ASCA Observation of the Distant Cluster of Galaxies Cl 0016+16 and Implication for H0
ASCA Observation of the Distant Cluster of Galaxies Cl 0016+16 and Implication for H0
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ASCA 对遥远星系团 Cl 0016 16 的观测及其对 H0 的影响
DOI：
10.1086/306040
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
R. Mushotzky
中科院分区：
文献类型：
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作者：
A. Furuzawa;Y. Tawara;H. Kunieda;K. Yamashita;T. Sonobe;Y. Tanaka;R. Mushotzky
我们报道了Cl0016+16的0.5-10keV X射线图像和光谱，它的红移为0.541，是ASCA观测到的最遥远的星系团之一。ASCA X射线图像可用等温β模型很好地描述。核心半径(θc)和β的最佳拟合参数分别为0.‘6和0.7。然而，由于ASCA的中等空间分辨率，这两个参数具有很强的相关性。用等离子体温度为8.0±1.0keV的薄热发射模型对6‘半径范围内的观测光谱进行了很好的拟合。Carlstrom等人在Cl0016+16中观察到了Sunyaev-Zeldovich(SZ)效应。使用干涉仪，并由Birkinshaw等人提出。使用单碟式射电望远镜。将SZ微波衰减值与X射线观测得到的等离子体密度和温度剖面相结合，利用干涉测量得到的剖面参数得到哈勃常数为47±14公里的S~(-1)mpc~(-1)，用我们的最佳形状参数和单盘望远镜数据得到的哈勃常数为52±20公里的S~(-1)mpc~(-1)。
We report the 0.5-10 keV X-ray image and spectrum of Cl 0016+16, which, at a redshift of 0.541, is one of the most distant clusters of galaxies observed with ASCA. The ASCA X-ray image is well represented by an isothermal β model. The best-fit parameters for the core radius (θc) and β are 0.′6 and 0.7, respectively. However, because of ASCA's moderate spatial resolution, these two parameters are strongly correlated. The observed spectrum within a 6' radius is well fitted by a thin thermal emission model with a plasma temperature of 8.0 ± 1.0 keV. The Sunyaev-Zeldovich (SZ) effect in Cl 0016+16 has been observed by Carlstrom et al. using an interferometer and by Birkinshaw et al. using a single-dish radio telescope. Combining the SZ microwave decrement with the plasma density and temperature profiles derived from our X-ray observation, we obtained a value of the Hubble constant of 47 ± 14 km s-1 Mpc-1 with the profile parameters obtained by interferometric data, and 52 ± 20 km s-1 Mpc-1 with our best-fit shape parameters and single-dish telescope data.