SDSS-IV MaNGA: Internal mass distributions and orbital structures of early-type galaxies and their dependence on environment

Abstract

In our earlier 2019 paper, we evaluated the reliability of Schwarzschild's orbit-superposition dynamical modelling method in estimating the internal mass distribution, intrinsic stellar shapes and orbit distributions of early-type galaxies (ETGs) taken from the Illustris cosmological simulation. We now apply the same techniques to galaxies taken from the integral-field survey Mapping Nearby Galaxies with APO (MaNGA), using a sample of 149 ETGs in the mass range of $10^{9.90}\sim 10^{11.80}{M}_{\odot }$ and made up of 105 central and 44 satellite galaxies. We find that low-mass ETGs with $\log (M_{\ast }/M_{\odot })<11.1$ have an average dark matter fraction of $\sim 0.2$ within one effective radius $R_{\mathrm{e}}$, tend to be oblate-like, and are dominated by rotation about their minor axis. High-mass ETGs with $\log (M_{\ast }/M_{\odot })>11.1$ have an average dark matter fraction of $\sim 0.4$ within one effective radius $R_{\mathrm{e}}$, tend to be prolate-like, and are dominated by rotation about their major axis and by centrophilic orbits. The changes of internal structures within one $R_{\mathrm{e}}$ are dominated by the total stellar mass of the individual galaxies. We find no differences of internal structures between central and satellite ETGs for the same stellar masses. However, for similar stellar mass and colour distributions, we find that ETGs more prolate-like, or with more hot orbits, tend to have higher close neighbour counts at $r_p\sim 40$ kpc.

19 pages, 18 figures

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• Keck Integral-Field Spectroscopy of M87 Reveals an Intrinsically Triaxial Galaxy and a Revised Black Hole Mass
• A novel approach to optimize the regularization and evaluation of dynamical models using a model selection framework
• Triaxial Orbit-based Dynamical Modeling of Galaxies with Supermassive Black Holes and an Application to Massive Elliptical Galaxy NGC 1453
• Shapes of Milky-Way-Mass Galaxies with Self-Interacting Dark Matter
• The SAMI Galaxy Survey: Environmental analysis of the orbital structures of passive galaxies
• Orbit-Superposition Dynamical Modeling of Barred Galaxies
• RABBITS -- II. The impact of AGN feedback on coalescing supermassive black holes in disc and elliptical galaxy mergers
• Comparing Lensing and Stellar Orbital Models of a Nearby Massive Strong-Lens Galaxy
• Decomposing galaxies with BANG: an automated morpho-kinematical decomposition of the SDSS-DR17 MaNGA survey
• New Analysis of Dark Matter in Elliptical Galaxies
• Stellar Dynamical Modeling - Accuracy of 3D Density Estimation for Edge-on Axisymmetric Galaxies