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Date and Time of the Query: 2019-06-17 T19:11:25 PDT
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For refcode 1996A&A...307..391P:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1996A&A...307..391P Extended ionized gas in elliptical galaxies I. Multicomponents in NGC 1052 and NGC 7332 H. Plana and J. Boulesteix Observatoire de Marseille, 2 Place Le Verrier, F-l3248 Marseille Cedex 04, France September 25,1995 Abstract. A number of elliptical galaxies possess an extended gaseous disk usually detected in [OIII] 5007 A, H{alpha} or [NII] 6583 A emission lines. 3-D scanning Perot-Fabry observations of two of these objects, NGC 1052 and NGC 7332, show multiple profiles of the ionized faint and extended gas. We separate clearly two extended gaseous components in both galaxies where gas kinematics is largely decoupled from stellar one. Several gas systems, kinematically decoupled and possibly located in different basic planes of the ellipsoids, could be related to different external origins. We used gas kinematics to constraint the triaxial shape of these galaxies. Both present a typical gaseous disk which may lie in an allowed preferred plane of the ellipsoid. But there is no clear coherence between dynamical parameters derived separately from the gaseous disks. Different hypothesis, in which one component is not definitively stable, are presented. They suppose that successive mergers occurred within a relatively small time scale. Key words: galaxies: elliptical and lenticular; kinematics and dynamics; NGC 1052; NGC 7332
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