XMM-NEWTON observation of Abell 1835: Temperature, mass and gas mass fraction profiles
XMM-NEWTON observation of Abell 1835: Temperature, mass and gas mass fraction profiles
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DOI：
10.1051/0004-6361:20021140
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发表时间：
2002-02
影响因子：
6.5
通讯作者：
S. Majerowicz;D. Neumann;Thomas H. Reiprich CEASaclay SAp;F. Mpe;Garching;G. U. O. Virginia;
中科院分区：
文献类型：
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作者：
S. Majerowicz;D. Neumann;Thomas H. Reiprich CEASaclay SAp;F. Mpe;Garching;G. U. O. Virginia;
我们基于 X- 数据对中距离星系团 Abell 1835 进行了研究。 X- 数据的高质量使我们能够对大半径的星团进行光谱成像。我们使用 β 模型和温度分布基于静压方法确定气体和总质量分布。为了确定质量测定所需的 的温度分布，我们应用了双背景减法，它考虑了存在的各种背景（粒子和天体物理背景）。我们发现温度曲线基本平坦，高达 0.75r200，并且与冷却流相关的中心温度下降。我们得到的气体质量分数为 (20.7 ± 3.7)%，这是该星团中重子分数的下限。使用这个值作为整个宇宙的重子分数，我们将我们的结果与基于原始核合成的结果相结合，得到了 Ωm < 0.5h −1/2 50 的上限，这与其他最近的研究非常一致。
We present a study of the medium distant cluster of galaxies Abell 1835 based on X- data. The high quality of X- 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 , 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 0.75r200 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 Ωm < 0.5h −1/2 50 , which is in good agreement with other recent studies.