EDP Sciences
Free access
Volume 391, Number 2, August IV 2002
Page(s) 789 - 794
Section Instruments, observational techniques and data processing
DOI http://dx.doi.org/10.1051/0004-6361:20020821

A&A 391, 789-794 (2002)
DOI: 10.1051/0004-6361:20020821

On optimal detection of point sources in CMB maps

R. Vio1, 2, L. Tenorio3 and W. Wamsteker2

1  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: willem.wamsteker@esa.int
3  Department of Mathematical and Computer Sciences, Colorado School of Mines, Golden CO 80401, USA
    e-mail: ltenorio@Mines.EDU

(Received 15 January 2002 / 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

Offprint request: R. Vio, robertovio@tin.it

© ESO 2002