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Session 104 - IGM.
Display session, Thursday, January 16
NGC 7421 is a barred spiral displaced from the centre of its optical envelope, with a "bow-shock"-like western boundary, both suggestive of interaction with an intracluster medium. We have used 5 configurations of the Australia Telescope Compact Array to map the distribution and kinematics of the H\,\sc i in NGC 7421, and find supportive evidence for this scenario in the form of an H\,\sc i "wake". The ionised hydrogen kinematics and recent massive star formation have been traced using the Rutgers Fabry-Perot interferometer. From a comparison with ROSAT PSPC observations of the diffuse hot gas in the surrounding group of galaxies, we aim to test the hypothesis that NGC 7421 is interacting in some way with the intergalactic medium.
Program listing for Thursday