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Triaxiality in elliptical galaxies

Journal Article:

Abstract

The existence of a triaxial shape for elliptical galaxies has been considered in recent years to explain the new kinematical and geometrical findings, i.e. (a) the low rotation/velocity dispersion ratio found also in some flat systems, (b) the presence of twisting in the isophotes, (c) the recently found correlation between maximum twisting and maximum flattening, (d) the presence of rotation along the minor axis. A simple geometrical model of elliptical galaxies having shells with different axial ratios c/a, b/a has been produced to interpret three fundamental key-features of elliptical galaxies: (i) the distribution of the maximum flattening observed; (ii) the percentage of ellipticals showing twisting; and (iii) the correlation between maximum twisting and maximum flattening. The model has been compared with observational data for 348 elliptical systems as given by Strom and Strom. It is found that a triaxial ellipsoid with coaxial shells having axial ratios c/a and b/a mutually dependent in a linear way can satisfy the observations.
Authors:
Benacchio, L; Galletta, G [1] 
  1. Padua Univ. (Italy). Ist. di Astronomia
Publication Date:
Dec 01, 1980
Product Type:
Journal Article
Reference Number:
AIX-12-590309; EDB-81-065219
Resource Relation:
Journal Name: Mon. Not. R. Astron. Soc.; (United Kingdom); Journal Volume: 193:3
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; GALAXIES; ELLIPTICAL CONFIGURATION; SHAPE; ANGULAR DISTRIBUTION; DISPERSION RELATIONS; ROTATION; VELOCITY; CONFIGURATION; DISTRIBUTION; MOTION; 640105* - Astrophysics & Cosmology- Galaxies
OSTI ID:
6456943
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: MNRAA
Submitting Site:
INIS
Size:
Pages: 885-894
Announcement Date:

Journal Article:

Citation Formats

Benacchio, L, and Galletta, G. Triaxiality in elliptical galaxies. United Kingdom: N. p., 1980. Web.
Benacchio, L, & Galletta, G. Triaxiality in elliptical galaxies. United Kingdom.
Benacchio, L, and Galletta, G. 1980. "Triaxiality in elliptical galaxies." United Kingdom.
@misc{etde_6456943,
title = {Triaxiality in elliptical galaxies}
author = {Benacchio, L, and Galletta, G}
abstractNote = {The existence of a triaxial shape for elliptical galaxies has been considered in recent years to explain the new kinematical and geometrical findings, i.e. (a) the low rotation/velocity dispersion ratio found also in some flat systems, (b) the presence of twisting in the isophotes, (c) the recently found correlation between maximum twisting and maximum flattening, (d) the presence of rotation along the minor axis. A simple geometrical model of elliptical galaxies having shells with different axial ratios c/a, b/a has been produced to interpret three fundamental key-features of elliptical galaxies: (i) the distribution of the maximum flattening observed; (ii) the percentage of ellipticals showing twisting; and (iii) the correlation between maximum twisting and maximum flattening. The model has been compared with observational data for 348 elliptical systems as given by Strom and Strom. It is found that a triaxial ellipsoid with coaxial shells having axial ratios c/a and b/a mutually dependent in a linear way can satisfy the observations.}
journal = {Mon. Not. R. Astron. Soc.; (United Kingdom)}
volume = {193:3}
journal type = {AC}
place = {United Kingdom}
year = {1980}
month = {Dec}
}