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During an XMM-Newton observation of the galactic supernova remnant G21.5-09 abright, previously uncatalogued, source (XMMU J183225.4-103645) was detected 18arcmin from G21.5-09. The European Photon Imaging Camera data inside 1 arcmin(180/h_50 kpc) radius are consistent with a source at a redshift of 0.1242[+0.0003, -0.0022] with an optically thin thermal spectrum of temperature 5.8+- 0.6 keV and a metal abundance of 0.60 +- 0.10 solar. This model gives a 2 -10 keV luminosity of 3.5[+0.8, -0.4]/h_50^2 10^44 erg/s. These characteristics,as well as the source extent of 2.0 arcmin (350/h_50 kpc), and the surfacebrightness profile are consistent with emission from the central region of amoderately rich cluster containing a cooling flow with mass flow rate of400-600 M_Sun/yr. The absorption is 7.9 +- 0.5 10^22 atom/cm^2, 5 times thatinferred from low-resolution HI data but consistent with higher spatialresolution infrared dust extinction estimates. XMMU J183225.4-103645 is notvisible in earlier ROSAT observations due to high amount of absorption. Thisdiscovery demonstrates the capability of XMM-Newton to map the clusterdistribution close to the Galactic plane, where few such systems are known. Theability of XMM-Newton to determine cluster redshifts to 1% precision at z = 0.1is especially important in optically crowded and absorbed fields such as closeto the Galactic plane, where the optical redshift measurements of galaxies aredifficult.Comment: Accepted for publication in Astronomy & Astrophysics, source name  correcte

Discovery of an absorbed cluster of galaxies (XMMU J183225.4-103645) close to the Galactic plane with XMM-Newton