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Astron. Astrophys. 326, 919-923 (1997)

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Asymmetric depolarization
in double low-luminosity radio galaxies

R. Morganti 1, 2, P. Parma 1, A. Capetti 3, R. Fanti 1, 4 and H.R. de Ruiter 1, 5

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

Received 2 January 1997 / Accepted 13 May 1997

Abstract

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

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© European Southern Observatory (ESO) 1997

Online publication: April 8, 1998
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