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arXiv · 0805.3817

2XMM J083026+524133: The most X-ray luminous cluster at redshift 1

G. Lamer·M. Hoeft·J. Kohnert·A. Schwope·J. Storm
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Abstract

In the distant universe X-ray luminous clusters of galaxies are rare objects. Large area surveys are therefore needed to probe the high luminosity end of the cluster population at redshifts z >= 1. We correlated extended X-ray sources from the second XMM-Newton source catalogue (2XMM) with the SDSS in order to identify new clusters of galaxies. Distant cluster candidates in empty SDSS fields were imaged in the R and z bands with the Large Binocular Telescope. We extracted the X-ray spectra of the cluster candidates and fitted thermal plasma models to the data. We determined the redshift 0.99 +-0.03 for 2XMM J083026+524133 from its X-ray spectrum. With a bolometric luminosity of 1.8 x 10^45 erg/sec this is the most X-ray luminous cluster at redshifts z >= 1. We measured a gas temperature of 8.2 +- 0.9 keV and and estimate a cluster mass M(500) = 5.6 x 10^14 M(solar). The optical imaging revealed a rich cluster of galaxies.

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G. Lamer, M. Hoeft, J. Kohnert, A. Schwope, J. Storm. 2008-08-25. 2XMM J083026+524133: The most X-ray luminous cluster at redshift 1. https://doi.org/10.1051/00046361%3A200810255

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