Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.178..577c&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 178, Mar. 1977, p. 577-589.
Astronomy and Astrophysics
Astronomy
101
Astronomical Maps, Galactic Structure, Hydrogen Clouds, Interacting Galaxies, Mass Distribution, Radial Velocity, H Alpha Line, High Resolution, Hydrogen Atoms, Neutral Particles, Velocity Distribution
Scientific paper
The neutral hydrogen distribution and velocity field in the region surrounding M81 and its peculiar companion M82 are mapped at resolutions of 4 and 2 arcmin. It is found that the H I surface density of M82 tends to diminish along the northern minor axis of the galaxy, coinciding with the eastern half of a northern bundle of filaments, and that the H I surrounding the filaments has a radial-velocity gradient in the same sense but of a different magnitude as that in the filaments themselves. These observations are used to argue that M82 interacted tidally with the northern portion of M81 about 180 million years ago and that the gas seen above and below the disk of M82 may have been captured from the outer parts of M81. A filament model is discussed which can explain observations of a blueshifted H-alpha line on the south side of M82.
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