Construction of a global gas-dynamical model for our galaxy

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Astronomical Models, Galactic Structure, Gas Dynamics, Milky Way Galaxy, Barred Galaxies, Euler Equations Of Motion, Hydrogen, Radial Velocity

Scientific paper

An attempt is made to construct a global gas-dynamical model of Earth's Galaxy using a two-dimensional quasi-steady solution of the gas-dynamical equations in the gravitational potential of a weakly barred galaxy. From this solution longitude-velocity (1,v) diagrams are constructed and compared with observations of neutral hydrogen in the Galaxy. A position was determined for the sun, which for the present model, correctly reproduces the 3-kpc arm, the high velocities near the center and the anticenter, and some other distinct features in the observations. It is shown that the (l,v) diagram is determined mainly by the non-circular velocity field of the numerical solution used, implying that the interpretation of the observed (l,v) distribution in terms of high-density arms and circular motion may lead to incorrect results. The rotation curve corresponding to the axisymmetric part of the potential is proportional to R exp 0.1 (R is a galactocentric coordinate). The bar generates large deviations from this rotation curve. The model (1,v)-diagram has high velocity wings near the center. This indicates that the central peak in the observed galactic rotation curve is attributed to highly non-circular motions. In effect, the interpretation of this peak in terms of circular motion will overestimate the mass of the central stellar component.

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