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Speaker : Dr. Tom Scott (University of Hertfordshire)

TITLE : EVOLUTION OF LATE-TYPE GALAXIES IN GALAXY CLUSTERS: COLD GAS

 

ABSTRACT : There is evidence linking the galaxy cluster environment to the removal of cold gas from its late-type galaxies, which in turn leads to the quenching of their star formation. At low z the consensus view is that ram pressure stripping is the dominant process driving this gas removal, although this remains controversial. We are undertaking HI and molecular gas studies in the late-type galaxies of the cluster Abell 1367 (z ~0.02), which is undergoing an equal mass merger. Abell 1367s late-type galaxies display widespread HI and molecular gas signatures, which are inconsistent with current ram pressure stripping models. We are now investigating what mechanisms produce the abnormal HI and molecular gas signatures and whether they are specific to merging clusters in general.