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The Evolving Shape of Galaxy Clusters

  • Dennis W. Just (a1), H. K. C. Yee (a1), Adam Muzzin (a2), Gillian Wilson (a3), David G. Gilbank (a4) and Michael Gladders (a5)...

Abstract

We present the first measurement of the evolution of the apparent projected shape of galaxy clusters from 0.2≲ z≲2. We measure the ellipticities (εcl) of homogeneously selected galaxy clusters over this wide redshift range. We confirm the predictions of N-body simulations that clusters are more elongated at higher redshift, finding the mean projected ellipticity changes linearly from 0.36±0.01 to 0.25±0.01 over that range. The fraction of relaxed clusters (defined as having ε cl <0.2) is 9+5-3% at z∼1.8, steadily increasing to 42+7-6% by z∼0.3. Because more spherical clusters have a higher degree of virialization, our result shows significant evolution in the degree of cluster virialization over cosmic time.

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References

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Gilbank, D. G., Gladders, M. D., Yee, H. K. C., & Hsieh, B. C. 2011, AJ, 141, 94
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Muzzin, A., Wilson, G., Demarco, R., et al. 2013, ApJ, 767, 39
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Wilson, G., Muzzin, A., Yee, H. K. C., et al. 2009 ApJ, 698, 1943
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