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 z ⪆ 1.
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
Astronomy and Astrophysics
- Pub Date:
- August 2008
- galaxies: clusters: individual: <ASTROBJ>2XMM J083026.2+524133</ASTROBJ>;
- X-rays: galaxies: clusters;
- New version, as accepted for publication in Astronomy &