Galactic Dark Matter Distribution

<blockquote id="quote"><font size="2" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Mac</i>
<br />Yes thanks. Has anyone tried to correlate that to the MOND range for inverse square gravity?<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

The two models have been compared qualitatively but not quantitatively. An approximate MOND theory can be derived from the finite-range-of-gravity idea, which gives MOND a physical basis.

You are right that the MOND minimum acceleration parameter probably tells us something important about gravitons. That implication has not yet been worked out. -|Tom|-

Perhaps a dumb question but does the observed star motions [inverse linear ] also apply to other types of galaxies? It seems to me that the majority of observations indicates a inverse linear acceleration curve (from what I have read) but does this apply to say irregular shaped galaxies?

Rudolf

<blockquote id="quote"><font size="2" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Rudolf</i>
<br />does the observed star motions [inverse linear] also apply to other types of galaxies? It seems to me that the majority of observations indicates a inverse linear acceleration curve (from what I have read) but does this apply to say irregular shaped galaxies?<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

Ellipticals and irregulars have disturbed velocity curves. According to theory, this is because of recent mergers with neighboring galaxies. -|Tom|-

Sorry but another 'dumb question' , what do you mean by 'disturbed velocity curves'? Do you imply multiple velocities (curves) or more random kind? Obviously for irregulars speaking of 'curves' like in graph curves is a bit out - lack of definite structure due to destructive events working, but how does that work for ellipticals? Also, is there 'different' curves for different size ellipticals? If Gravity is the classical infinite force it (curve) should be (roughly) the same for any size but not for finite gravity - IMHO.

Rudolf

<blockquote id="quote"><font size="2" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Rudolf</i>
<br />how does that work for ellipticals?<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

Ellipticals have not been extensively studied. But a recent survey of a small number of them found that they "seemed devoid of dark matter". which means the velocity curves must drop off in a more traditionally expected way. The authors attributed the loss of most dark matter to collisions with other galaxies. -|Tom|-

If you say their velocity show a more traditional curve that would seems to imply that a model like meta model does not describe gravity correctly (for this case). How would the meta model explain this provided the 'data' is right?

Rudolf