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

Research output: Contribution to journalArticleResearchpeer-review

Abstract

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.

LanguageEnglish
PagesL23-L26
Number of pages4
JournalAstrophysical Journal Letters
Volume718
Issue number1
DOIs
Publication statusPublished - 20 Jul 2010
Externally publishedYes

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angular resolution
high resolution
x rays
merger
galaxies
radio
wavelength
substructures
effect
gas
telescopes
synthesis
gases
wavelengths

Keywords

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

Cite this

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title = "High angular resolution observation of the Sunyaev-Zel'dovich effect in the massive z ≈ 0.83 cluster Cl J0152-1357",
abstract = "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.",
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High angular resolution observation of the Sunyaev-Zel'dovich effect in the massive z ≈ 0.83 cluster Cl J0152-1357. / Massardi, M.; Ekers, R. D.; Ellis, S. C.; Maughan, B.

In: Astrophysical Journal Letters, Vol. 718, No. 1, 20.07.2010, p. L23-L26.

Research output: Contribution to journalArticleResearchpeer-review

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