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 Rudolf</i>
<br />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?<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

I'm working on that, and just received a contributed paper that might have the answer. If so, watch for the article soon in the MRB. The paper is out for review now, and it would be premature to comment just yet. -|Tom|-

Thanks, I'm sure there is a 'simple' explanation or the 'data' is not perfect. I find it hard to believe that gravity would behave differently in ellipticals that from other galaxies. It must be an additional effect or the lack of something - perhaps a lower density of stars or so.

Rudolf

I've been reading up on galaxy forms and from what I've learned ellipticals have very little gas and dust. This seems to indicate lower mass per area or density and can mean fewer graviton scattering. Thus the influence of gravity could be 'bigger' somehow.

Just an idea.

Rudolf

Rudolf,

<blockquote id="quote"><font size="2" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><b>I find it hard to believe that gravity would behave differently in ellipticals that from other galaxies. It must be an additional effect or the lack of something - perhaps a lower density of stars or so.</b><hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

Are you talking about MOND?


Knowing to believe only half of what you hear is a sign of intelligence. Knowing which half to believe can make you a genius.

Sorry, I'm not so well versed in physics/astronomy and have only seen some people use the term MOND here. I do not know what it stands for or that it is use for. If you don't mind can you please explain it (sorry but this is probably going of the topic then)?

But on the galaxy and dark matter topic, I came accros a web site with a java applet that let you view galaxy collisions. I assume the simulations are still based on having dark matter included but it makes for wonderfull viewing.

burro.astr.cwru.edu/JavaLab/GalCrashWeb/

Interestingly, some of the collisions turn out to look like spirals!

Rudolf

Rudolf,

Here is a link to MOND. Do a google search and will will find a lot of information but it is "MOdified Newtonian Dynamics". It holds that the inverse square law has a range limit and that gravity becomes more flat, etc.

It mitigates if not eliminates the need for Dark Energy.

en2.wikipedia.org/wiki/Modified_Newtonian_Dynamics

Knowing to believe only half of what you hear is a sign of intelligence. Knowing which half to believe can make you a genius.