Calibration of the GEM synchrotron emission map using the ARCADE 2 experiment data / Calibração do mapa de emissão síncrotron do radiotelescópio GEM utilizando os dados de temperatura absoluta do experimento ARCADE 2

AUTOR(ES)

Mariana Chinaglia

FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

24/02/2011

RESUMO

The motivation of this work is to produce a synchrotron emission map in a range of frequencies not yet well mapped, between 408 MHz and 23 GHz, in order to assist the foreground separation process on the data analysis of the Cosmic Microwave Background (CMB) radiation. We used the data from GEM (Galactic Emission Mapping) telescope, whose dominant processes in the frequencies mesured is the synchrotron emission. Its map was calibrated with the Rhodes/HartRAO experiment. However, this radiotelescope is not as well calibrated as is the ARCADE 2 (\textit{Absolute Radiometer for Cosmology, Astrophysics and Diffuse Emission}). Our goal is to make a second calibration in the Galactic emission map produced with the GEM radiotelescope using the ARCADE 2 experiment temperature data. We used the GEM experiment in 2,3 GHz with an angular resolution of $\sim$2° and the ARCADE 2 frequencies at 3 GHz, 8 GHz, and 10 GHz, all of them with an angular resolution of (11,6°). In order to do a better calibration, the GEM map was divided into three regions: Galactic plan, region outside the Galactic plan - with high emission, region outside the Galactic plan - with low emission. Comparisons between these regions in GEM and in ARCADE maps resulted in three calibration constants. Once calibrated, the GEM map was with a good signal to noise ratio in Galactic plan region, 1.51597, and lowest in the region of low emission outside the plan, 0.275537, and high emission outside the plan, 0.279175. These results will be used to produce a new template for synchrotron emission.

ASSUNTO(S)

radiação cósmica de fundo (rcf) síncrotron cosmologia cosmic microwave background (cmb) synchrotron cosmology

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