Present star formation in sprials of the Virgo cluster

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Models, Galactic Evolution, Spiral Galaxies, Star Formation, Virgo Galactic Cluster, Hubble Diagram, Morphology, Predictions, Stellar Mass

Scientific paper

From a study of spiral galaxies in the Virgo Cluster (VC), it is shown that the RDDO anemics with smooth arms and no sign of present formation of (massive) stars have HI surface densities below a threshold value of 2 to 5 x 10 to the 20th power atoms/sq cm. This value is very consistent with predictions of theoretical models. It is likely that the HI disks of VC HI-deficient RDDO anemics were deeply affected by ram pressure stripping in the gaseous intracluster medium, while VC HI deficient RDDO spirals were only peripherally stripped.

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