射电基础星表揭示的新一批近距离分离双AGN和双AGN候选体
A New Sample of Closely Separated Dual and Binary AGN Candidates Revealed with the Radio Fundamental Catalog
- U.S. Naval Research Laboratory（美国海军研究实验室）
- U.S. Naval Observatory（美国海军天文台）
- George Mason University（乔治梅森大学）
机构由 AI 辅助整理，请以论文原文为准。
AI总结：
本研究利用射电基础星表对BigMAC中的十个多AGN候选体进行详细射电分析，确认六个为双AGN，四个为喷流结构，并强调VLBI后续观测对发现最近SMBH对的重要性。
AI中文摘要：
大多重AGN星表（BigMAC）提供了首个文献完整的已确认及候选双AGN、双AGN和反冲活动星系核（AGN）的汇编。BigMAC为首次针对多重AGN（multi-AGN）的全天区射电研究提供了基础。射电基础星表（RFC）由四十年的甚长基线干涉测量（VLBI）观测组成，能够分辨秒差距尺度的结构。所有BigMAC候选和已确认的多重AGN均与RFC进行了交叉匹配，共突出显示了241个具有可用RFC成像的BigMAC源。我们首次详细分析了十个表现出多个致密分量、最可能是射电多重AGN的系统。利用多频射电及辅助多波段信息，我们评估了每个系统更符合双AGN/双AGN还是内禀喷流结构。其中六个系统的双AGN/双AGN性质得到我们射电分析的进一步支持，而其余四个系统则更可能由致密喷流活动解释。若干候选多重AGN系统表现出仅几秒差距到几十秒差距的投影分离。在许多情况下，秒差距尺度的射电分离比最初促使它们被选中的观测所推断的分离小几个数量级，这强调了VLBI后续观测的重要性。由于所有十个源都是国际天球参考系（ICRF）的成员，并显示出显著的固有射电结构，它们也代表了天体测量误差的潜在来源。这项工作将RFC确立为描述最近超大质量黑洞对的档案资源，同时改进未来的ICRF实现。
英文摘要：
The Big Multi-AGN Catalog (BigMAC) provides the first literature-complete compilation of confirmed and candidate dual, binary, and recoiling active galactic nuclei (AGN). The BigMAC provides a basis for the first population-wide radio study of multiple AGN (multi-AGN). The Radio Fundamental Catalog (RFC) is composed of four decades of Very Long Baseline Interferometry (VLBI) observations capable of resolving parsec-scale structure. All BigMAC candidate and confirmed multi-AGN were cross-matched to the RFC, highlighting a total of 241 BigMAC sources with available RFC imaging. We present the first detailed analysis of the ten systems exhibiting multiple compact components, most likely to be radio multi-AGN. Using multi-frequency radio and supporting multiwavelength information, we assess whether each system is more consistent with dual/binary AGN or intrinsic jet structure. The dual/binary nature of six systems is further supported by our radio analysis, while the four remaining systems are more plausibly explained by compact jet activity. Several candidate multi-AGN systems exhibit projected separations of only a few to tens of parsecs. In many cases, the parsec-scale radio separations are orders of magnitude smaller than the separations inferred from the observations that originally motivated their selection, emphasizing the importance of VLBI follow-up. Because all ten sources are members of the International Celestial Reference Frame (ICRF) and display significant intrinsic radio structure, they also represent potential sources of astrometric error. This work establishes the RFC as an archival resource for characterizing the closest SMBH pairs while improving future ICRF realizations.
