X-ray imaging-spectroscopy of Abell 1835
Kaastra, J. S.; Arnaud, M.; Fabian, A. C.; Mushotzky, R. F.; Reiprich, T. H.; Peterson, J. R.; Jernigan, J. G.; Paerels, F. B. S.; Sakelliou, I.
United States, Netherlands, France, Germany, United Kingdom
Abstract
We present detailed spatially-resolved spectroscopy results of the observation of Abell 1835 using the European Photon Imaging Cameras (EPIC) and the Reflection Grating Spectrometers (RGS) on the XMM-Newton observatory. Abell 1835 is a luminous (1046 ergs {s}-1), medium redshift (z=0.2523), X-ray emitting cluster of galaxies. The observations support the interpretation that large amounts of cool gas are present in a multi-phase medium surrounded by a hot (kT{e}=8.2 keV) outer envelope. We detect O VIII Lyalpha and two Fe XXIV complexes in the RGS spectrum. The emission measure of the cool gas below kT{e}=2.7 keV is much lower than expected from standard cooling-flow models, suggesting either a more complicated cooling process than simple isobaric radiative cooling or differential cold absorption of the cooler gas.