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arXiv 0902.2131astro-ph.CO
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利用Sunyaev-Zel 'dovich效应对星系团Abell 2163的多频成像

Multi-frequency imaging of the galaxy cluster Abell 2163 using the Sunyaev-Zel'dovich Effect

M. Nord, K. Basu, F. Pacaud, P. A. R. Ade, A. N. Bender, B. A. Benson, F. Bertoldi, H. -M. Cho, G. Chon, J. Clarke, M. Dobbs, D. Ferrusca, N. W. Halverson, W. L… 展开作者

M. Nord, K. Basu, F. Pacaud, P. A. R. Ade, A. N. Bender, B. A. Benson, F. Bertoldi, H. -M. Cho, G. Chon, J. Clarke, M. Dobbs, D. Ferrusca, N. W. Halverson, W. L. Holzapfel, C. Horellou, D. Johansson, J. Kennedy, Z. Kermish, R. Kneissl, T. Lanting, A. T. Lee, M. Lueker, J. Mehl, K. M. Menten, T. Plagge, C. L. Reichardt, P. L. Richards, R. Schaaf, D. Schwan, H. Spieler, C. Tucker, A. Weiss, O. Zahn

摘要:

我们使用APEX望远镜上的APEX-SZ和LABOCA测辐射热计相机来绘制Sunyaev-Zeldovich效应在150 GHz处的衰减和在345 GHz处向星系团Abell 2163的增量。SZE图像被用来模拟ICM的径向密度和温度分布,并在流体静力平衡的假设下推导出集团中的气体质量分数。我们使用等温β模型来拟合SZE减量/增量径向分布。我们进行了一个简单的,非参数反投影的径向密度和温度分布,结合XMM-牛顿X射线数据,简化假设的球对称。我们结合了本文中得出的峰值SZE信号与已发表的SZE测量这个集群,以获得集群的视线整体速度和中央康普顿化,使用ICM温度的先验。我们发现,SZE数据的最佳拟合等温模型与X射线数据所暗示的ICM属性是一致的,特别是在中心1 Mpc半径内。虽然流体静力平衡和球对称的假设可能不是最佳的这个复杂系统,在这些假设下得到的结果与X射线和弱透镜测量是一致的。这表明本文所述的简单联合SZE和X射线去投影技术对于具有广泛动力学状态的团簇的适用性。(节录)

英文摘要:

We used the APEX-SZ and LABOCA bolometer cameras on the APEX telescope to map the decrement of the Sunyaev-Zeldovich effect at 150 GHz and the increment at 345 GHz toward the galaxy cluster Abell 2163. The SZE images were used to model the radial density and temperature distribution of the ICM, and to derive the gas mass fraction in the cluster under the assumption of hydrostatic equilibrium. We used the isothermal beta model to fit the SZE decrement/increment radial profiles. We performed a simple, non-parametric de-projection of the radial density and temperature profiles, in conjunction with XMM-Newton X-ray data, under the simplifying assumption of spherical symmetry. We combined the peak SZE signals derived in this paper with published SZE measurements of this cluster to derive the cluster line-of-sight bulk velocity and the central Comptonization, using priors on the ICM temperature. We find that the best-fit isothermal model to the SZE data is consistent with the ICM properties implied by the X-ray data, particularly inside the central 1 Mpc radius. Although the assumptions of hydrostatic equilibrium and spherical symmetry may not be optimal for this complex system, the results obtained under these assumptions are consistent with X-ray and weak-lensing measurements. This shows the applicability of the simple joint SZE and X-ray de-projection technique described in this paper for clusters with a wide range of dynamical states. (Abridged)

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