Astrophysics and Space Science

, Volume 310, Issue 1–2, pp 59–63 | Cite as

A new model for the periodic outbursts of the BL Lac object OJ287

  • Weizhao ShiEmail author
  • Xiang Liu
  • Huagang Song
Original Article


Recent observations provide strong evidence for the BL Lac object OJ287 exhibiting a 11.6±0.5 yr periodicity with a double-peaked maxima in its optical flux variations. Several models have been proposed for the optical behavior. The 2005 November outburst in OJ287 gives us a surprising result since calculation based on the periodicity was predicting such an outburst in late 2006. Here we suggest a new model, it can not only explain the optical quasi-periodic behavior, but also the radio flares behavior which is and simultaneous with the optical flares. We propose that OJ287 is a binary pair of super-massive black holes, both of them creating a jet. The quasi-periodic double peaks would be due to the relativistic beaming effect on the emission coming from the double helix jets. We used “core flares” to explain the large lags between light curves at different frequencies, and the assumption of two jets appear to be merged with each other partly in the radio frequency emitting regions provides a viable interpretation that we can see only a broad maximum which contains two radio flares that we cannot distinguish.


Black hole physics: BL Lac objects: individual: OJ287 Radiation mechanisms: non-thermal 


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  1. Begelman, M.C., Blandford, R.D., Rees, M.J.: Nature 287, 307 (1980) CrossRefADSGoogle Scholar
  2. Bower, G.C., et al.: Astrophys. J. 484, 118 (1997) CrossRefADSGoogle Scholar
  3. Camenzind, M.: In: Belvedere, G. (ed.) Accretion Disks and Magnetic Fields in Astrophysics, p. 129. Kluwer, Dordrecht (1989) Google Scholar
  4. Hong, X.Y., et al.: Astron. Astrophys. 417, 887 (2004) CrossRefADSGoogle Scholar
  5. Kidger, M., Takalo, L., Sillanpaa, A.: Astron. Astrophys. 264, 32 (1992) ADSGoogle Scholar
  6. Lehto, H.J., Valtonen, M.J.: Astrophys. J. 460, 207 (1996) CrossRefADSGoogle Scholar
  7. Lobanov, A.P.: Mem. Soc. Astron. Ital. 76, 164 (2005) ADSGoogle Scholar
  8. Pietila, H., et al.: Astron. Astrophys. 345, 760 (1999) ADSGoogle Scholar
  9. Raiteri, C.M., et al.: Astron. Astrophys. 377, 396 (2001) CrossRefADSGoogle Scholar
  10. Sillanpaa, A., et al.: Astrophys. J. 325, 628 (1988) CrossRefADSGoogle Scholar
  11. Takalo, L.O.: Vistas Astron. 38, 77 (1994) CrossRefADSGoogle Scholar
  12. Valtaoja, E., et al.: Astrophys. J. 531, 744 (2000) CrossRefADSGoogle Scholar
  13. Valtonen, M.J., Lehto, H.J., Pietila, H.: Astron. Astrophys. 342, L29 (1999) ADSGoogle Scholar
  14. Villata, M., et al.: Mon. Not. Roy. Astron. Soc. 293, L13 (1998) CrossRefADSGoogle Scholar
  15. Zhou, J.F., et al.: Astrophys. J. 540, L13 (2000) CrossRefADSGoogle Scholar

Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  1. 1.Urumqi ObservatoryNational Astronomical ObservatoriesUrumqiChina
  2. 2.Graduate UniversityChinese Academy of SciencesBeijingChina

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