Galactic Synchrotron Foreground and the CMB Polarization Measurements

Details Galactic Synchrotron Foreground and the CMB Polarization Measurements Galactic Synchrotron Foreground and the CMB Polarization Measurements

2002-09-19

arxiv.org/abs/astro-ph/0209400v1

Astronomy and Astrophysics

Astrophysics

28 pages, 13 figures, submitted to MNRAS

Scientific paper

The polarization of the Cosmic Microwave Background (CMB)is a powerful observational tool at hand for modern cosmology. It allows to break the degeneracy of fundamental cosmological parameters one cannot obtain using only anisotropy data and provides new insight into conditions existing in the very early Universe. Many experiments are now in progress whose aim is detecting anisotropy and polarization of the CMB. Measurements of the CMB polarization are however hampered by the presence of polarized foregrounds, above all the synchrotron emission of our Galaxy, whose importance increases as frequency decreases and dominates the polarized diffuse radiation at frequencies below $\simeq 50$ GHz. In the past the separation of CMB and synchrotron was made combining observations of the same area of sky made at different frequencies. In this paper we show that the statistical properties of the polarized components of the synchrotron and dust foregrounds are different from the statistical properties of the polarized component of the CMB, therefore one can build a statistical estimator which allows to extract the polarized component of the CMB from single frequency data also when the polarized CMB signal is just a fraction of the total polarized signal. This estimator improves the signal/noise ratio for the polarized component of the CMB and reduces from about 50 GHz to about 20 GHz the frequency above which the polarized component of the CMB can be extracted from single frequency maps of the diffuse radiation.

Affiliated with

Also associated with

No associations

Rating

Galactic Synchrotron Foreground and the CMB Polarization Measurements does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Galactic Synchrotron Foreground and the CMB Polarization Measurements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Galactic Synchrotron Foreground and the CMB Polarization Measurements will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-537622