A&A 418, 1-6 (2004)
DOI: 10.1051/0004-6361:20035759

Radio continuum spectra of galaxies in the Virgo cluster region

B. Vollmer^{1, 2}, M. Thierbach² and R. Wielebinski<sup>2

1</sup>  CDS, Observatoire astronomique de Strasbourg, UMR 7550, 11 rue de l'université, 67000 Strasbourg, France
²  Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany

(Received 28 November 2003 / Accepted 21 December 2003 )

Abstract
New radio continuum observations of galaxies in the Virgo cluster region at 4.85, 8.6, and 10.55 GHz are presented. These observations are combined with existing measurements at 1.4 and 0.325 GHz. The sample includes 81 galaxies where spectra with more than two frequencies could be derived. Galaxies that show a radio-FIR excess exhibit central activity (HII, LINER, AGN). The four Virgo galaxies with the highest absolute radio excess are found within 2 of the center of the cluster. Galaxies showing flat radio spectra also host active centers. There is no clear trend between the spectral index and the galaxy's distance to the cluster center.

Key words: galaxies: clusters: individual: Virgo -- galaxies: evolution -- galaxies: magnetic fields -- radio continuum: galaxies

Offprint request: B. Vollmer, bvollmer@astro.u-strasbg.fr

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