Polarized Radio Sources in forthcoming Cosmic Microwave Background polarization measurements.

AULA OVEST: Friday, June 07, time: 11.30

ORGANIZER: Nuccio Lanza (antonino.lanza@inaf.it)

SPEAKER: Giuseppe Puglisi (PostDoc (PhD at SISSA, Trieste))

INSTITUTION: Dept. of Physics, Stanford University, CA, USA

TITLE:
Polarized Radio Sources in forthcoming Cosmic Microwave Background polarization measurements.

ABSTRACT:
In the last decade,  huge efforts have been made to measure the polarization of the Cosmic  Microwave Background, in order to find the imprints on its polarized anisotropies of a stochastic background of primordial gravitational waves  that might have been produced during the inflationary phase, commonly referred as CMB B-modes. These primordial anisotropies  are expected to peak at large angular scales  (> degree).  To date, several challenges have prevented the detection of primordial B-modes mostly because of the diffuse polarized radiation coming from the Milky Way. On smaller angular  scales, extragalactic polarized  emission from Radio and Star-forming galaxies represent the major contamination to CMB polarization.  To date, several ground-based experiments are updating their cameras to achieve high sensitivities in order to ultimately constrains CMB B-modes. As a  consequence, an increasing number of  polarized radio sources will be detected and surveyed  in the forthcoming CMB measurements. In my talk I will outline the state of the art of CMB B-modes constraints and  show the forecasts for extragalactic sources that will be detected in  mm and sub-mm wavelengths.