High angular resolution observation of the Sunyaev-Zel'dovich effect in the massive z ≈ 0.83 cluster Cl J0152-1357

M. Massardi*, R. D. Ekers, S. C. Ellis, B. Maughan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


X-ray observations of galaxy clusters at high redshift (z ≳ 0.5) indicate that they are more morphologically complex and less virialized than those at low redshift. We present the first subarcminute resolution synthesis observations at 18 GHz of the Sunyaev-Zel'dovich (SZ) effect for Cl J0152-1357 using the Australia Telescope Compact Array. Cl J0152-1357 is a massive cluster at redshift z = 0.83 and has a complex structure including several merging subclumps which have been studied at optical, X-ray, and radio wavelengths. Our high-resolution observations indicate a clear displacement of the maximum SZ effect from the peak of X-ray emission for the most massive subclump. This result shows that the cluster gas within the cluster substructures is not virialized in Cl J0152-1357, and we suggest that it is still recovering from a recent merger event. A similar offset of the SZ effect has recently been seen in the "bullet cluster" and in RX J1347-1145. This non-equilibrium situation implies that high-resolution observations are necessary to investigate galaxy cluster evolution and to extract cosmological constraints from a comparison of the SZ effect and X-ray signals.

Original languageEnglish
Pages (from-to)L23-L26
Number of pages4
JournalAstrophysical Journal Letters
Issue number1
Publication statusPublished - 20 Jul 2010
Externally publishedYes


  • cosmological parameters
  • galaxies: clusters: individual (Cl J0152-1357)
  • techniques: interferometric


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