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The SAMI Galaxy Survey: The internal orbital structure and mass distribution of passive galaxies from triaxial orbit-superposition Schwarzschild models by Santucci, Giulia; Brough, Sarah; van de Sande, Jesse; McDermid, Richard M.; van de Ven, Glenn; Zhu, Ling; D'Eugenio, Francesco; Bland-Hawthorn, Joss; Barsanti, Stefania; Bryant, Julia J.; Croom, Scott M.; Davies, Roger L.; Green, Andrew W.; Lawrence, Jon S.; Lorente, Nuria P. F.; Owers, Matt S.; Poci, Adriano; Richards, Samuel N.; Thater, Sabine; Yi, Sukyoung is a scholarly article available to read on EtoBox.

What is The SAMI Galaxy Survey: The internal orbital structure and mass distribution of passive galaxies from triaxial orbit-superposition Schwarzschild models about?

Dynamical models are crucial for uncovering the internal dynamics of galaxies, however, most of the results to date assume axisymmetry, which is not representative for a significant fraction of massive galaxies. Here, we build triaxial Schwarschild orbit-superposition models of galaxies taken from the SAMI Galaxy Survey, in order to reconstruct their inner orbital structure and mass distribution. The sample consists of 161 passive galaxies with total stellar masses in the range $10^{9.5}$ to $10^{12} M_{\odot}$. We find that the changes in internal structures within 1$R_{\rm e}$ are correlated with the total stellar mass of the individual galaxies. The majority of the galaxies in the sample ($73\% \pm 3\%$) are oblate, while $19\% \pm 3\%$ are mildly triaxial and $8\% \pm 2\%$ have triaxial/prolate shape. Galaxies with $\log M_{\star}/M_{\odot} > 10.50$ are more likely to be non-oblate. We find a mean dark matter fraction of $f_{\rm{DM}} = 0.28 \pm 0.20$, within 1$R_{\rm e}$. Galaxies with higher intrinsic ellipticity (flatter) are found to have more negative velocity anisotropy $\beta_r$ (tangential anisotropy). $\beta_r$ also shows an anti-correlation with the edge-on spin parame

Author

Santucci, Giulia; Brough, Sarah; van de Sande, Jesse; McDermid, Richard M.; van de Ven, Glenn; Zhu, Ling; D'Eugenio, Francesco; Bland-Hawthorn, Joss; Barsanti, Stefania; Bryant, Julia J.; Croom, Scott M.; Davies, Roger L.; Green, Andrew W.; Lawrence, Jon S.; Lorente, Nuria P. F.; Owers, Matt S.; Poci, Adriano; Richards, Samuel N.; Thater, Sabine; Yi, Sukyoung

Published

2022

Language

EN