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Etude de galaxies à coquilles

Abstract : Shell galaxies are galaxies which look normal at first sight, but are surrounded with arc-like faint ''ripples'': the shells. It was not until the beginning of the 1980's that the importance of this phenomenon was clearly established, when Malin and Carter published a list of 140 shell galaxies, mainly ellipticals and lenticulars. A systematic observationnal programme in spectroscopy and CCD imaging, concerning all the galaxies from this list, was undertaken by the author in collaboration with some Australian and British astronomers. Quantitative results about the morphology and the photometry of the shells have been obtained. A recent burst star formation has been found in 20% of the objects. A correlation between the morphology of the shell systems and the apparent ellipticity of the galaxy has been discovered. This study contributes to establishing quite clearly that the merging model (accretion of a companion-galaxy) first proposed by Quinn in 1982, is the only one to account for the observationnal properties of the shells. With their behaviour as test-particules, the shell stars provide a unique opportunity to probe the total potential of the galaxies, including the invisible massive haloes.
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Contributor : Jean-Louis Prieur <>
Submitted on : Friday, December 6, 2013 - 11:59:51 PM
Last modification on : Thursday, October 15, 2020 - 4:07:29 AM
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  • HAL Id : tel-00915278, version 1



Jean-Louis Prieur. Etude de galaxies à coquilles. Cosmologie et astrophysique extra-galactique [astro-ph.CO]. Université Paul Sabatier - Toulouse III, 1988. Français. ⟨tel-00915278⟩



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