文章基本信息

标题：Discovery of a dual AGN at z ≃ 3.3 with 20 kpc separation
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作者：B. Husemann ; G. Worseck ; F. Arrigoni Battaia 等
期刊名称：Astronomy & Astrophysics
印刷版ISSN：0004-6361
电子版ISSN：1432-0746
出版年度：2018
卷号：610
DOI：10.1051/0004-6361/201732457
语种：English
出版社：EDP Sciences
摘要：A prediction of the current paradigm of the hierarchical assembly of galaxies is the presence of supermassive dual black holes at separations of a few kpc or less. In this context, we report the detection of a narrow-line emitter within the extended Lyαnebula (~120 kpc diameter) of the luminous radio-quiet quasi-stellar object (QSO) LBQS 0302–0019 atz= 3.286. We identify several high-ionization narrow emission lines (He II, C IV, C III) associated with this point-like source, which we have named “Jil”, which is only ~20 kpc (2.̋9) away from the QSO in projection. Emission-line diagnostics confirm that the source is likely powered by photoionization of an obscured active galactic nucleus (AGN) three orders of magnitude fainter than the QSO. The system represents the tightest unobscured/obscured dual AGN currently known atz> 3, highlighting the power of MUSE to detect these elusive systems.
关键词：KeywordsenTechniques: imaging spectroscopyUltraviolet: ISMgalaxies: high-redshiftquasars: individual: LBQS 0302–0019