Dynamical modelling of the elliptical galaxy NGC 2974

Abstract

In this paper we analyse the relations between a previously described oblate Jaffe model for an ellipsoidal galaxy and the observed quantities for NGC 2974, and obtain the length and velocity scales for a relevant elliptical galaxy model. We then derive the finite total mass of the model from these scales, and finally find a good fit of an isotropic oblate Jaffe model by using the Gauss-Hermite fit parameters and the observed ellipticity of the galaxy NGC 2974. The model is also used to predict the total luminous mass of NGC 2974, assuming that the influence of dark matter in this galaxy on the image, ellipticity and Gauss-Hermite fit parameters of this galaxy is negligible within the central region, of radius $0.5R_{\mathrm{e}}.$

7 figures

References in corpus (18)

• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Preliminary Maps and Basic Results
• Parametric Recovery of Line-of-Sight Velocity Distributions from Absorption-Line Spectra of Galaxies via Penalized Likelihood
• The Microwave Anisotropy Probe (MAP) Mission
• A Family of Models for Spherical Stellar Systems
• Dynamical modelling of luminous and dark matter in 17 Coma early-type galaxies
• The orbital structure and potential of NGC 1399
• Dynamical modelling of stars and gas in NGC2974: determination of mass-to-light ratio, inclination and orbital structure by Schwarzschild's method
• The shape of the dark matter halo in the early-type galaxy NGC 2974
• Axisymmetric galaxy models wth central BHs, with an application to M32
• Line-of-sight velocity distributions of low-luminosity elliptical galaxies
• A two-arm gaseous spiral in the inner 200 pc of the early-type galaxy NGC 2974: signature of an inner bar
• The dynamical structure of isotropic spherical galaxies with a central black hole
• A completely analytical family of dynamical models for spherical galaxies and bulges with a central black hole
• Two-integral distribution functions for axisymmetric systems
• Anisotropic distribution functions for spherical galaxies
• Two-integral distribution functions for axisymmetric stellar systems with separable densities
• Axisymmetric models for galaxies by equipotential and equidensity methods
• Dynamical analysis of elliptical galaxy halos