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Two modified ILC methods to detect point sources in Cosmic Microwave Background maps
An approach with local background subtraction

R. Vio, P. Andreani, E. P. G. Ramos, A. C. da Silva

Abstract
We propose two detection techniques that take advantage of a small sky area approximation and are based on modifications of the internal linear combination (ILC) method, an approach widely used in Cosmology for the separation of the various components that contribute to the microwave background. The main advantage of the proposed approach, especially in handling multi-frequency maps of the same region, is that it does not require the a priori knowledge of the spatial power-spectrum of either the CMB and/or the Galactic foreground. Hence, it is more robust, easier and more intuitive to use. The performance of the proposed algorithms is tested with numerical experiments that mimic the physical scenario expected for high Galactic latitude observations with the Atacama Large Millimeter/submillimeter Array (ALMA).

Keywords
Methods: data analysis - Methods: statistical - Cosmology: cosmic microwave background

Astronomy and Astrophysics
Submitted

Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia