A Compact Supermassive Binary Black Hole System
A Compact Supermassive Binary Black Hole System
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DOI：
10.1086/504825
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发表时间：
2006-04
期刊：
影响因子：
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通讯作者：
C. Rodriguez;G. Taylor;R. Zavala;A. Peck;L. K. Pollack;R. S. U. O. N. Mexico;U. S. Bolivar;
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文献类型：
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作者：
C. Rodriguez;G. Taylor;R. Zavala;A. Peck;L. K. Pollack;R. S. U. O. N. Mexico;U. S. Bolivar;
我们报告在射电星系0402+379中发现了一个超大质量的双黑洞系统，两个黑洞之间的预计距离仅为7.3 pc。这是迄今为止发现的最接近的黑洞对，超过2个数量级。这些结果是基于最近的多频观测使用甚长基线阵列（VLBA），它揭示了两个紧凑，可变，平谱，活跃的核内的椭圆主星系0402+379。VLBA的多历元观测也提供了对系统总质量和动力学的约束。使用霍比-埃伯利望远镜的低光谱分辨率光谱学显示了两个速度系统，两个黑洞的总质量约为1.5 × 108 M。两个原子核看起来是静止的，而从两个原子核中较弱的一个发出的喷流看起来是向外移动并终止于明亮的热点。这个系统的发现对可能是引力辐射源的近距离双星黑洞的数量有影响。本文还介绍了用绿色堤岸望远镜在22 GHz上观测这个有趣系统中的水脉泽。
We report on the discovery of a supermassive binary black hole system in the radio galaxy 0402+379, with a projected separation between the two black holes of just 7.3 pc. This is the closest black hole pair yet found by more than 2 orders of magnitude. These results are based on recent multifrequency observations using the Very Long Baseline Array (VLBA), which reveal two compact, variable, flat-spectrum, active nuclei within the elliptical host galaxy of 0402+379. Multiepoch observations from the VLBA also provide constraints on the total mass and dynamics of the system. Low spectral resolution spectroscopy using the Hobby-Eberly Telescope indicates two velocity systems with a combined mass of the two black holes of ~1.5 × 108 M☉. The two nuclei appear stationary, while the jets emanating from the weaker of the two nuclei appear to move out and terminate in bright hot spots. The discovery of this system has implications for the number of close binary black holes that might be sources of gravitational radiation. Green Bank Telescope observations at 22 GHz to search for water masers in this interesting system are also presented.