On Optimal Detection of Point Sources in CMB Maps

Details On Optimal Detection of Point Sources in CMB Maps On Optimal Detection of Point Sources in CMB Maps

2002-04-05

arxiv.org/abs/astro-ph/0204101v1

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures

Scientific paper

10.1051/0004-6361:20020821

Point-source contamination in high-precision Cosmic Microwave Background (CMB) maps severely affects the precision of cosmological parameter estimates. Among the methods that have been proposed for source detection, wavelet techniques based on ``optimal'' filters have been proposed.In this paper we show that these filters are in fact only restrictive cases of a more general class of matched filters that optimize signal-to-noise ratio and that have, in general, better source detection capabilities, especially for lower amplitude sources. These conclusions are confirmed by some numerical experiments. \keywords{Methods: data analysis -- Methods: statistical

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