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Open Astronomy

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Volume 26, Issue 1

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Parameters of Six Selected Galactic Potential Models

Anisa Bajkova / Vadim Bobylev
Published Online: 2017-11-09 | DOI: https://doi.org/10.1515/astro-2017-0016

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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-Santillán (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 p⊙ - 0.1M⊙ pc−3 and the vertical force |Kz=1.1|/2πG = 77M⊙ 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.

Keywords: Galaxy: kinematics and dynamics; structure

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About the article

Received: 2017-08-22

Accepted: 2017-09-25

Published Online: 2017-11-09

Published in Print: 2017-11-27

Citation Information: Open Astronomy, Volume 26, Issue 1, Pages 72–79, ISSN (Online) 2543-6376, DOI: https://doi.org/10.1515/astro-2017-0016.

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© 2017. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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[1]
V. V. Bobylev and A. T. Bajkova
Astronomy Reports, 2018, Volume 62, Number 9, Page 557

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