Volume 389, Number 1, July I 2002
|Page(s)||58 - 67|
|Section||Cosmology (including clusters of galaxies)|
|Published online||14 June 2002|
Milli-arcsecond scale rotation measure in the CSS quasars 0548+165 and 1524-136
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, email@example.com
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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