High Resolution Observations of Neutral Hydrogen in M31 - I.: THE OVERALL DISTRIBUTION
Open Access
- 1 December 1974
- journal article
- research article
- Published by Oxford University Press (OUP) in Monthly Notices of the Royal Astronomical Society
- Vol. 169 (3) , 607-629
- https://doi.org/10.1093/mnras/169.3.607
Abstract
Observations of the galaxy M31 at 21 cm wavelength have been made with the Cambridge Half-Mile telescope, enabling the neutral hydrogen to be mapped with an angular resolution of 1′.5 × 2′.2 and a velocity resolution of 39 km s−1. The central deficiency of H I is found to extend to 4 kpc from the nucleus but beyond that distance the H I emission is seen to be strongly associated with dust lanes. The surface densities of H II regions and the youngest OB associations are found to vary approximately as the square of the H I surface density. H I emission along the major axis has been detected to 162′ (32.4 kpc) SW from the nucleus, and to 120′ (24 kpc) NE.Keywords
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