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Date and Time of the Query: 2019-05-19 T22:31:00 PDT
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For refcode 1989A&A...215..266N:
Retrieve 34 NED objects in this reference.
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1989A&A...215..266N Boxiness in elliptical galaxies J.-L. Nieto and R. Bender Observatoire Midi-Pyrenees, Unite Associe du CNRS n^deg^ 285, 14 Avenue Edouard Belin, F-31400 Toulouse, France Landessternwarte Heidelberg, Konigstuhl, D-6900 Heidelberg, Federal Republic of Germany Received September 7, accepted December 26, 1988 Summary. Systematic departures from ellipticity of isophote shapes are analysed in a sample of 34 boxy E galaxies. Two types of boxiness appear either pure boxiness or boxiness coexisting with disk-type departures. Three main classes of boxy E's appear, whose type of boxiness clearly correlates with other physical properties: (a) Purely boxy massive E's (20 objects): these mostly anisotropic, triaxial systems correlate with radio, X-ray emission and present signatures of merging processes, so that boxiness is likely to be due to merging processes or interactions of all kinds. (b) Purely boxy low-mass companions to massive galaxies (3 objects): these objects are rotationally flattened and present signs of tidal truncation. We suggest that boxiness is related to the interaction with the massive neighbour via tidal stripping of the disk or tidal torques. (c) Boxy disk-E's with inner disk and outer boxiness (7 objects): these objects are rotationally flattened and present no sign of merging signatures. They are assumed to belong to the class of disk-E's recently discussed, e.g. S0-like objects at the low end of the L_D_/L_T_ sequence of (early-type) galaxies. Some disk-E's are boxy as well as some bulges in S0's and spirals are, however no peanut shape occurs in this sample of disk-E's. These considerations fit quite well with the recent suggestion of two classes of E galaxies, namely disk-E's and merger products, provided boxiness is not automatically attributed to merger products, as believed before: pure boxiness only should be related to merger products while boxiness coexisting with disk-type departures pertain to boxy disk-E's, objects physically similar to boxy bulges in other disk-systems. Key words: galaxies: ellipticals - ellipticals galaxies: isophote shapes - galaxies: formation
Retrieve 34 NED objects in this reference.
Please click here for ADS abstract

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