Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218...86b&link_type=abstract
Astrophysical Journal, Part 1, vol. 218, Nov. 15, 1977, p. 86-91.
Astronomy and Astrophysics
Astrophysics
19
Andromeda Galaxy, Galactic Structure, Gas Dynamics, Gravitational Effects, Astronomical Models, Computerized Simulation, Disks (Shapes), Hydrogen, Radial Velocity
Scientific paper
Earlier work has shown by computer simulation that the gravity of M32, the companion galaxy which orbits M31, can produce asymmetries in the radial-velocity pattern of the projected disk of M31 similar to those observed at 21 cm wavelengths. The same orbit also ejects a sheet of material far enough from the plane to produce multiple-valued H I radial velocities over areas where both sheet and disk are superposed. The present investigation is a detailed study of the sheet generated by computer simulation. Reasonable agreement can be obtained between the simulated sheet radial-velocity pattern and 21 cm observations over part of the disk of multiple-valued velocities by Roberts and Whitehurst. The model is used to predict the multiple velocity patterns over the rest of M31's disk. The computer model sheet material is thrown over 10 kpc from M31's disk in a complex shape.
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