Predictions on high frequency polarization properties of extragalactic radio sources and implications for CMB polarization measurements

Details Predictions on high frequency polarization properties of extragalactic radio sources and implications for CMB polarization measurements Predictions on high frequency polarization properties of extragalactic radio sources and implications for CMB polarization measurements

2003-07-03

arxiv.org/abs/astro-ph/0307073v2

Mon.Not.Roy.Astron.Soc.349:1267,2004

Astronomy and Astrophysics

Astrophysics

13 pages, 11 figures, 5 tables. Accepted version for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2004.07593.x

We present a method to simulate the polarization properties of extragalactic radio sources at microwave frequencies. Polarization measurements of nearly 2x10^6 sources at 1.4 GHz are provided by the NVSS survey. Using this catalogue and the GB6 survey, we study the distribution of the polarization degree of both steep- and flat-spectrum sources. We find that the polarization degree is anti-correlated with the flux density for the former population, while no correlation is detected for the latter. The available high-frequency data are exploited to determine the frequency dependence of the distribution of polarization degrees. Using such information and the evolutionary model by Toffolatti et al. (1998), we estimate the polarization power spectrum of extragalactic radio sources at \geq 30 GHz and their contamination of CMB polarization maps. Two distinct methods to compute point-source polarization spectra are presented, extending and improving the one generally used in previous analyses. While extragalactic radio sources can significantly contaminate the CMB E-mode power spectrum only at low frequencies (<30 GHz), they can severely constrain the detectability of the CMB B-mode up to ~100 GHz.

Affiliated with

Also associated with

No associations

Rating

Predictions on high frequency polarization properties of extragalactic radio sources and implications for 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 Predictions on high frequency polarization properties of extragalactic radio sources and implications for CMB polarization measurements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Predictions on high frequency polarization properties of extragalactic radio sources and implications for CMB polarization measurements will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-654652