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Future observations of CMB anisotropies will be able to probe high multipoleregions of the angular power spectrum, corresponding to a resolution of a fewarcminutes. Dust emission from merging haloes is one of the foregrounds thatwill affect such very small scales. We estimate the contribution to CMB angularfluctuations from objects that are bright in the sub-millimeter band due tointense star formation bursts following merging episodes. We base our approachon the Lacey-Cole merger model and on the Kennicutt relation which connects thestar formation rate in galaxies with their infrared luminosity. We set the freeparameters of the model in order to not exceed the SCUBA source counts, theMadau plot of star formation rate in the universe and COBE/FIRAS data on theintensity of the sub-millimeter cosmic background radiation. We show that theangular power spectrum arising from the distribution of such star-forminghaloes will be one of the most significant foregrounds in the high frequencychannels of future CMB experiments, such as PLANCK, ACT and SPT. Thecorrelation term, due to the clustering of multiple haloes at redshift z~2-6,is dominant in the broad range of angular scales 200<l<3000. Poissonfluctuations due to bright sub-millimeter sources are more important at higherl, but since they are generated from the bright sources, such contributioncould be strongly reduced if bright sources are excised from the sky maps. Thecontribution of the correlation term to the angular power spectrum dependsstrongly on the redshift evolution of the escape fraction of UV photons and theresulting temperature of the dust. The measurement of this signal willtherefore give important information about galaxies in the early stage of theirevolution.

The clustering of merging star-forming haloes: dust emission as high frequency arcminute CMB foreground