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For refcode 1992A&A...257...97N:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1992A&A...257...97N The origin of inner isophotal twists in elliptical galaxies J.-L. Nieto, R. Bender, P. Poulain, and P. Surma Observatoire Midi-Pyrenees, Unite Associee au CNRS 285,14 Avenue Edouard Belin, F-3 1400 Toulouse, France Canada-France-Hawaii Telescope Corporation, P.O. Box 1597, Kamuela, HI 96743, USA Landessternwarte, Konigstuhl, W-6900 Heidelberg, Germany Received May 28, accepted September 25, 1991 Abstract. The analysis of the projected geometry of 99 elliptical galaxies listed in the Revised Shapley-Ames Catalog of Bright Galaxies reveals that 16 of them have inner isophotal twists larger than 20 degrees, which cannot be attributed to internal dust absorption. For 12 of them, the profiles of the position angle, ellipticity and axisymmetric coefficients of the Fourier expansion of their isophotal contours, show features all correlated with each other, a result consistent with the assumption that these objects are at least two-component systems. Detailed features in the profiles of these parameters resemble scale-down structures found in a comparison sample of SB0 galaxies, which indicates the presence of bars generally accompanied with disks. It is suggested that: (a) a significant fraction of isophotal twists, in relation with changes of isophotal shapes, and internal kinematics, is due to the SB0- like or (more generally) to the two-component nature of many E galaxies, (b) large-scale disks in E's are cold systems formed dissipatively at early stages in the history of these galaxies and not in recent mergings, (c) there is a strong continuity in morphological properties between S0/SB0s and E's where bars and disks have been unambiguously detected, and (d) a significant percentage of triaxial systems may not have the form of pure ellipsoids. Key words: galaxies: ellipticals - elliptical galaxies: structure, isophotal shapes, kinematics, formation
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