Extragalactic Source Counts and Contributions to the Anisotropies of the Cosmic Microwave Background. Predictions for the Planck Surveyor mission

摘要

We present predictions for the counts of extragalactic sources, thecontributions to fluctuations and their spatial power spectrum in each channelforeseen for the Planck Surveyor (formerly COBRAS/SAMBA) mission. Thecontribution to fluctuations due to clustering of both radio and far--IRsources is found to be generally small in comparison with the Poisson term;however the relative importance of the clustering contribution increases andmay eventually become dominant if sources are identified and subtracted down tofaint flux limits. The central Planck frequency bands are expected to be``clean'': at high galactic latitude (|b|>20), where the reduced galactic noisedoes not prevent the detection of the extragalactic signal, only a tinyfraction of pixels is found to be contaminated by discrete extragalacticsources. Moreover, removal of contaminating signals is eased by the substantialdifference between their power spectrum and that of primordial fluctuations.