The characteristic polarized radio continuum distribution of cluster spiral galaxies

Abstract

\n \nDeep observations are presented of the 6 cm polarized radio continuum emission of 8 Virgo spiral galaxies. All galaxies show strongly asymmetric distributions of polarized intensity with elongated ridges located in the outer galactic disk. These features are not found in existing observations\nof polarized radio continuum emission of field spiral galaxies, where the distribution\nof 6 cm polarized intensity is generally relatively symmetric and strongest in the interarm regions. \nWe therefore conclude that most Virgo spiral galaxies and, most probably, the majority of cluster spiral galaxies show asymmetric distributions of polarized radio continuum emission due to their interaction with the cluster environment. The polarized continuum emission is sensitive to compression and shear motions in the plane of the sky and thus contains important information about the velocity distortions caused by these interactions.\n\n