Talk:Abell 520

'Dark Core' Disappears...
This puzzle seems to have been solved by new observations using a new Hubble camera and additional analysis that did not find any anomalous region containing dark matter but no luminous galaxies.

Jtdwyer (talk) 03:40, 21 January 2013 (UTC)

"'Dark core' may not be so dark after all," http://www.eurekalert.org/pub_releases/2012-11/ou-cm112912.php#.

The draft copy of the research report (published in ApJ) is freely available" Clowe, et al., (2012), "On Dark Peaks and Missing Mass: A Weak Lensing Mass Reconstruction of the Merging Cluster System Abell 520", http://arxiv.org/abs/1209.2143.