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1976•Publications of the Astronomical Society of the PacificOpen access

A model for the local spiral structure of the Galaxy

R. M. Humphreys

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Abstract

Spatial distributions of optical spiral tracers and their motions in the region of the galactic plane from 1 = 280 to 340 deg are studied. When this region is related to the entire pattern of local spiral structure a major spiral arm, Sagittarius-Carina, is revealed from 1 = 280 to 30 deg. A model of the optical spiral pattern is proposed which adequately describes the available spatial and kinematic information for the spiral tracers.

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Spatial distributions of optical spiral tracers and their motions in the region of the galactic plane from 1 = 280 to 340 deg are studied. When this region is related to the entire pattern of local spiral structure a major spiral arm, Sagittarius-Carina, is revealed from 1 = 280 to 30 deg. A model of the optical spiral pattern is proposed which adequately describes the available spatial and kinematic information for the spiral tracers.

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Available abstract

Spatial distributions of optical spiral tracers and their motions in the region of the galactic plane from 1 = 280 to 340 deg are studied. When this region is related to the entire pattern of local spiral structure a major spiral arm, Sagittarius-Carina, is revealed from 1 = 280 to 30 deg. A model of the optical spiral pattern is proposed which adequately describes the available spatial and kinematic information for the spiral tracers.

Key concepts: Spiral (railway), Spiral galaxy, Physics, Irregular galaxy, Barred spiral galaxy, Astrophysics, Galactic plane, Kinematics

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