Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mnras.190..551u&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 190, Feb. 1980, p. 551-574. Research supported by the Science Research
Astronomy and Astrophysics
Astronomy
64
Andromeda Galaxy, Hydrogen Ions, Interstellar Gas, Nebulae, Absorption Spectra, Elliptical Galaxies, Emission Spectra, Light Emission, Radial Velocity, Spatial Distribution, Spin Temperature, Star Clusters, Telescopes
Scientific paper
The paper deals with observations of neutral hydrogen in the south-west of the Andromeda Nebula (M31) at a resolution of 0.8 x 1.2 arcmin. It is shown that much of the neutral hydrogen forms long narrow arm-like segments, which are resolved by the telescope beam and are separated by several times their widths, except near the minor axis. An optical depth of 0.22 is found in the direction of the continuum source, 5C3.107, implying that the H I spin temperature is approximately 220 K. Except in a few areas where brightness temperatures exceed 60 K, self-absorption is not significant.
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