Made-to-measure galaxy models - II Elliptical and Lenticular Galaxies

Abstract

We take a sample of 24 elliptical and lenticular galaxies previously analysed by the SAURON project using three-integral dynamical models created with Schwarzschild's method, and re-analyse them using the made-to-measure (M2M) method of dynamical modelling. We obtain good agreement between the two methods in determining the dynamical mass-to-light (M/L) ratios for the galaxies with over 80% of ratios differing by < 10% and over 95% differing by < 20%. We show that (M/L)_M2M is approximately equal to (M/L)_Sch. For the global velocity dispersion anisotropy parameter delta, we find similar values but with fewer of the made-to-measure models tangentially anisotropic by comparison with their SAURON Schwarzschild counterparts. Our investigation is the largest comparative application of the made-to-measure method to date.

14 pages, 8 figures and 5 tables

References in corpus (9)

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• The SAURON project -- X. The orbital anisotropy of elliptical and lenticular galaxies: revisiting the (V/sigma,epsilon) diagram with integral-field stellar kinematics
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• Dark matter content and internal dynamics of NGC 4697: NMAGIC particle models from slit data and planetary nebulae velocities
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• Using NMAGIC to probe the dark matter halo and orbital structure of the X-ray bright, massive elliptical galaxy, NGC 4649

Cited by in corpus (24)

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• Made-to-measure galaxy models - III Modelling with Milky Way observations
• Evaluating the ability of triaxial Schwarzschild modelling to estimate properties of galaxies from the Illustris simulation
• A discrete chemo-dynamical model of the giant elliptical galaxy NGC 5846: dark matter fraction, internal rotation and velocity anisotropy out to six effective radii
• A Schwarzschild model of the Galactic bar with initial density from N-body simulations
• SDSS-IV MaNGA: Stellar M/L gradients and the M/L-colour relation in galaxies
• Disc galaxy modelling with a particle-by-particle M2M method
• M2M modelling of the Galactic disc via PRIMAL: Fitting to Gaia Error Added Data
• Mass density slope of elliptical galaxies from strong lensing and resolved stellar kinematics
• The Fornax3D project: Environmental effects on the assembly of dynamically cold disks in Fornax cluster galaxies
• Investigating Bar Structure of Disc Galaxies via PRIMAL: A PaRtIcle-by-particle M2M ALgorithm
• Theoretical Models of the Galactic Bulge
• Galaxy stellar and total mass estimation using machine learning
• Made-to-measure galaxy modelling utilising absorption line strength data
• Unravelling stellar populations in the Andromeda Galaxy
• Basis function expansions for galactic dynamics: Spherical versus cylindrical coordinates
• Made-To-Measure Models of Self-Similar Triaxial Halos with Steep Inner Density Gradients
• Orbit properties of massive prolate galaxies in the Illustris simulation
• Made-to-Measure Modelling of Globular Clusters
• Stellar Dynamical Modeling - Accuracy of 3D Density Estimation for Edge-on Axisymmetric Galaxies
• The validation of made-to-measure method for reconstruction of phase space distribution functions
• Stellar Dynamical Modeling -- Counting Conserved Quantities