Neutral hydrogen in the outer regions of M31

Details Neutral hydrogen in the outer regions of M31 Neutral hydrogen in the outer regions of M31

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.181..573n&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 181, Dec. 1977, p. 573-590. Research supported by the Science Research

Astronomy and Astrophysics

Astronomy

79

Andromeda Galaxy, Astronomical Maps, Galactic Structure, Hydrogen Clouds, Neutral Gases, Data Reduction, Flow Velocity, Galactic Nuclei, Gas Density, Radial Velocity, Velocity Distribution

Scientific paper

Aperture-synthesis observations of neutral hydrogen in the extreme northeast and southwest (NE and SW) regions of M31, with a beam of 3.6 x 5.5 arcmin and a resolution in radial velocity of 16 km/s, are described. In the SW, the H I plane is warped away from the major axis and is detectable to a distance of 30 kpc from the nucleus, in good agreement with previous observations. To the NE, the H I is also found to be displaced from the major axis at distances of up to 30.5 kpc from the nucleus. A simple model for the distribution of H I gives a velocity field close to that observed. An H I cloud with anomalous velocity has been found to the NE of M31 at an angular distance of 150 arcmin from the nucleus.

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