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  Determining subparsec supermassive black hole binary orbits with infrared interferometry

Dexter, J., Lutz, D., Shimizu, T. T., Jinyi, S., Davies, R. I., de Zeeuw, P. T., et al. (2020). Determining subparsec supermassive black hole binary orbits with infrared interferometry. The Astrophysical Journal, 905(1): 33. doi:10.3847/1538-4357/abc24f.

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Dexter, Jason, Author
Lutz, Dieter1, Author              
Shimizu, T. Taro1, Author              
Jinyi, Shangguan1, Author              
Davies, Richard I.1, Author              
de Zeeuw, P. Tim1, Author              
Sturm, Eckhard1, Author              
Eisenhauer, Frank1, Author              
Förster-Schreiber, Natascha M.1, Author              
Gao, Feng1, Author              
Genzel, Reinhard1, Author              
Gillessen, Stefan1, Author              
Pfuhl, Oliver, Author
Tacconi, Linda J.1, Author              
Widmann, Felix1, Author              
Affiliations:
1Infrared and Submillimeter Astronomy, MPI for Extraterrestrial Physics, Max Planck Society, ou_159889              

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 Abstract: Radial-velocity monitoring has revealed the presence of moving broad emission lines in some quasars, potentially indicating the presence of a subparsec binary system. Phase-referenced, near-infrared interferometric observations could map out the binary orbit by measuring the photocenter difference between a broad emission line and the hot dust continuum. We show that astrometric data over several years may be able to detect proper motions and accelerations, confirming the presence of a binary and constraining system parameters. The brightness, redshifts, and astrometric sizes of current candidates are well matched to the capabilities of the upgraded Very Large Telescope Interferometer/GRAVITY+ instrument, and we identify a first sample of 10 possible candidates. The astrometric signature depends on the morphology and evolution of hot dust emission in supermassive black hole binary systems. Measurements of the photocenter offset may reveal binary motion whether the hot dust emission region is fixed to the inner edge of the circumbinary disk, or moves in response to the changing irradiation pattern from an accreting secondary black hole.

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 Dates: 2020-12-09
 Publication Status: Published online
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 Identifiers: DOI: 10.3847/1538-4357/abc24f
Other: LOCALID: 3286517
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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 905 (1) Sequence Number: 33 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3