Primary black hole spin in OJ 287 as determined by the general relativity centenary flare
- Valtonen, M. J.
- Zoła, Stanisław
- Ciprini, S.
- Gopakumar, A.
- Matsumoto, K.
- Sadakane, K.
- Kidger, M.
- Gazeas, K.
- Nilsson, K.
- Berdyugin, A.
- Piirola, V.
- Jermak, H.
- Baliyan, K. S.
- Alicavus, F.
- Boyd, D.
- Campas Torrent, M.
- Campos, F.
- Carrillo Gómez, J.
- Caton, D. B.
- Chavushyan, V.
- Dalessio, J.
- Dębski, Bartłomiej
- Dimitrov, D.
- Drozdz, M.
- Er, H.
- Erdem, A.
- Escartin Pérez, A.
- Fallah Ramazani, V.
- Filippenko, A. V.
- Ganesh, S.
- Garcia, F.
- Gómez Pinilla, F.
- Gopinathan, M.
- Haislip, J. B.
- Hudec, R.
- Hurst, G.
- Ivarsen, K. M.
- Jelinek, M.
- Joshi, A.
- Kagitani, M.
- Kaur, N.
- Keel, W. C.
- LaCluyze, A. P.
- Lee, B. C.
- Lindfors, E.
- Lozano de Haro, J.
- Moore, J. P.
- Mugrauer, M.
- Naves Nogues, R.
- Neely, A. W.
- Nelson, R. H.
- Ogloza, W.
- Okano, S.
- Pandey, J. C.
- Perri, M.
- Pihajoki, P.
- Poyner, G.
- Provencal, J.
- Pursimo, T.
- Raj, A.
- Reichart, D. E.
- Reinthal, R.
- Sadegi, S.
- Sakanoi, T.
- Salto González, J.-L.
- Sameer
- Schweyer, T.
- Siwak, Michał
- Soldán Alfaro, F. C.
- Sonbas, E.
- Steele, I.
- Stocke, J. T.
- Strobl, J.
- Takalo, L. O.
- Tomov, T.
- Tremosa Espasa, L.
- Valdes, J. R.
- Valero Pérez, J.
- Verrecchia, F.
- Webb, J. R.
- Yoneda, M.
- Zejmo, M.
- Zheng, W.
- Telting, J.
- Saario, J.
- Reynolds, T.
- Kvammen, A.
- Gafton, E.
- Karjalainen, R.
- Harmanen, J.
- Blay, P.
DOIAbstract
OJ 287 is a quasi-periodic quasar with roughly 12 year optical cycles. It displays prominent outbursts that are predictable in a binary black hole model. The model predicted a major optical outburst in 2015 December. We found that the outburst did occur within the expected time range, peaking on 2015 December 5 at magnitude 12.9 in the optical R-band. Based on Swift/XRT satellite measurements and optical polarization data, we find that it included a major thermal component. Its timing provides an accurate estimate for the spin of the primary black hole, x=0.313 $\pm$ 0.01. The present outburst also confirms the established general relativistic properties of the system such as the loss of orbital energy to gravitational radiation at the 2% a...
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