Galactic magnetism and the rotation curves of M31 and the Milky Way

Details Galactic magnetism and the rotation curves of M31 and the Milky Way Galactic magnetism and the rotation curves of M31 and the Milky Way

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...437..179v&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 437, no. 1, p. 179-183

Astronomy and Astrophysics

Astrophysics

17

Andromeda Galaxy, Astronomical Models, Dark Matter, Galactic Rotation, Gas Dynamics, Interstellar Gas, Interstellar Magnetic Fields, Milky Way Galaxy, Field Strength, Kinematics, Mathematical Models

Scientific paper

Can a magnetic field in a spiral galaxy speed up the interstellar gas in its circular galactic rotation, faster than the stars move around the galaxy? If so, a recently proposed magnetic-support model for a faster gas could explain the flat-type rotation curves of the interstellar gas moving around a galaxy's center, rendering dark matter unnecessary. But how strong must this magnetic field be? I find that in M31 and the Milky Way, the predicted magnetic field strengths (for magnetic support of the gas) are a factor more than 2 times the observational values. The predicted magnetic energies are a factor more than 4 times the observed magnetic energies. These observations contradict the magnetic-support theory of the gas, in M31 and the Milky Way.

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