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Astron. Astrophys. 326, 919-923

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Asymmetric depolarization
in double low-luminosity radio galaxies

R. Morganti1,2, P. Parma1, A. Capetti3, R. Fanti1,4, and H.R. de Ruiter1,5

1Istituto di Radioastronomia, CNR, Via Gobetti 101, I-40129 Bologna, Italy
2Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 2121, Australia
3Scuola Internazionale Superiore di Studi Avanzati, Via Beirut 2-4, I-34014 Trieste, Italy
4Dipartimento di Fisica, Università di Bologna, Via Irnerio 46, I-40126 Bologna, Italy
5Osservatorio Astronomico di Bologna, via Zamboni 33, I-40126 Bologna, Italy

Received 2 January 1997 / Accepted 13 May 1997


To investigate the presence of the Laing-Garrington effect (i.e. the lobe containing the jet more depolarized than that containing the counter-jet), we analyse polarization data at 6 and 20 cm for a sample of double low-luminosity radio galaxies. The effect is well visible, although not very strong. We therefore confirm what was inferred in a previous paper based on data at one frequency (20 cm) only. Furthermore, we find that radio galaxies with strong radio cores show a more pronounced asymmetry in depolarization. We conclude that the presence of the Laing-Garrington effect in our sample is a indication that relativistic motions do occur on the kpc scale of low-luminosity radio galaxies as recently suggested by theoretical arguments and observational evidence.

Key words: radio continuum: galaxies - galaxies: active - polarization - galaxies: jets

Send offprint requests to: R. Morganti

© European Southern Observatory (ESO) 1997

Online publication: October 1, 1997
Last change: April 8, 1998