EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 389/1 Article
Free access article

Issue A&A
Volume 389, Number 1, July I 2002
Page(s) 58 - 67
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20020482



A&A 389, 58-67 (2002)
DOI: 10.1051/0004-6361:20020482

Milli-arcsecond scale rotation measure in the CSS quasars 0548+165 and 1524-136

F. Mantovani1, W. Junor2, R. Ricci1, 3, D. J. Saikia4, C. Salter5 and M. Bondi1

1  Istituto di Radioastronomia, CNR, via P. Gobetti 101, Bologna, Italy
2  University of New Mexico, Albuquerque, New Mexico 87131, USA
3  Scuola Internazionale Superiore di Studi Avanzati, via Beirut 4, 34014 Trieste, Italy
4  National Centre for Radio Astrophysics, TIFR, Post Bag 3, Ganeshkhind, Pune, 411007, India
5  Arecibo Observatory, HC3 Box 53995, Arecibo, Puerto Rico PR 00612, USA

(Received 18 December 2001 / Accepted 3 March 2002)

Abstract
Two Compact Steep-spectrum Sources (CSSs), 0548+165 and 1524-136, chosen from a list of CSSs with polarization percentages that decrease with decreasing frequency and high rotation measure values ( RM>450 rad m -2) on arcsecond scales, were observed with the VLBA at 4.9 and 8.4 GHz. RM values up to $\approx$ 104 rad m -2 were found in several regions along the jets in both sources. We suggest that a thin screen of magneto-ionic material with about 1 kpc thickness is responsible for these high RMs. The observed depolarization may be due to beam depolarization and/or inhomogeneities in the magnetic field.


Key words: techniques: interferometric -- polarization -- galaxies: individual: 0548+165 -- galaxies: individual: 1524-136

Offprint request: F. Mantovani, fmantovani@ira.bo.cnr.it

SIMBAD Objects



© ESO 2002


What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.