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: firstname.lastname@example.org
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