A Measurement of the Hubble Constant from the X-Ray Properties and the Sunyaev-Zeldovich Effect of CL 0016+16
A Measurement of the Hubble Constant from the X-Ray Properties and the Sunyaev-Zeldovich Effect of CL 0016+16
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从 X 射线特性和 CL 0016 16 的 Sunyaev-Zeldovich 效应测量哈勃常数
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
M. Birkinshaw
中科院分区：
文献类型：
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作者：
J. Hughes;M. Birkinshaw
通过对遥远富星系团CL 0016+16的X射线性质和Sunyaev-Zeldovich效应的比较，确定了哈勃常数的一个值。集群，由ROSAT PSPC成像，是显着的椭圆形，我们提出了我们已经开发的技术，包括在我们的分析。假设气体分布是平滑的、等温的，我们得到H 0 =47+ 23−15 km s-1 Mpc-1，其中的误差包括系统和随机的不确定性，但纯粹是观测的。由于扁长和扁圆的几何形状以及任意倾角，椭圆表面亮度分布的去投影系统误差在H 0中引入了±17%的额外分数误差。在CL 0016+16（z = 0.5455）的红移下，宇宙学参数对导出的H 0值的影响为10%-20%;我们引用q 0 = 0.1的结果。结合这一结果与其他7个星团的X射线/SZ效应H_0的测定，并考虑到我们的星团大气模型中的系统不确定性，我们发现一个集合值H_0 = 42-61 km s-1 Mpc-1与一个额外的随机误差为± 16%。
A value of the Hubble constant has been determined from a comparison of the X-ray properties and Sunyaev-Zeldovich effect of the distant rich cluster of galaxies CL 0016+16. The cluster, as imaged by the ROSAT PSPC, is significantly elliptical, and we present the techniques we have developed to include this in our analysis. Assuming a smooth, isothermal gas distribution, we obtain a value H0=47+ 23−15 km s-1 Mpc-1, where the errors include systematic and random uncertainties but are purely observational. Systematic errors in deprojecting the elliptical surface brightness distribution due to prolate and oblate geometries as well as arbitrary inclination angles, introduce an additional fractional error of ±17% in H0. At the redshift of CL 0016+16 (z = 0.5455) the effect of the cosmological parameters on the derived H0 value is of order 10%-20%; we quote results for q0 = 0.1. Combining this result with X-ray/SZ effect H0 determinations from seven other clusters and taking account of systematic uncertainties in our models for the cluster atmosphere, we find an ensemble value of H0 = 42-61 km s-1 Mpc-1 with an additional random error of ±16%.