Point Sources in theWilkinson Microwave Anisotropy ProbeSky Maps

Elena Pierpaoli
2003 Astrophysical Journal  
We discuss point sources foregrounds for the MAP experiment. We consider several possible strategies for removing them and we assess how the statistics of the CMB signal are affected by the residual sources. Assuming a power law distribution for the point sources, we propose a method aimed to determine the slope of the distribution from the analysis of the moments of the observed maps. The same method allows for a determination of the underlying CMB variance. We conclude that the best strategy
more » ... or point sources finding is the simultaneous thresholding of the filtered map at all frequencies, with a relatively low threshold. With this strategy, we expect to find 70 (95) sources above 3 (4) σ. Assuming the most conservative case for point sources detection, the recovered slope of the point sources distribution is 2.55 ± 0.15, for a fiducial n=2.5 value. The recovered CMB pus noise map variance is within 0.2
doi:10.1086/374410 fatcat:5d5gxenrmbc37botgo2fkvi5si