GALAXY CLUSTER BULK FLOWS AND COLLISION VELOCITIES IN QUMOND

Journal article

Authors / Editors

Angus, Garry

Research Areas

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Publication Details

Author list: Katz H, McGaugh S, Teuben P, Angus GW

Publisher: American Astronomical Society

Place: BRISTOL

Publication year: 2013

Journal: The Astrophysical Journal (0004-637X)

Journal acronym: ASTROPHYS J

Volume number: 772

Issue number: 1

Number of pages: 9

ISSN: 0004-637X

eISSN: 1538-4357

Languages: English-Great Britain (EN-GB)

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Abstract

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 Lambda CDM simulations. The bulk motions of clusters attain similar to 1000 km s(-1) by low redshift, comparable to observations whereas Lambda CDM 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 Lambda CDM, potentially providing an explanation for "pink elephants" like El Gordo. However, it is not obvious that the cluster mass function can be recovered.

Keywords

galaxies: clusters: general, large-scale structure of Universe

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