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Imaging of the shell galaxies NGC 474 and 7600, and implications for their formation

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We present photometric observations of two shell galaxies, NGC 474 and 7600. We examine the photometric colours and surface brightnesses of the shells and their host galaxies, and the isophotal parameters of each galaxy. In the case of NGC 474, we find that the shell formation is consistent with a merger origin, although it is possible that the close companion NGC 470 is contributing to the shell system via mass transfer. NGC 7600 exhibits shell geometry and colours which also favour a merger origin.
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Keywords: galaxies: evolution; galaxies: individual: NGC 474; galaxies: individual: NGC 7600; galaxies: interactions; galaxies: photometry

Document Type: Research Article

Affiliations: 1: Department of Physical Sciences, University of Hertfordshire, Hatfield, College Lane, Herts AL10 9AB 2: Institute of Astronomy, Madingley Road, Cambridge CB3 0HA 3: Liverpool John Moores University, Astrophysics Research Institute, Twelve Quays House, Egerton Wharf, Birkenhead L41 1LD

Publication date: 21 August 1999

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