The orientation of elliptical galaxies |
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| Authors: | D K Chakraborty A K Diwakar |
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| Institution: | 1.School of Studies in Physics and Astrophysics,Pt. Ravishankar Shukla University,Raipur,India |
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| Abstract: | We determine the orientations of the light distribution of individual elliptical galaxies by combining the profiles of photometric
data from the literature with triaxial models. The orientation is given by a Bayesian probability distribution. The likelihood
of obtaining the data from a model is a function of the parameters describing the intrinsic shape and the orientation. Integrating
the likelihood over the shape parameters, we obtain the estimates of the orientation. We find that the position angle difference
between the two suitably chosen points from the profiles of the photometric data plays a key role in constraining the orientation
of the galaxy. We apply the methodology to a sample of ten galaxies. The alignment of the intrinsic principle axes of the
NGC 3379, 4486 and NGC 5638 are studied. |
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