The Bullet cluster at its best: weighing stars, gas, and dark matter
The Bullet cluster at its best: weighing stars, gas, and dark matter
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子弹星团处于最佳状态：称量恒星、气体和暗物质
DOI：
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Johany Martinez
中科院分区：
文献类型：
--
作者：
D. Paraficz;D. Paraficz;J. Kneib;J. Richard;A. Morandi;M. Limousin;E. Jullo;Johany Martinez
目标。我们提出了一个新的强透镜质量重建子弹星系团（1 E 0657-56）在z = 0：296，基于WFC 3和ACS HST成像和VLT/FORS 2光谱。与之前发表的分析相比，强透镜约束经历了实质性的修改，现在有14个（6个新的和8个以前已知的）多重成像系统，其中3个已经通过光谱证实了红移（包括一个从这项工作中新测量的）。方法.重建的质量分布明确地包括三个质量分量的组合：（i）来自X射线观测的星系团内气体质量;（ii）由基本平面标度关系建模的星系团星系;（iii）暗物质。结果包括团簇内气体的模型是具有最佳贝叶斯证据的模型。该模型的总均方根值为0：158 0 0之间的预测和测量的图像位置的14个多个图像考虑。总均方根值接近HST/WFC 3和ACS的分辨率（0.07 0.15”FWHM），证明了我们的质量模型具有出色的精度。导出的质量模型证实了X射线气体和暗物质峰之间的空间偏移。在250 kpc的径向孔径内，总质量为2：5 +/- 0：1 +/- 10（14）M圆点时，星系晕质量占总质量的比例为f（s）= 11 +/- 5%.
Aims. We present a new strong lensing mass reconstruction of the Bullet cluster (1E 0657-56) at z = 0 : 296, based on WFC3 and ACS HST imaging and VLT/FORS2 spectroscopy. The strong lensing constraints underwent substantial revision compared to previously published analysis, there are now 14 (six new and eight previously known) multiply-imaged systems, of which three have spectroscopically confirmed redshifts (including one newly measured from this work). Methods. The reconstructed mass distribution explicitly included the combination of three mass components: (i) the intra-cluster gas mass derived from X-ray observation; (ii) the cluster galaxies modeled by their fundamental plane scaling relations and (iii) dark matter. Results. The model that includes the intra-cluster gas is the one with the best Bayesian evidence. This model has a total rms value of 0 : 158 0 0 between the predicted and measured image positions for the 14 multiple images considered. The proximity of the total rms to resolution of HST/WFC3 and ACS (0.07 0.15" FWHM) demonstrates the excellent precision of our mass model. The derived mass model confirms the spatial offset between the X-ray gas and dark matter peaks. The fraction of the galaxy halos mass to total mass is found to be f(s) = 11 +/- 5% for a total mass of 2 : 5 +/- 0 : 1 +/- 10(14) M-circle dot within a 250 kpc radial aperture.
DOI：
10.1111/j.1365-2966.2006.10948.x
发表时间：
2006-05
影响因子：
4.8
作者：
A. Halkola;S. Seitz;M. Pannella
通讯作者：
A. Halkola;S. Seitz;M. Pannella