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The Rotational Profiles of Cluster Galaxies

Bilton, Lawrence E.; Hunt, Matthew; Pimbblet, Kevin A.; Roediger, Elke


Lawrence E. Bilton

Matthew Hunt

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Dr Elke Roediger
Senior Lecturer/ Director of Studies for Physics


We compile two samples of cluster galaxies with complimentary hydrodynamic and N-body analysis using FLASH code to ascertain how their differing populations drive their rotational profiles and to better understand their dynamical histories. We select our main cluster sample from the X-ray Galaxy Clusters Database (BAX), which are populated with Sloan Digital Sky Survey (SDSS) galaxies. The BAX clusters are tested for the presence of sub-structures, acting as proxies for core mergers, culminating in sub-samples of 8 merging and 25 non-merging galaxy clusters. An additional sample of 12 galaxy clusters with known dumbbell components is procured using galaxy data from the NASA/IPAC Extragalactic Database (NED) to compare against more extreme environments. BAX clusters of each sample are stacked onto a common RA-DEC space to produce rotational profiles within the range of $0.0 - 2.5$ $r_{200}$. Merging stacks possess stronger core rotation at $\lesssim 0.5 r_{200}$ primarily contributed by a red galaxy sub-population from relaxing core mergers, this is alongside high rotational velocities from blue galaxy sub-populations, until, they mix and homogenise with the red sub-populations at $\sim r_{200}$, indicative of an infalling blue galaxy sub-population with interactive mixing between both sub-populations at $\gtrsim r_{200}$. FLASH code is utilised to simulate the merger phase between two originally independent clusters and test the evolution of their rotational profiles. Comparisons with the dumbbell clusters leads to the inference that the peculiar core rotations of some dumbbell clusters are the result of the linear motions of core galaxies relaxing onto the potential during post second infall.


Bilton, L. E., Hunt, M., Pimbblet, K. A., & Roediger, E. (2019). The Rotational Profiles of Cluster Galaxies. Monthly notices of the Royal Astronomical Society, 490(4), 5017-5032.

Journal Article Type Article
Acceptance Date Oct 2, 2019
Online Publication Date Oct 21, 2019
Publication Date Oct 21, 2019
Deposit Date Nov 6, 2019
Publicly Available Date Nov 30, -0001
Journal Monthly notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 490
Issue 4
Pages 5017-5032
Keywords Astrophysics of Galaxies
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Copyright Statement
© 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

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