Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...208...52d&link_type=abstract
Astrophysical Journal, vol. 208, Aug. 15, 1976, pt. 1, p. 52-63.
Astronomy and Astrophysics
Astrophysics
7
Astronomical Models, Dynamic Response, Explosions, Galactic Nuclei, Interstellar Matter, Shock Fronts, Galactic Structure, Shock Waves, Velocity Distribution
Scientific paper
The behavior of an inviscid interstellar medium following an isotropic explosion at the galactic center is studied numerically in a model where the angular momentum of each element of fluid is conserved, and gas eventually falls back to the nuclear region. The question is whether this gas adopts the form of the observed nuclear disk and whether such a disk can be expected to exist simultaneously with a 3-kpc arm. A Lagrangian approach was taken in the geometry of an infinitely long cylinder rotating about its axis. A constant circular velocity independent of distance from the center is assumed. An explosion is simulated by increasing the magnetic field in the innermost zone by an amount depending exponentially on time. The model reproduces some of the features of the central region of the Galaxy. Attention is given to the 21 cm emission feature.
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