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arXiv 1407.7301astro-ph.GA
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来自甚长基线阵列的证据:J1502SE/SW是双热点,而不是超大质量双星黑洞

Evidence from the Very Long Baseline Array that J1502SE/SW are Double Hotspots, not a Supermassive Binary Black Hole

J. M. Wrobel, R. C. Walker, H. Fu

摘要:

SDSS J150243.09+111557.3是一个z = 0.39的合并系统,拥有两个确认的活动星系核,一个未被遮蔽,一个被尘埃遮蔽,偏移了几千秒差距。Deane等人最近报道了来自欧洲VLBI网络(EVN)的证据,尘埃遮蔽的活动星系核显示出两个平谱射电源,J1502 SE/SW,偏移26 mas(140 pc),每个源都由自己的超大质量黑洞(BH)提供能量。这种对密近双星BH的有趣解释是在排除了双热点的情况后得出的,其中两个热点都由一个单一的中心BH提供能量,这种配置发生在研究充分的紧凑对称天体中。当以足够的灵敏度和分辨率观察时,具有双热点的物体应该具有边缘增亮结构。我们报告的证据,从甚长基线阵列(VLBA)的只是这样一个结构的图像中的模糊AGN具有更高的灵敏度和分辨率比EVN图像。因此,我们的结论是,一个双热点的情况下,应重新考虑作为一个可行的解释J1502 SE/SW,并建议进一步VLBA测试的情况。一个双热点的情况下,可能有广泛的影响,在模糊AGN的反馈。我们还报告了一个VLBA探测高亮度温度emssion从unobscured活动星系核,是从J1502 SE/SW偏移几千秒差距。

英文摘要:

SDSS J150243.09+111557.3 is a merging system at z = 0.39 that hosts two confirmed AGN, one unobscured and one dust-obscured, offset by several kiloparsecs. Deane et al. recently reported evidence from the European VLBI Network (EVN) that the dust-obscured AGN exhibits two flat-spectrum radio sources, J1502SE/SW, offset by 26 mas (140 pc), with each source being energized by its own supermassive black hole (BH). This intriguing interpretation of a close binary BH was reached after ruling out a double-hotspot scenario, wherein both hotspots are energized by a single, central BH, a configuration occuring in the well-studied Compact Symmetric Objects. When observed with sufficient sensitivity and resolution, an object with double hotspots should have an edge-brightened structure. We report evidence from the Very Long Baseline Array (VLBA) for just such a structure in an image of the obscured AGN with higher sensitivity and resolution than the EVN images. We thus conclude that a double-hotspot scenario should be reconsidered as a viable interpretation for J1502SE/SW, and suggest further VLBA tests of that scenario. A double-hotspot scenario could have broad implications for feedback in obscured AGNs. We also report a VLBA detection of high-brightness-temperature emssion from the unobscured AGN that is offset several kiloparsecs from J1502SE/SW.

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