A Galactic Bore: The Vertical Structure of Gas Associated to a Spiral Arm

Details A Galactic Bore: The Vertical Structure of Gas Associated to a Spiral Arm A Galactic Bore: The Vertical Structure of Gas Associated to a Spiral Arm

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.4311m&link_type=abstract

American Astronomical Society, 188th AAS Meeting, #43.11; Bulletin of the American Astronomical Society, Vol. 28, p.890

Astronomy and Astrophysics

Astronomy

2

Scientific paper

A spiral arm is modeled as a superposition of prolate spheroids. An explicit expression is given for the resultant gravitational potential of the arm. Functional forms are also proposed for the vertical gravitational acceleration produced by the stars in the galactic disk, and the density laws for the gas components of the thick galactic disk in the vertical direction. Starting from hydrostatic equilibrium, the gas response to the spiral density wave is studied via numerical simulations of the local gas flow. The galactic magnetic field is included in different geometries. Interesting flow patterns high above from the galactic midplane are found. The transition nearly resembles the hydraulic jump, or bore, from the incompressible flow theory.

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