Volume 391, Number 2, August IV 2002
|Page(s)||789 - 794|
|Section||Numerical methods and codes|
|Published online||02 August 2002|
On optimal detection of point sources in CMB maps
Chip Computers Consulting s.r.l., Viale Don L. Sturzo 82, S.Liberale di Marcon, 30020 Venice, Italy
2 ESA-VILSPA, Apartado 50727, 28080 Madrid, Spain e-mail: email@example.com
3 Department of Mathematical and Computer Sciences, Colorado School of Mines, Golden CO 80401, USA e-mail: ltenorio@Mines.EDU
Corresponding author: R. Vio, firstname.lastname@example.org
Accepted: 31 May 2002
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, the family of pseudo-filters optimizes a measure of signal-to-noise and amplitude-scale relation. 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.
Key words: methods: data analysis / methods: statistical
© ESO, 2002
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