| Issue |
A&A
Volume 487, Number 2, August IV 2008
|
|
|---|---|---|
| Page(s) | L33 - L36 | |
| Section | Letters | |
| DOI | https://doi.org/10.1051/0004-6361:200810255 | |
| Published online | 01 July 2008 | |
Letter to the Editor
2XMM J083026+524133: the most X-ray luminous cluster at redshift 1
Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany e-mail: glamer@aip.de
Received:
25
May
2008
Accepted:
23
June
2008
Aims. 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 
.
Methods. 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.
Results. We determined the redshift 0.99 ± 0.03 for 2XMM J083026.2+524133 from its X-ray spectrum.
With a bolometric luminosity of 1.8 
this is
the most X-ray luminous cluster at redshifts 
.
We measured a gas temperature of 8.2 ± 0.9 keV
and estimate a cluster mass 
.
The optical imaging revealed a rich cluster of galaxies.
Key words: galaxies: clusters: individual: 2XMM J083026.2+524133 / X-rays: galaxies: clusters
© ESO, 2008
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