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Date and Time of the Query: 2019-01-23 T05:08:45 PST
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For refcode 1988ApJ...334..130M:
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Copyright by American Astronomical Society. Reproduced by permission
1988ApJ...334..130M THE ROTATION CURVE OF DDO 154: A PARTICULARLY ACUTE TEST OF THE MODIFIED DYNAMICS MORDEHAI MILGROM AND EREZ BRAUN Department of Physics, Weizmann Institute of Science Received 1988 July 8; accepted 1988 July 25 ABSTRACT We compare the rotation curve of DDO 154, calculated in the framework of the modified dynamics, with the observed rotation curve reported recently by Carignan and Freeman. In this context DDO 154 stands out as a very crucial test for two reasons: (1) The accelerations measured within it are, by far, the lowest reported for any galaxy that is amenable to a rotation curve analysis. One thus works in the deep, low-acceleration limit and is free of various uncertainties that occur at higher accelerations. (2) The mass of the galaxy is dominated by the contribution of H I which is measured directly (unlike that of the stars). Using the H I mass and light distribution given by Carignan and Freeman and using their inclination and adopted distance, we get a very good agreement between the calculated and observed rotation curves, with the value of the acceleration constant a_0_ ~ 1.3 x 10^-8^ cm s^-1^, which is in agreement with earlier determinations. We also discuss some remaining uncertainties. Subject headings: galaxies: internal motions - gravitation
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