Radio Data Relevant to the Choice of a Galactic Coordinate System
Open Access
- 1 August 1960
- journal article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 121 (2) , 150-163
- https://doi.org/10.1093/mnras/121.2.150
Abstract
Radio observations relating to the determination of the directions towards the galactic pole and centre are collected and studied. The most important evidence on the direction of the pole is based on 21-cm hydrogen line observations; the derived direction is confirmed by observations in the radio continuum. The direction towards the galactic centre is deduced from various continuum and hydrogen line observations, the most precise information being derived from the position of the radio source Sagittarius A which is assumed to be associated with the galactic nucleus and at the galactic centre. The outstanding physical result of this study is the extreme flatness of the disk of neutral hydrogen in its central parts; a new point is the large-scale association between the sources of the radio continuum and the 21-cm line radiation. The significance of the results is discussed.Keywords
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