sci.physics.research

On Aug 24, 9:00 am, Richard Saam wrote:
> DRLunsford wrote:
> > See this paper by Scarpa et. al.
>
> > /abs/
>
> > Quoting abstract:
>
> > "**It is shown that all clusters studied so far do behave like
> > galaxies, that is, their velocity dispersion profile flattens out at
> > large radii where the acceleration of gravity goes below 1e-8 cm/s/s,
> > instead of following the expected Keplerian fall off. In galaxies this
> > behavior is ascribed to the existence of a dark matter halo. Globular
> > clusters, however, do not contain dark matter**"
>
> How is it concluded that Globular clusters
> "do not contain dark matter"
> if they have the "dark matter" characteristic related to
> "velocity dispersion profile flattens out at large radii"?
>
> Richard Saam

Tidal streams from old clusters. Even small amounts of DM would cause
them to be gravitationally bound. Instead, they shed stars owing to
tidal interactions with the Milky Way.

/news/releases/

Also remember we are talking about EDM halos, not unaccounted-for
dwarfs etc.

-drl