The method for detection of the galaxy cluster rotation based on the study of distribution of member galaxies with velocities lower and higher than the cluster mean velocity over the cluster image is proposed. The search for rotation is made for flat clusters with a/b > 1.8 and BMI type clusters which are expected to be rotating. For comparison there were studied also round clusters and clusters of NBMI type, the second by brightness galaxy, which does not differ significantly from the cluster cD galaxy. Seventeen out of studied 65 clusters are found to be rotating. It was found that the detection rate is sufficiently high for flat clusters, over 60%, and clusters of BMI type with dominant cD galaxy, ≈ 35% . The obtained results show that clusters were formed from the huge primordial gas clouds and preserved the rotation of the primordial clouds, unless they did not experience mergings with other clusters and groups of galaxies, as a result of which the rotation was prevented.
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Published in Astrofizika, Vol. 58, No. 3, pp. 353-363 (August 2014).
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Tovmassian, H.M. The Rotation of Galaxy Clusters. Astrophysics 58, 328–337 (2015). https://doi.org/10.1007/s10511-015-9387-4
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DOI: https://doi.org/10.1007/s10511-015-9387-4