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Title:
Models for the inner regions of the Galaxy. I
Authors:
Peters, W. L., III
Affiliation:
AA(Texas, University, Austin, Tex.)
Publication:
Astrophysical Journal, vol. 195, Feb. 1, 1975, pt. 1, p. 617-629. (ApJ Homepage)
Publication Date:
02/1975
Category:
Astrophysics
Origin:
STI
NASA/STI 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
DOI:
10.1086/153363
Bibliographic Code:
1975ApJ...195..617P

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.

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