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17th of June 2015
ATNF Colloquium
A wide-field investigation into the HI content of galaxies
by Helga Denes (CASS)
Abstract. The environment of a galaxy can play a major role in its evolution. Late-type gas-rich galaxies can be transformed into gas-poor early-type galaxies in dense environments. Observations show that spiral galaxies in galaxy cluster tend to have on average less neutral hydrogen (HI) than galaxies of the same type and size in the field. Recently there is accumulating evidence that HI-deficient galaxies are also relatively frequent in galaxy groups and that galaxy transformation can already start in the group environment. In this talk I will investigate how the environment influences the HI content of galaxies, and which mechanisms are responsible for the gas deficiency in galaxy groups?

The color-composite image above shows the extremely HI-poor spiral galaxy ESO 009-G010: blue - GALEX UV, green - DSS optical B-band, and red - ATCA HI distribution.

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