Science-advisor
REGISTER info/FAQ
Login
username
password
     
forgot password?
register here
 
Research articles
  search articles
  reviews guidelines
  reviews
  articles index
My Pages
my alerts
  my messages
  my reviews
  my favorites
 
 
Stat
Members: 3643
Articles: 2'488'730
Articles rated: 2609

29 March 2024
 
  » arxiv » astro-ph/0312163

 Article overview


High-frequency polarization properties of southern Kuhr sources
R. Ricci ; I. Prandoni ; C. Gruppioni ; R.J. Sault ; G. De Zotti ;
Date 5 Dec 2003
Journal Astron.Astrophys. 415 (2004) 549-558
Subject astro-ph
AffiliationSISSA/Atnf), I. Prandoni (IRA-CNR), C. Gruppioni (INAF-Oab), R.J. Sault (ATNF), G. De Zotti (INAF-Oapd/Sissa
AbstractWe have carried out observations at 18.5 GHz with the Australia Telescope Compact Array (ATCA) of 250 out of the 258 Southern extragalactic sources in the complete 5 GHz 1 Jy sample by Kühr et al. (1981). In this paper we focus on the polarization properties of this sample, while other properties will be addressed in a future paper. In our analysis we subdivide the sample into flat and steep spectrum sources following Stickel et al. (1994) classification, where spectral indices were measured between 2.7 and 5 GHz. The polarized flux has been measured with a S/N > 5 for 170 sources (114 flat-spectrum and 56 steep-spectrum) and upper limits have been set for additional 27 sources (12 flat-spectrum and 15 steep-spectrum). The median polarization degree at 18.5 GHz for the flat-spectrum sub-sample is Pi_{18.5}simeq 2.7%, about a factor of 2 higher than at 1.4 GHz (Pi_{1.4}simeq 1.4%, based on NVSS data). For flat-spectrum sources we find a weak correlation between Pi_{18.5} and the high frequency (5--18.5 GHz) spectral index. No evidences of significant correlations of the polarization degree with other source properties are found. The median value of Pi_{18.5} for the steep spectrum sources is simeq 4.8%, but our sample might be biased against extended sources. We find indications of a correlation between Pi_{18.5} and both the low frequency (1.4--5 GHz) and the high frequency (5--18.5 GHz) spectral indices. An important application of this work is the possibility to estimate the contamination of CMB polarization maps by extragalactic radio sources. Our results indicate that such contamination is within the range of estimates given by Mesa et al. (2002).
Source arXiv, astro-ph/0312163
Services Forum | Review | PDF | Favorites   
 
Visitor rating: did you like this article? no 1   2   3   4   5   yes

No review found.
 Did you like this article?

This article or document is ...
important:
of broad interest:
readable:
new:
correct:
Global appreciation:

  Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.

browser claudebot






ScienXe.org
» my Online CV
» Free


News, job offers and information for researchers and scientists:
home  |  contact  |  terms of use  |  sitemap
Copyright © 2005-2024 - Scimetrica