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For refcode 1998ApJ...508..132D:
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Copyright by American Astronomical Society. Reproduced by permission
1998ApJ...508..132D Testing Modified Newtonian Dynamics with Low Surface Brightness Galaxies: Rotation Curve Fits W. J. G. DE BLOK Kapteyn Astronomical Institute, P.O. Box 800, 9700 AV Groningen, The Netherlands AND S. S. MCGAUGH Department of Terrestrial Magnetism, Carnegie Institution of Washington, 5241 Broad Branch Road NW, Washington, DC 20015 Received 1998 February 24; accepted 1998 May 19 ABSTRACT We present modified Newtonian dynamics (MOND) fits to 15 rotation curves of low surface brightness (LSB) galaxies. Good fits are readily found, although for a few galaxies minor adjustments to the inclination are needed. Reasonable values for the stellar mass-to-light ratios are found, as well as an approximately constant value for the total (gas and stars) mass-to-light ratio. We show that the LSB galaxies investigated here lie on the one, unique Tully-Fisher relation, as predicted by MOND. The scatter on the Tully-Fisher relation can be completely explained by the observed scatter in the total mass-to-light ratio. We address the question of whether MOND can fit any arbitrary rotation curve by constructing a plausible fake model galaxy. While MOND is unable to fit this hypothetical galaxy, a normal dark-halo fit is readily found, showing that dark matter fits are much less selective in producing fits. The good fits to rotation curves of LSB galaxies support MOND, especially because these are galaxies with large mass discrepancies deep in the MOND regime. Subject headings: dark matter-galaxies: fundamental parameters -galaxies: halos-galaxies: kinematics and dynamics-galaxies: spiral-gravitation
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