Issue |
A&A
Volume 389, Number 1, July I 2002
|
|
---|---|---|
Page(s) | 58 - 67 | |
Section | Cosmology (including clusters of galaxies) | |
DOI | https://doi.org/10.1051/0004-6361:20020482 | |
Published online | 14 June 2002 |
Milli-arcsecond scale rotation measure in the CSS quasars 0548+165 and 1524-136
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
Corresponding author: F. Mantovani, fmantovani@ira.bo.cnr.it
Received:
18
December
2001
Accepted:
3
March
2002
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 ( rad m-2)
on arcsecond scales, were observed with the VLBA at 4.9 and
8.4 GHz. RM values up to ≈
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
© ESO, 2002
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