We report the detection of correlated anisotropies in the Cosmic Far-InfraredBackground at 160 microns. We measure the power spectrum in the Spitzer/SWIRELockman Hole field. It reveals unambiguously a strong excess above cirrus andPoisson contributions, at spatial scales between 5 and 30 arcminutes,interpreted as the signature of infrared galaxy clustering. Using our model ofinfrared galaxy evolution we derive a linear bias b=1.74 \pm 0.16. It is afactor 2 higher than the bias measured for the local IRAS galaxies. Our modelindicates that galaxies dominating the 160 microns correlated anisotropies areat z~1. This implies that infrared galaxies at high redshifts are biasedtracers of mass, unlike in the local Universe.

Correlated Anisotropies in the Cosmic Far-Infrared Background Detected by MIPS/Spitzer: Constraint on the Bias