PKS 2131−021—Discovery of Strong Coherent Sinusoidal Variations from Radio to Optical Frequencies: Compelling Evidence for a Blazar Supermassive Black Hole Binary

Haystack and Owens Valley Radio Observatory observations recently revealed strong, intermittent, sinusoidal total flux-density variations that maintained their coherence between 1975 and 2021 in the blazar PKS 2131−021 ( z = 1.283). This was interpreted as possible evidence of a supermassive black h...

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Bibliographic Details
Main Authors:	S. Kiehlmann, P. V. de la Parra, A. G. Sullivan, A. Synani, I. Liodakis, P. Mróz, S. K. Næss, A. C. S. Readhead, M. C. Begelman, R. D. Blandford, K. Chatziioannou, Y. Ding, M. J. Graham, F. Harrison, D. C. Homan, T. Hovatta, S. R. Kulkarni, M.L. Lister, R. Maiolino, W. Max-Moerbeck, B. Molina, C. P. O’Dea, V. Pavlidou, T. J. Pearson, M.F. Aller, C. R. Lawrence, T. J. W. Lazio, S. O’Neill, T. A. Prince, V. Ravi, R.A. Reeves, K. Tassis, M. Vallisneri, J. A. Zensus
Format:	Article
Language:	English
Published:	IOP Publishing 2025-01-01
Series:	The Astrophysical Journal
Subjects:	Relativistic jets Radio jets Active galactic nuclei Supermassive black holes
Online Access:	https://doi.org/10.3847/1538-4357/adc567
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PKS 2131−021—Discovery of Strong Coherent Sinusoidal Variations from Radio to Optical Frequencies: Compelling Evidence for a Blazar Supermassive Black Hole Binary

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