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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Discovery of an overlapping cluster in the Abell 1674 field with Suzaku
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Discovery of an overlapping cluster in the Abell 1674 field with Suzaku

机译：与朱雀在Abell 1674油田发现重叠星团

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摘要

We present the results of a Suzaku observation of Abell 1674, an optically very rich (richness class 3) cluster cataloged as z=0.1066. We discover the He-like Fe K-shell line from the central region for the first time, and find that the X-ray spectrum yields a high redshift of 0.215_(-0.006)~(+0.007). On the other hand, the spectrum of the south-western region is fitted with a redshift of 0.11±0.02 by the He-like Fe L-shell lines, consistent with the optically determined value. The gas temperature, metal abundance, and core radius of the X-ray emission in the central region are 3.8±0.2 keV, 0.20±0.05 Z_⊙, and 450±40 kpc, respectively, while those in the south-western region are 2.0±0.2 keV, 0.41_(-0.13)~(+0.17) Z_⊙, and 220_(-70)~(+90) kpc, respectively. These parameters are typical for clusters. We thus conclude that Abell 1674 consists of two independent clusters, A1674-C at z ～ 0.22 and A1674-SW at z ～ 0.11, overlapping along the line of sight. The X-ray luminosity of A1674-C within r=2Mpc is (15.9±0.6) × 10~(43) erg s~(-1) in the 0.1-2.4 keV energy band, while that for A1674-SW is (1.25±0.07) × 10~(43) erg s~(-1). Both are consistent with those expected from the L-T relation of clusters within a factor of 2. This is another supporting factor for our conclusion.
机译：我们提出了对Abell 1674的朱雀观测的结果，Abell 1674是分类为z = 0.1066的光学上非常丰富的3类星团。我们首次从中心区域发现了类似He的Fe K壳线，并发现X射线光谱产生了0.215 _（-0.006）〜（+0.007）的高红移。另一方面，西南部地区的光谱通过像He一样的Fe L-壳线拟合为0.11±0.02的红移，与光学测定值一致。中心区域的气体温度，金属丰度和X射线发射的芯半径分别为3.8±0.2 keV，0.20±0.05Z_⊙和450±40 kpc，而西南区域为2.0分别为±0.2 keV，0.41 _（-0.13）〜（+0.17）Z_⊙和220 _（-70）〜（+90）kpc。这些参数是群集的典型参数。因此，我们得出的结论是，Abell 1674由两个独立的星团组成，z〜0.22处的A1674-C和z〜0.11处的A1674-SW沿视线重叠。在r = 2Mpc内，A1674-C的X射线光度在0.1-2.4 keV能带中为（15.9±0.6）×10〜（43）erg s〜（-1），而A1674-SW的X射线光度为（1.25 ±0.07）×10〜（43）erg s〜（-1）。两者都与因群集的L-T关系所期望的因子2相一致。这是我们得出结论的另一个支持因素。

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