Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26as...49..745b&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 49, Sept. 1982, p. 745-774.
Astronomy and Astrophysics
Astrophysics
23
Andromeda Galaxy, Astronomical Maps, Galactic Structure, H Lines, High Resolution, Neutral Gases, Galactic Rotation, Molecular Clouds, Radio Telescopes
Scientific paper
High-resolution (24 x 37 arcsec) observations of the central part of M31 in the 21-cm line of H I are described. The results are presented as contour maps at constant velocity and as position-velocity contour maps on a rectangular grid. Published parameters are used to construct a kinematic model for comparison with the observed data. The observed H I is attributed to two separate structures, one lying in the outer part of the disk and seen in projection against the central region as a consequence of a warp, and the other lying in the central part of the disk. This latter component is strongly concentrated in spiral arms and shows pronounced local deviations from circular motion. Arm 3 on the west side is strongly reminiscent of the 3-kpc arm in the Galaxy.
Bajaja Esteban
Shane William Whitney
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