A&A 365, L104-L109 (2001)
X-ray imaging-spectroscopy of Abell 1835J. R. Peterson1, F. B. S. Paerels1, J. S. Kaastra2, M. Arnaud3, T. H. Reiprich4, A. C. Fabian5, R. F. Mushotzky6, J. G. Jernigan7 and I. Sakelliou8.
1 Columbia Department of Physics and Astrophysics Laboratory, 550 W 120th St., New York, NY 10027, USA
2 SRON Laboratory for Space Research Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
3 CEA/DSM/DAPNIA Saclay, Service d'Astrophysique, L'Orme des Merisiers, Bât. 709, 91191 Gif-sur-Yvette, France
4 Max-Planck-Institut für extraterrestrische Physik, PO Box 1312, 85741 Garching, Germany
5 Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
6 NASA/GFSC, Code 662, Greenbelt, MD, 20771, USA
7 Space Sciences Laboratory, University of California, Berkeley, CA 94720, USA
8 Mullard Space Science Laboratory, UCL, Holmbury St. Mary, Dorking, Surrey RH5 6NT, UK
(Received 2 October 2000 / Accepted 2 November 2000)
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 ), 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 ( keV) outer envelope. We detect O VIII Ly and two Fe XXIV complexes in the RGS spectrum. The emission measure of the cool gas below 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.
Key words: galaxy clusters: individual: Abell 1835 - galaxies: cooling flows - techniques: spectroscopic
Offprint request: J. R. Peterson, firstname.lastname@example.org
© ESO 2001