Point Sources in the Context of Future SZ Surveys

We look at the impact of Infra-Red (IR) and radio point sources on upcominglarge yield Sunyaev-Zel'dovich (SZ) cluster surveys such as APEX, SPT and ACT.The IR and radio point source counts are based on observations by the the SCUBAand WMAP instruments respectively. We show that the contributions from IRsource counts, when extrapolated from the SCUBA frequency of 350GHz to theoperating frequencies of these surveys (~100-300GHz), can be a significantsource of additional `noise' which needs to be accounted for in order toextract the optimal science from these surveys. Alternatively, these surveysgive us an opportunity to study IR sources, their numbers and clusteringproperties, opening a new window to the high redshift universe. For the radiopoint sources, the contribution depends on a more uncertain extrapolation from40GHz but is comparable to the IR near 200GHz. However, the radio signal may becorrelated with clusters of galaxies and have a disproportionately largereffect.Comment: 6 pages, 4 figures. Matches version accepted by ApJ. Radio source count extrapolation modified, reducing confusion estimate