[FRIAM] new studies confirm existence galaxies almost-no-dark-matter

[Eric Smith]

This is really nice, Glen, and not one I had seen.

Many thanks,

Eric

> On Apr 2, 2019, at 8:20 AM, uǝlƃ ☣ <gepropella at gmail.com> wrote:
> 
> I second the thanks, Eric!  Your "stripped via collision" lead me to Google.  I try to follow Ethan Siegel, but totally missed this post from last year:
> 
> https://medium.com/starts-with-a-bang/5-ways-to-make-a-galaxy-with-no-dark-matter-7ed6fe6c9889
> 
>> On Mon, Apr 1, 2019 at 3:14 AM Eric Smith <desmith at santafe.edu <mailto:desmith at santafe.edu>> wrote:
>> 
>>    In a way, this result is the one that could have been expected.  There are now lots of images from gravitational lensing that show “clouds” of DM off-center from galaxies that we can see in the visible.  This especially happens when galaxies collide.  So DM was behaving like matter already, and it is not very surprising to see that maybe it could be all-but-stripped from a galaxy, leaving only a scattering of visible matter.  It would not surprise me if at some point somebody can show that it was a long-ago collision that did this stripping, and much later the diffuse ball of stars re-settled to an ellipsoid. 
> 
> -- 
> ☣ uǝlƃ
> 
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