Journal
ASTRONOMY & ASTROPHYSICS
Volume 394, Issue 1, Pages 77-87Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20021140
Keywords
galaxies : clusters : individual : Abell 1835; galaxies : clusters : general; galaxies : cooling flows; cosmology : observations
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We present a study of the medium distant cluster of galaxies Abell 1835 based on XMM-NEWTON data. The high quality of XMM-NEWTON data enable us to perform spectro-imaging of the cluster up to large radii. We determine the gas and total mass profiles based on the hydrostatic approach using the beta-model and the temperature profile. For the determination of the temperature profile of the, which is needed for the mass determination, we apply a double background subtraction, which accounts for the various kinds of background present (particle and astrophysical background). We find a basically flat temperature profile up to 0.75 r(200) with a temperature decrease towards the center linked to the cooling flow. We obtain a gas mass fraction of (20.7 +/- 3.7)%, which is a lower limit on the baryon fraction in this cluster. Using this value as baryon fraction for the entire Universe, we obtain by combining our results with results based on primordial nucleosynthesis, an upper limit for Omega(m) < 0.5h(50)(-1/2), which is in good agreement with other recent studies.
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