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Issue A&A
Volume 365, Number 1, January I 2001
First Results from XMM-Newton
Page(s) L104 - L109
DOI http://dx.doi.org/10.1051/0004-6361:20000021



A&A 365, L104-L109 (2001)
DOI: 10.1051/0004-6361:20000021

X-ray imaging-spectroscopy of Abell 1835

J. 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)

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 $\rm {s}^{-1}$), 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 ( $kT_{\rm {e}}=8.2$ keV) outer envelope. We detect O VIII Ly$\alpha$ and two Fe XXIV complexes in the RGS spectrum. The emission measure of the cool gas below $kT_{\rm {e}}=2.7$ 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.


Key words: galaxy clusters: individual: Abell 1835 - galaxies: cooling flows - techniques: spectroscopic

Offprint request: J. R. Peterson, jrpeters@astro.columbia.edu

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