发表机构
Landessternwarte, Zentrum für Astronomie der Universität Heidelberg; Heidelberg Institute for Theoretical Studies; LBT Observatory, University of Arizona（海德堡大学天文台; 海德堡理论研究所; 亚利桑那大学LBT天文台）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
研究探测到复合星系NGC 6764含三星核，其间距远小于已知AGN三重体，需近红外积分场光谱学确定各成分本质。
AI 中文摘要
我们报告了利用大双筒望远镜上的LUCI/SOUL设备获得的复合赛弗特2星系和沃尔夫-拉叶星系NGC 6764（距离D=32兆秒差距）的自适应光学Ks波段成像结果。该星系核可分解为三个致密源，两两投影间距为0.07-0.20角秒，对应11.0-30.9秒差距。三个源的H、Ks、H₂和Br-γ颜色无明显差异，仅靠测光无法区分吸积活动与恒星形成。该系统符合一个赛弗特核加两个恒星形成区的特征，但也不能排除双或三重活动星系核（AGN）的可能性；若为后者，其间距将比迄今已证实或候选的AGN三重体小两个数量级。需借助衍射极限近红外积分场光谱学确定每个成分的本质。
英文摘要
We report adaptive-optics Ks-band imaging of the composite Seyfert 2 and Wolf-Rayet galaxy NGC 6764 (D = 32 Mpc), obtained with LUCI/SOUL at the Large Binocular Telescope. The nucleus resolves into three compact sources with pairwise projected separations of 0.07-0.20 arcsec, corresponding to 11.0-30.9 pc. All three have indistinguishable H, Ks, H2, and Br-gamma colours, so photometry alone cannot separate accretion from star formation. The system is consistent with a Seyfert nucleus and two star-forming regions, but a dual or triple AGN cannot be excluded. In the latter case, the separations would be two orders of magnitude smaller than in any confirmed or candidate AGN triplet reported to date. Diffraction-limited near-infrared integral-field spectroscopy is required to establish the nature of each component.
Comments3 pages, 1 figure, accepted in RNAAS
