Abstract
Very high-energy (VHE) and ultra high-energy (UHE) γ rays, at around 1 TeV and 1 PeV respectively, have been observed from Cygnus X-3 predominantly in two distinct regions of orbital phase. Here we investigate whether this can be understood in terms of the accretion disk corona model of White and Holt1 developed to explain the asymmetric light curve of the low-mass X-ray binary system X1822–371. In this model, two bulges in the outer rim of the accretion disk are required to fit the observed X-ray light curve and we find these could provide target material for the production of the γ rays observed at two distinct phases. We show also that magnetic steering effects may be inevitable in Cyg X-3 and may lead to a natural explanation to the observed variability in flux and phase of γ-ray emission.
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References
1. White, N. E. & Holt, S. S. Astrophys. J. 257, 318–337 (1982). 2. Weekes, T. C. in Proc. Vlth Astrophys. Meet. XXIst Rencontre de Moriond (in the press). 3. Watson, A. A. Proc. 19th Int. Cosmic Ray Conf. (La Jolla) 9, (ed. Jones, F. C.) 111–140 (NASA, Washington DC, 1985). 4. Protheroe, R. J. Proc. astr. Soc. Astr. 6, 280–289 (1986). 5. Eichler, D. Nature 275, 725–726 (1978). 6. Eichler, D. & Vestrand, W. T. Proc. 16th Int. Cosmic Ray Conf. (Kyoto) 1,147–149 (Institute for Cosmic Ray Research, Tokyo, 1979). 7. Berezinsky, V. S. Proc. DUMAND 1979 Summer Workshops at Khabarovsk and Lake Baikal 245–261 (1979). 8. Vestrand, W. T. & Eichler, D. Astrophys. J. 261, 251–258 (1982). 9. Hillas, A. M. Nature 312, 50–51 (1984). 10. Hillas, A. M. Proc. 19th Int. Cosmic Ray Conf. (La Jolla) 2 (ed. Jones, F. C.) 296–299 (NASA, Washington DC, 1985). 11. Mason, K. O. & Cordova, F. A. Astrophys. J. 262, 253–262 (1982). 12. Shakura, N. I. & Sunyaev, R. A. Astr. Astrophys. 24, 337–355 (1973). 13. Hillas, A. M. Proc. NATO Advanced Research Workshop on High Energy Gamma Ray Astronomy and Related Topics (ed. Turver, K. E.) (Reidel, Dordrecht, in the press). 14. van den Heuvel, E. P. J. & De Loore, C. Astr. Astrophys. 25, 387–395 (1973). 15. Petterson, J. A. Accretion Discs in Close Binary Systems (eds Lewin, W. G. H. & van den Heuvel, E. P. J.) 367–391 (Cambridge University Press, 1983). 16. van der KJis, M. & Bonnet-Bidaud, J. M. Astr. Astrophys. 95, L5–L7 (1981). 17. Gorham, P. W. & Learned, J. Nature 323, 422–424 (1986). 18. Gorham, P. W. et al. Astrophys. J. 308, L11–L15 (1986). 19. Alien, C. W. Astrophysical Quantities (Athlone, London, 1973). 20. Marcy, G. W. IAU Symp. 102, Solar and Stellar Magnetic Fields: Origin and Coronal Effects (ed. Stenflo, J. O.) 3–22 (Reidel, Dordrecht, 1983). 21. Borra, E. F., Landstreet, J. D. & Mestel, L. A. Rev. Astr. Astrophys. 20, 191–220 (1982). 22. Chanmugam, G. & Brecher, K. Nature 313, 767–768 (1985). 23. Gaisser, T. K. et al. Astrophys. J. (in the press). 24. Chadwick, P. M. et al. Nature 318, 642–644 (1985). 25. Baliunas, S. L. & Vaughan, A. H. A. Rev. Astr. Astrophys. 23, 379–412 (1985). 26. Lambert, A. et al. Proc. 19th Int. Cosmic Ray Conf. (La Jolla} 1 (ed. Jones, F. C.) 71–74 (NASA, Washington DC, 1985). 27. Cawley, M. F. et al. Astrophys. J. 296, 185–189 (1985). 28. Lloyd-Evans, J. et al. Nature 305, 784–787 (1983) 29. Samorski, M. A. & Stamm, W. Astrophys. J. 268, L17–L22 (1983). 30. Protheroe, R. J. Astr. Exp. 1, 33–38 (1984).
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Protheroe, R., Stanev, T. Possible explanation of the γ-ray light curve and time variability in Cygnus X-3. Nature 328, 136–139 (1987). https://doi.org/10.1038/328136a0
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DOI: https://doi.org/10.1038/328136a0
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