Refinement of Parameters of Six Selected Galactic Potential Models

TL;DR

This study refines parameters of six Galactic potential models using modern velocity data up to 200 kpc, providing updated estimates of Galactic characteristics and comparing model performances.

Contribution

It introduces refined parameters for six axisymmetric Galactic potential models based on recent data, enhancing the accuracy of Galactic mass distribution representations.

Findings

Refined parameters for six Galactic potential models.

Comparison of model fits to observational data.

Updated estimates of Galactic characteristics.

Abstract

This paper is devoted to the refinement of the parameters of the six three-component (bulge, disk, halo) axisymmetric Galactic gravitational potential models on the basis of modern data on circular velocities of Galactic objects located at distances up to 200 kpc from the Galactic center. In all models the bulge and disk are described by the Miyamoto--Nagai expressions. To describe the halo, the models of Allen-Santill\'an (I), Wilkinson-Evans (II), Navarro-Frenk-White (III), Binney (IV), Plummer (V), and Hernquist (VI) are used. The sought-for parameters of potential models are determined by fitting the model rotation curves to the measured velocities, taking into account restrictions on the local dynamical matter density $\rho_\odot=0.1 M_\odot$ pc$^{-3}$ and the vertical force $|K_{z=1.1}|/2\pi G=77 M_\odot $ pc$^{-2}$. A comparative analysis of the refined potential models is made and for each of the models the estimates of a number of the Galactic characteristics are presented.