Simulations of the galaxy cluster “El Gordo” suggest that dark matter may be self-interacting, supporting the Self-Interacting Dark Matter model over the standard collisionless dark matter model. Credit: SciTechDaily.com
This research makes an important contribution in favor of the SIDM model, according to which dark matter particles exchange energy through collisions, with interesting astrophysical repercussions. Proving the collisional properties of dark matter and, more generally, alternative theories to the standard cosmological model one is very complicated: “There are, however, unique laboratories that can prove very useful for this purpose, many light years away from us. These are the massive galaxy clusters, gigantic cosmic structures that, upon collision, determine the most energetic events since thesolar masses, El Gordo is one of the largest galaxy clusters we know.
“Moreover, the Brightest Cluster Galaxy is not only trailing the X-ray peak, but it also appears to be spatially offset from the SE mass centroid. Another notable aspect can be seen in the NW cluster, where the galaxy number density peak is spatially offset from the corresponding mass peak.”
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