Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.251..551g&link_type=abstract
In ESA Proceedings of the Joint Varenna-Abastumani International School and Workshop on Plasma Astrophysics p 551-556 (SEE N87-
Astronomy and Astrophysics
Astrophysics
2
Astronomical Models, Disk Galaxies, Gas Flow, Intergalactic Media, Milky Way Galaxy, Rotating Fluids, Oblate Spheroids, Parameter Identification, Pressure Gradients, Spiral Galaxies
Scientific paper
The galactic disk is modeled by an oblate spheroid with cofocal isodensity surfaces. An explicit analytical expression is found for the angular velocity of the gas outside the disk. Parameters of a three-component mass model of a spiral galaxy are adjusted to give a double-peaked rotation curve (as in the M31 and M81 Galaxies) in a disk. It is shown that the halo gas corotates with the disk at moderate heights, z less than or = 2 kpc. However, farther above the disk the doublepeaked form is washed out. Gas pressure gradient in the halo only weakly changes the rotation curve just above the disk (r less than r disk) and causes the decrease of the rotational velocity beyond the disk edge (r greater than r disk).
Gvaramadze Vasilii V.
Lominadze Jumber G.
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