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NGC 7421: Surfing the Intracluster Medium?

Published online by Cambridge University Press:  05 March 2013

Stuart D. Ryder ,
G. Purcell ,
D. Davis  and
V. Andersen
Stuart D. Ryder
Affiliation:
School of Physics, University of New South Wales, Sydney, NSW 2052, Australia; sdr@newt.phys.unsw.edu.au
G. Purcell
Affiliation:
Department of Physics & Astronomy, University of Alabama, Box 870324, Tuscaloosa, AL 35487-0324, USA; purcell@crux.astr.ua.edu
D. Davis
Affiliation:
Department of Physics & Astronomy, University of Alabama, Box 870324, Tuscaloosa, AL 35487-0324, USA; davis@crux.astr.ua.edu
V. Andersen
Affiliation:
Department of Physics & Astronomy, University of Alabama, Box 870324, Tuscaloosa, AL 35487-0324, USA; andersen@crux.astr.ua.edu
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Abstract

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NGC 7421 is a barred spiral that is displaced from the centre of its optical envelope, and has a ‘bow-shock’-like western boundary, both suggestive of interaction with an intracluster medium. We have used five configurations of the ATCA to map the distribution and kinematics of HI in NGC 7421, and find supportive evidence for this scenario in the form of an HI ‘wake’. When compared with ROSAT PSPC observations of the diffuse hot gas in the surrounding group of galaxies, these new ATCA results will allow us to place new constraints on the density and dynamics of the intracluster medium.

Keywords

galaxies: individual (NGC 7421)galaxies: kinematics and dynamicsgalaxies: intergalactic mediumradio lines: galaxies
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 14 , Issue 1 , 1997 , pp. 81 - 84
Copyright
Copyright © Astronomical Society of Australia 1997

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