Two and Three Dimensional Shape Distribution of Elliptical Galaxy NGC 315 Using Photometry
Author(s):
Dr. Arun Kumar Singh
Keywords:
The three dimensional shapes of the light distribution of elliptical galaxies can be determined by addng the photometric data profiles which is taken from the literature. We have used triaxial models which is sum of different models. In this paper, ensembles of models are used to make the shape estimates model independent. The methodology used was as described in Statler (1994), Chakraborty et al. (2008), Chakraborty et al. (2011), Singh (2011), Singh (2015) and Singh (2019) using flat prior and Singh & Diwakar (2020). In this paper a modified prior is applied to determine the shape of NGC 315. This paper shows that how the parameters get constrained at short to long axial ratios at very small and at very large radii, and the absolute value of the triaxiality difference are well constrained shape parameters. The three dimensional shape of elliptical galaxy NGC 315 is determined using a flat prior. The above three dimensional shape distribution can also be determined using modified prio
Abstract
The three dimensional shapes of the light distribution of elliptical galaxies can be determined by addng the photometric data profiles which is taken from the literature. We have used triaxial models which is sum of different models. In this paper, ensembles of models are used to make the shape estimates model independent. The methodology used was as described in Statler (1994), Chakraborty et al. (2008), Chakraborty et al. (2011), Singh (2011), Singh (2015) and Singh (2019) using flat prior and Singh & Diwakar (2020). In this paper a modified prior is applied to determine the shape of NGC 315. This paper shows that how the parameters get constrained at short to long axial ratios at very small and at very large radii, and the absolute value of the triaxiality difference are well constrained shape parameters. The three dimensional shape of elliptical galaxy NGC 315 is determined using a flat prior. The above three dimensional shape distribution can also be determined using modified prior. These results are compared with the previous estimates which are determined by using flat prior. The plot shows the intrinsic shapes distribution of the NGC 315 as a function of (q0,q∞,|Td|) for three dimensional shapes, where q0 and q∞ are the short to long axial ratios at small and at very large radii and |Td| is the absolute values of the triaxiality difference, defined as |Td| = |T∞-T0 |. The probability is shown by the plot of dark grey region; darker is the region it means that higher is the probability.
Article Details
Unique Paper ID: 153324

Publication Volume & Issue: Volume 8, Issue 6

Page(s): 432 - 435
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