High resolution observations of dark matter?

[Martin Sallberg]

Are there any high resolution observations of the gravitational lensing by dark matter, good enough to determine if dark matter is clumped or spread out at small scales?

 

[marcus]

Hard to know what you have in mind by "small scales". Density maps of DM that I've seen show variations on scales larger than the size of a galaxy.

 

[Joe Ciancimino]

I saw something on this in a recent documentary and I managed to find the photo they had shown.

Image: Composite Credit: X-ray: NASA/CXC/CfA/ M.Markevitch et al.;
Lensing Map: NASA/STScI; ESO WFI; Magellan/U.Arizona/ D.Clowe et al.
Optical: NASA/STScI; Magellan/U.Arizona/D.Clowe et al.
http://www.roe.ac.uk/~heymans/website_images/bulletcluster_comp_f2048.jpg

Found on:
http://www.cfhtlens.org/public/what-gravitational-lensing

The argument was that according to the calculated mass of the galaxy cluster, the gravitation lensing should be in the center but instead is shown on either side. Not exactly what you are looking for but the closest they have come so far to my knowledge.