2002/02/28 by S. Majerowicz, Sebastien Majerowicz, Doris M. Neumann +3 · 3 citations
Physics and Astronomy · #Abell 2744 #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Star Formation Studies #Background subtraction #Baryon #Big Bang nucleosynthesis #Cluster (spacecraft) #Cosmology #Galaxies: Formation, Evolution, Phenomena #Galaxy #Galaxy cluster #Galaxy groups and clusters #Hydrostatic equilibrium #Mass fraction #Nucleosynthesis #Physics #Stars #astro-ph
paper · pdf · doi:10.1051/0004-6361:20021140
published as Astron.Astrophys. 394 (2002) 77-88 · 12 pages, 16 figures and 3 tables, accepted for publication in Astronomy & Astrophysics
arxiv created 2002/08/28 · openalex publication_date 2002/10/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 β-model and the temperature profile. For the determination of the temperature profile of the icm, 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 r200 with a temperature decrease towards the center linked to the cooling flow. We obtain a gas mass fraction of ()%, 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 , which is in good agreement with other recent studies.