Abundance constraints and direct redshift measurement of the diffuse x-ray emission from a distant cluster of galaxies

Yasuhiro Hashimoto, X. Barcons, H. Böhringer, A. C. Fabian, G. Hasinger, V. Mainieri, H. Brunner

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

We report on the XMM-Newton (XMM) observation of RX J1053.7+5735, one of the most distant X-ray selected clusters of galaxies, which also shows an unusual double-lobed X-ray morphology, indicative of a possible equal-mass cluster merger. The cluster was discovered during the ROSAT deep pointings in the direction of the Lockman Hole. All XMM Lockman Hole observations (PV, AO-1 & AO-2 phases) with the European Photon Imaging Camera (EPIC) were combined for the analysis, totaling exposure times ∼648 ks, 738 ks, and 758 ks for pn, MOS1, and MOS2, respectively. With this "deep" dataset, we could detect the Fe K line and obtain a strong constraint on cluster metallicity, which is difficult to achieve for clusters at z > 1. The best-fit abundance is 0.46+-0.07 +0.11 times the solar value. The Fe line emission also allows us to directly estimate the redshift of diffuse gas, with a value z = 1.14-0.01 +0.01 This is one of the first clusters whose X-ray redshift is directly measured prior to the secure knowledge of cluster redshift by optical/NIR spectroscopy. We could also estimate the X-ray redshift separately for each of the two lobes in the double-lobed structure, and the result is consistent with the two lobes being part of one cluster system at the same redshift. Comparison with other metallicity measurements of nearby and distant clusters shows that there is little evolution in the ICM metallicity from z ∼ 1 to the present.

Original languageEnglish
Pages (from-to)819-825
Number of pages7
JournalAstronomy and Astrophysics
Volume417
Issue number3
DOIs
Publication statusPublished - 2004 Apr 1

Fingerprint

galaxies
x rays
XMM-Newton telescope
metallicity
merger
lobes
spectroscopy
K lines
gas
estimates
newton
cameras
photons
gases
exposure
analysis
comparison

Keywords

  • Cosmology: cosmological parameters
  • Galaxies: high-redshift
  • X-rays: galaxies: clusters

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Abundance constraints and direct redshift measurement of the diffuse x-ray emission from a distant cluster of galaxies. / Hashimoto, Yasuhiro; Barcons, X.; Böhringer, H.; Fabian, A. C.; Hasinger, G.; Mainieri, V.; Brunner, H.

In: Astronomy and Astrophysics, Vol. 417, No. 3, 01.04.2004, p. 819-825.

Research output: Contribution to journalArticle

Hashimoto, Yasuhiro ; Barcons, X. ; Böhringer, H. ; Fabian, A. C. ; Hasinger, G. ; Mainieri, V. ; Brunner, H. / Abundance constraints and direct redshift measurement of the diffuse x-ray emission from a distant cluster of galaxies. In: Astronomy and Astrophysics. 2004 ; Vol. 417, No. 3. pp. 819-825.
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