Fredagskollokvium: Spatially varying CMB foregrounds

When analyzing the Cosmic Microwawe Background (CMB) one of the most important issues is to extract the foregrounds from the true CMB signal. Foregrounds are radiation in the same frequencies as the CMB but of another origin. While the CMB have travelled since recombination, a period after inflation, foregrounds are radiation from our own and nearby galaxies.
In this talk I will show the different types of foregrounds and explain the models we use to extract them from the CMB. A few years back one assumed spatially constant foregrounds while now, with new and more sensitive CMB maps we have started to investigate how they vary spatially on the sky. I will show the results from the paper Fuskeland et al. 2014 (*) where we did an analysis of how the polarized synchrotron foreground varies on the sky.
Towards the end I will point to future experiments which are needed to better pinpoint the CMB foregrounds. This is related to a project I am currently working on.

(*) http://arxiv.org/abs/1404.5323