Dust deficiency in Virgo spirals

Astronomy and Astrophysics – Astronomy

Scientific paper

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Cosmic Dust, Galactic Structure, Infrared Astronomy, Interstellar Matter, Spiral Galaxies, Virgo Galactic Cluster, Astronomical Models, Far Infrared Radiation, Infrared Astronomy Satellite, Interstellar Radiation, Star Formation

Scientific paper

The results of an analysis of FIR and 21-cm data for a sample of 102 spiral galaxies in the Virgo cluster are presented. It it shown that H-I deficient galaxies have lower 60-micron and 100-micron fluxes and cooler FIR color temperatures than those with normal H-I content. No reasonable selection or systematic effect can account for these variations. These results are interpreted in the context of a two-component model for the far-infrared emission: a warm component associated with star formation and H-II regions, and a cool 'cirrus-like' component of dust heated by the interstellar radiation field. It is found that, for a typical spiral in the core of the cluster, at least half of the diffuse dust has been stripped and the star formation activity suppressed by a factor of three, compared to normal field galaxies.

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