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首页> 外文期刊>The Astrophysical journal >THE XMM CLUSTER SURVEY: A MASSIVE GALAXY CLUSTER AT z = 1.45
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THE XMM CLUSTER SURVEY: A MASSIVE GALAXY CLUSTER AT z = 1.45

机译：XMM群集调查：z = 1.45时的大量星系群集

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摘要

We report the discovery of XMMXCS J2215.9—1738, a massive galaxy cluster at z = 1.45, which was found in the XMM Cluster Survey. The cluster candidate was initially identified as an extended X-ray source in archival XMM data. Optical spectroscopy shows that six galaxies within a ～60″ diameter region lie at z = 1.45 ± 0.01. Model fits to the X-ray spectra of the extended emission yield kT = 7.4_(-1.8)~(+2.7) keV (90% confidence); if there is an undetected central X-ray point source, then kT = 6.5_(-1.8)~(+2.6) keV. The bolometric X-ray luminosity is L_X = 4.4_(-0.6)~(+0.8) x 10~(44) ergs s~(-1) over a 2 Mpc radial region. The measured T_X, which is the highest for any known cluster at z > 1, suggests that this cluster is relatively massive for such a high redshift. The redshift of XMMXCS J2215.9—1738 is the highest currently known for a spectroscopically confirmed cluster of galaxies.
机译：我们报告了XMMXCS J2215.9-1738的发现，这是在XMM集群调查中发现的z = 1.45的巨大星系集群。最初，候选簇被识别为档案XMM数据中的扩展X射线源。光谱学表明，直径约60英寸的六个星系位于z = 1.45±0.01。模型适合扩展发射产率kT = 7.4 _（-1.8）〜（+2.7）keV（90％置信度）的X射线光谱；如果存在未检测到的中心X射线点源，则kT = 6.5 _（-1.8）〜（+2.6）keV。在2 Mpc径向区域上，辐射热测量X射线的亮度为L_X = 4.4 _（-0.6）〜（+0.8）x 10〜（44）ers s〜（-1）。在z> 1时，任何已知簇的最高T_X的测量值表明，对于如此高的红移，该簇相对较大。 XMMXCS J2215.9-1738的红移是光谱确认的星系团目前已知的最高值。

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