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Spiral Galaxy - ICM Interactions in the Virgo Cluster

Published online by Cambridge University Press:  26 May 2016

Jeffrey D. P. Kenney ,
Hugh Crowl ,
Jacqueline van Gorkom  and
Bernd Vollmer
Jeffrey D. P. Kenney
Affiliation:
Yale University, New Haven, CT, USA
Hugh Crowl
Affiliation:
Yale University, New Haven, CT, USA
Jacqueline van Gorkom
Affiliation:
Columbia University, New York, NY, USA
Bernd Vollmer
Affiliation:
Observatoire Astronomique de Strasbourg, Strasbourg, France

Abstract

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We discuss HI and optical evidence for ongoing ICM-ISM interactions in 6 Hi-deficient Virgo cluster spiral galaxies. One of the clearest cases is the highly inclined Virgo galaxy NGC 4522, which has a normal stellar disk but a truncated gas disk, and lots of extraplanar gas right next to the gas truncation radius in the disk. Unusually strong HI, Hα and radio continuum emission are all detected from the extraplanar gas. The radio continuum polarized flux and spectral index peak on the side opposite the extraplanar gas, suggesting ongoing pressure by the ICM. Four other HI-deficient edge-on Virgo spirals show evidence of extraplanar ISM gas or exhibit asymmetries in their disk HI distributions, but contain much less extraplanar HI than NGC 4522. Comparison with recent simulations suggests this difference may be evolutionary, with large surface densities of extraplanar gas observed only in early phases of an ICM-ISM interaction. In NGC 4569, the Hα image shows 2 effects of ICM pressure on the galaxy ISM. An anomalous arm of HII regions, possibly extraplanar, emerges from the edge of a truncated Hα disk. This resembles the arms seen in simulations which are formed by the combined effects of wind pressure plus rotation. An extended nebulosity near the minor axis, also in the NW, is interpreted as a starburst outflow bubble disturbed by ICM wind pressure.

Type
Part 3. Ejection and Outflow
Information
Symposium - International Astronomical Union , Volume 217: Recycling Intergalactic and Interslettar Matter , 2004 , pp. 370 - 375
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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