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Evidence for Gas Accretion in Galactic Disks

Published online by Cambridge University Press:  26 May 2016

Thijs van der Hulst  and
Renzo Sancisi
Thijs van der Hulst
Affiliation:
Kapteyn Astronomical Institute, P.O. Box 800, NL-9700 AV Groningen, The Netherlands
Renzo Sancisi
Affiliation:
Osservatorio Astronomico, Via Ranzani 1, I-40127 Bologna, Italy and Kapteyn Astronomical Institute, Groningen, The Netherlands

Abstract

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Studies of the HI in galaxies have clearly shown that subtle details of the HI distribution and kinematics often harbour key information for understanding the structure and evolution of galaxies. Evidence for the accretion of material has grown over the past many years and clear signatures can be found in HI observations of galaxies. We have obtained new detailed and sensitive HI synthesis observations of three nearby galaxies which are suspected of capturing small amounts of HI and show that indeed accretion of small amounts of gas is taking place in these galaxies. This could be the same kind of phenomenon of material infall as observed in the stellar streams in the halo and outer parts of our galaxy and M 31.

Type
Part 2. Origin
Information
Symposium - International Astronomical Union , Volume 217: Recycling Intergalactic and Interslettar Matter , 2004 , pp. 122 - 129
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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