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1981•Monthly Notices of the Royal Astronomical SocietyOpen access

A simple model of the Galaxy

W. L. H. Shuter

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Abstract

Published 21 cm and CO data have been reanalysed and indicate that the rotation curve of the Galaxy is essentially flat from within 1 kpc of the Galactic Centre to the limit of the 21 cm disc at ∼ 15.5 kpc from the centre. The velocity of rotation is 184 ± 9 km s−1. Mestel has shown that a rotation curve of this type can be produced by a mass distribution in the form of a thin disc with mass density per unit area roughly proportional to the reciprocal of the distance from the Galactic Centre. Predictions of the resulting model are compared with observations.

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What this paper is about

Published 21 cm and CO data have been reanalysed and indicate that the rotation curve of the Galaxy is essentially flat from within 1 kpc of the Galactic Centre to the limit of the 21 cm disc at ∼ 15.5 kpc from the centre. The velocity of rotation is 184 ± 9 km s−1. Mestel has shown that a rotation curve of this type can be produced by a mass distribution in the form of a thin disc with mass density per unit area roughly proportional to the reciprocal of the distance from the Galactic Centre. Predictions of the resulting model are compared with observations.

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Available abstract

Published 21 cm and CO data have been reanalysed and indicate that the rotation curve of the Galaxy is essentially flat from within 1 kpc of the Galactic Centre to the limit of the 21 cm disc at ∼ 15.5 kpc from the centre. The velocity of rotation is 184 ± 9 km s−1. Mestel has shown that a rotation curve of this type can be produced by a mass distribution in the form of a thin disc with mass density per unit area roughly proportional to the reciprocal of the distance from the Galactic Centre. Predictions of the resulting model are compared with observations.

Key concepts: Physics, Galaxy rotation curve, Galaxy, Astrophysics, Rotation (mathematics), Mass distribution, Astronomy, Galaxy formation and evolution

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