Elliptical streamlines in the inner Galaxy and their large-scale organization

Details Elliptical streamlines in the inner Galaxy and their large-scale organization Elliptical streamlines in the inner Galaxy and their large-scale organization

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...276..339k&link_type=abstract

Astronomy and Astrophysics, Vol. 276, p. 339 (1993)

Astronomy and Astrophysics

Astrophysics

Galaxy: Kinematics And Dynamics, Galaxy: Structure, Ism: Kinematics And Dynamics, Radio Lines: Interstellar, Galaxy: Center

Scientific paper

Interstellar gas moving in elliptical streamlines is used to model the observed terminal velocities of neutral hydrogen gas in the I. and IV. galactic quadrant. The eccentricity of the orbits decreases with increasing distance from the galactic center r, and they are well aligned with a position angle of 35° ± 10° (as seen from the line sun-galactic center) for r ≲ 3 kpc indicating the existence of a bar in that region. Plotting the orbits in the galactic plane spiral-arm-like features are marked by orbital crowding effects. This spiral arm system is 4-armed for 3 < r <6 kpc, and two-armed outside of this and it agrees reasonably well in position with the spiral structure outlined by Georgelin & Georgelin (1976).
The strong peak of the galactic rotation curve found amongst others by Rohlfs & Kreitschmann (1987) near r = 500 pc is seen to be caused by the geometry of the elliptical orbits and not to be a feature of the dynamics. For the orbital velocity of the gas in the apogalactic position a value of about 200 km s-1 is found that varies remarkably little with the galactic radius.
From the calculated velocity field it is possible to compute model line-profiles which can reproduce some of the features of the measured profile better than models with circular geometry do.

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