Combined multi-frequency map for point source substraction

Details Combined multi-frequency map for point source substraction Combined multi-frequency map for point source substraction

2001-11-08

arxiv.org/abs/astro-ph/0111168v1

Mon.Not.Roy.Astron.Soc. 335 (2002) 550

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1046/j.1365-8711.2002.05525.x

A method is proposed for combining multi-frequency maps in order to produce a catalogue of extragalactic point sources using data from future high-precision satellite experiments. We have found the optimal way for combining maps at different frequencies in order to maximize the signal (point sources) to noise (rest of the signal) ratio. Our approach is a natural multi-frequency generalization of the band-pass filter introduced by Tegmark and de Oliveira-Costa (1998). We show that combination of different frequency maps gives us the possibility of creating a more complete catalogue of point sources.

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