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An Entity of Type : prov:Entity, within Data Space : webisa.webdatacommons.org associated with source dataset(s)

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  • A Mestel disc galaxy with surface density S given by S=k/R (1) where R is the radius and k is a constant, makes radial gravitation g given by g=2 pi Gk/R (2).For circular motion V^2/R=g whence using (2) then V^2=2 pi Gk (3) giving a constant V, ie. a flat rotation curve (eg. see Binney & Tremain, ???Galactic Dynamics???, PUP, 2008, p.329).
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