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Models for the inner regions of the Galaxy. I. An elliptical streamline model.

Abstract

A new model is proposed for the inner regions of the Galaxy. This model involves gas flowing along concentric elliptical streamlines such as might be caused by a barlike perturbation in the gravitation field of the inner regions of the Galaxy. It is found that such a model can produce not only the so-called 3 kpc arm and the 135 km per sec arm features, but other high-velocity features as well. This model does not require a highly energetic explosion at the galactic nucleus as does the usual expanding spiral-arm model, because there is no net flow of matter out of the inner regions. This model suggests that the outer spiral-arm density wave might be associated with a barlike density wave in the inner regions of the Galaxy.


Publication:
The Astrophysical Journal
Pub Date:
February 1975
DOI:

10.1086/153363

Bibcode:
1975ApJ...195..617P
Keywords:
  • Astronomical Models;
  • Galactic Nuclei;
  • Galactic Structure;
  • Gas Flow;
  • Microwave Emission;
  • Milky Way Galaxy;
  • Density Distribution;
  • Elliptical Orbits;
  • Flow Geometry;
  • Gravitational Effects;
  • Line Spectra;
  • Radio Astronomy;
  • Velocity Distribution;
  • Astrophysics
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