A multifrequency method based on the Matched Multifilter for the detection of point sources in CMB maps

Details A multifrequency method based on the Matched Multifilter for the detection of point sources in CMB maps A multifrequency method based on the Matched Multifilter for the detection of point sources in CMB maps

2009-07-03

arxiv.org/abs/0907.0603v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

14 pages, 6 figures, 1 table

Scientific paper

In this work we deal with the problem of simultaneous multifrequency detection of extragalactic point sources in maps of the Cosmic Microwave Background. We apply a linear filtering technique that uses spatial information and the cross-power spectrum. To make this, we simulate realistic and non-realistic flat patches of the sky at two frequencies of Planck: 44 and 100 GHz. We filter to detect and estimate the point sources and compare this technique with the monofrequency matched filter in terms of completeness, reliability, flux and spectral index accuracy. The multifrequency method outperforms the matched filter at the two frequencies and in all the studied cases in the work.

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