Chandra X射线光谱证据揭示引力透镜MG B2016+112在z=3.273处具有175 pc间距的双活动星系核性质
Chandra X-ray Spectral Evidence of the Dual AGN Nature of the Gravitational lens MG B2016+112 at z=3.273 with 175 pc separation
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中文总结 AI 辅助
基于Chandra X射线光谱分析，证实引力透镜MG B2016+112在z=3.273处存在间距仅175 pc的双活动星系核，为高红移最紧密AGN对提供确凿证据，并推动SMBH演化与引力波前兆研究。
中文摘要 AI 辅助
我们利用对z=3.273射电亮引力透镜系统MG B2016+112的一次新的175 ks Chandra X射线观测，提供了确凿的X射线光谱证据，表明该系统包含一个双活动星系核（AGN）。其投影间距为175秒差距，这是高红移下已确认的AGN对中最紧密的间距。此前的多历元甚长基线干涉测量（VLBI）和档案Chandra数据已揭示出两个不同的辐射源，但无法排除具有复杂、高度放大喷流的单一AGN的可能性。我们新的Chandra观测允许对每个源进行独立的光谱分析。我们发现，在焦散线内高度放大的源在其红移处存在强烈的内禀吸收（N_H > 4 x 10^22 cm^-2，3 sigma置信度）。这将其识别为一个被遮蔽的AGN。加上此前已知的位于焦散线外的II型AGN，这证实了MG B2016+112中存在一个致密双AGN系统。正在进行和未来的巡天项目，如Euclid、SKA以及Rubin和Roman天文台，将发现更多此类系统，从而探索超大质量黑洞（SMBH）的演化及引力波前兆。
英文摘要
We use a new 175 ks Chandra X-ray observation of the z=3.273 radio-loud gravitational lens system MG B2016+112 to present definitive X-ray spectral evidence that it contains a dual active galactic nucleus (AGN). With a projected separation of 175 parsecs, this is the tightest separation confirmed AGN pair at high redshift. Prior multi-epoch very long baseline interferometry (VLBI) and archival Chandra data had revealed two distinct emitters, but could not rule out a single AGN with a complex, highly magnified jet. Our new Chandra observations allow a separate spectral analysis of each source. We find strong intrinsic absorption (N_H > 4 x 10^22 cm^-2, 3 sigma confidence) at the source redshift for the highly magnified source inside the caustic. This identifies it as an obscured AGN. In addition to the previously known type II AGN outside the caustic, this confirms a compact dual AGN system in MG B2016+112. On-going and future surveys using facilities such as Euclid, SKA, and the Rubin and Roman observatories will uncover more such systems, probing SMBH evolution and gravitational wave precursors.
发表机构
- Department of Physics, University of Maryland Baltimore County（马里兰大学巴尔的摩分校物理系）
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