Galaxy cluster bulk flows and collision velocities in qumond

Harley Katz, Stacy McGaugh, Peter Teuben, G. W. Angus

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


We examine the formation of clusters of galaxies in numerical simulations of a QUMOND cosmogony with massive sterile neutrinos. Clusters formed in these exploratory simulations develop higher velocities than those found in ΛCDM simulations. The bulk motions of clusters attain ∼1000 km s -1 by low redshift, comparable to observations whereas ΛCDM simulated clusters tend to fall short. Similarly, high pairwise velocities are common in cluster-cluster collisions like the Bullet Cluster. There is also a propensity for the most massive clusters to be larger in QUMOND and to appear earlier than in ΛCDM, potentially providing an explanation for "pink elephants" like El Gordo. However, it is not obvious that the cluster mass function can be recovered.

Original languageEnglish
Article number10
JournalAstrophysical Journal
Issue number1
Publication statusPublished - Jul 20 2013

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Space and Planetary Science
  • Astronomy and Astrophysics


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