Abstract
We here investigate the dispersion properties of radiation in the SS433 relativistic jets. We assume that the jet is composed of cold electron-proton plasma immersed in a predominantly parallel magnetic field to the jet axis. We find that for the mildly relativistic source SS433 (for which 〈ψ〉≃79°), the bulk velocity is too small (v≃0.26c) to produce significant changes in the dispersion properties of the medium. Nonetheless, in the rarefied outer regions of the jets, where radio emission dominates, even a weak magnetic field has some influence on the dispersion properties and there appear two different electromagnetic branches that are slightly sensitive to the bulk relativistic motion. In the inner, X-ray region, the magnetic field is much stronger, but in this region the high electron density preserves the isotropic character of the local plasma and no branch separation occurs. In the region of the jet where the IR and optical emission dominates, the cold plasma may be also considered isotropic, i.e., neither the magnetic field nor the bulk velocity is able to affect the propagation of the radiation. Finally, we find that the Doppler line displacement in SS433 is affected by plasma dispersion only in a narrow frequency range in the far IR. As a consequence, although the shift (z) modulation due to precession of the SS433 jets is well described by previous work, it has to be corrected by plasma dispersion effects in the far-IR range.
Similar content being viewed by others
References
Abell, G.O., Margon, B.: Nature 279, 701 (1979)
Bastian, T.S.: Astrophys. J. 426, 774 (1994)
Bolotowski, B.N.: Sovremennoe sostaianie elektrodinamiki dvizhusheisa sredax. In: Einshteinovskii Sbornik. Nauka, Moscow (1974)
Bolotowski, B.N., Stolayrov, S.N.: In: Einshteinovskii Sbornik 1974. Nauka, Moscow (1976)
Bolotowski, B.N., Stolayrov, S.N.: Polia istochnikov izluchenia v dvizhusheisa sredax. In: Einshteinovskii Sbornik. Nauka, Moscow (1983)
de Pater, I., Ip, W.-H.: Astrophys. J. 283, 895 (1984)
Downes, A.J.B., et al.: Astron. Astrophys. 103, 277 (1981)
Gabrilenko, B.G.: J. Exp. Theor. Phys. 41, 534 (1971)
Gabrilenko, B.G.: Radiofisica 15, 183 (1972)
Gabrilenko, B.G., et al.: Radiofisica 13, 700 (1970)
Ginzburg, V.A.: The Propagation of Electromagnetic Waves in Plasmas. Fizmatgiz, Moscow (1960)
Gnedin, Y.N., Lopez, E.D.: Sol. Phys. 164, 97 (1996)
Hjellming, R.M., Rupen, M.P.: Nature 375, 464 (1995)
Huang, Y.-X.: J. Mod. Opt. 44, 623 (1997)
in’t Zand, J.J. et al.: In: IAU Circ., vol. 7119 (1999)
in’t Zand, J.J., et al.: Astron. Astrophys. 357, 520 (2000)
Kalkofen, W.: Methods in Radiative Transfer. Cambridge University Press, Cambridge (1984)
Ko, H.C., Chuang, C.W.: Astrophys. J. 222, 1012 (1978)
Kotani, T., et al.: In: Koyama, K., Kitamoto, S., Itoh, M. (eds.) Proceedings of IAU Symposium No. 188, p. 358. Kluwer Academic, Dordrecht (1998)
Kunz, K.S.: J. Appl. Phys. 51, 873 (1980)
Lerche, I.: Astrophys. J. 187, 589 (1974)
Lopez, E.D.: Ph.D. thesis, Main Astronomical Observatory of Russian Academy of Sciences, St. Petersburg, Russia (1996a)
Lopez, E.D.: Dispersion properties of an Anisotropic Moving Plasma. Serie GAO RAN, No. 4. Glagol, St. Petersburg (1996b)
Lopez, E.D.: J. Plasma Phys. 70, 53 (2004)
Lopez, E.D.: Astrophys. J. 641, 710 (2006)
Margon, B.: Annu. Rev. Astron. Astrophys. 22, 507 (1984)
Margon, B., Anderson, S.: Astrophys. J. 347, 454 (1989)
Margon, B., et al.: Astrophys. J. 233, 63 (1979a)
Margon, B., et al.: Bull. Am. Astron. Soc. 11, 786 (1979b)
Margon, B., et al.: Astrophys. J. 230, 41 (1979c)
Marshall, H.L.: Astrophys. J. 564, 941 (2002)
Melrose, D.B.: Plasma Phys. 15, 99 (1973)
Mihalas, D.: Stellar Atmospheres. Freeman, San Francisco (1978)
Mihalas, D., Weibel-Mihalas, B.: Foundations of Radiation Hydrodynamics. Oxford University Press, Oxford (1984)
Milgrom, M.: Astron. Astrophys. 76, 3 (1979)
Miller, M.A., et al.: Usp. Fiz. Nauk 121, 525 (1977)
Mirabel, I.F., Rodriguez, L.F.: Nature 371, 46 (1994)
Mirabel, I.F., Rodriguez, L.F.: Annu. Rev. Astron. Astrophys. 37, 409 (1999)
Niell, A.E., et al.: Astrophys. J. 250, 248 (1981)
Orosz, J.A., et al.: Astrophys. J. 555, 489 (2001)
Panferov, A.A.: Astron. Astrophys. 351, 156 (1999)
Romney, J.D., et al.: Astrophys. J. 321, 822 (1987)
Rose, W.K.: Mon. Not. R. Astron. Soc. 276, 1191 (1995)
Seaquist, E.R., et al.: Astrophys. J. 241, L77 (1980)
Shaham, J.: Vistas Astron. 25, 217 (1981)
Spencer, R.E.: Mon. Not. R. Astron. Soc. 209, 869 (1984)
Stolayrov, S.N.: In: Einshtenovskii Sbornik 1978–1979, p. 173. Nauka, Moscow (1978)
Sun, X., et al.: Bull. Am. Astron. Soc. 31, 1472 (1999)
Tamm, I.E.: In: Sobrannie Nauchnnix Trudov, vol. 1, p. 77. Nauka, Moscow (1975)
Vermeulen, R.C., et al.: Nature 328, 309 (1987)
Watson, M.G., et al.: Mon. Not. R. Astron. Soc. 222, 261 (1986)
Zhang, S.N., et al.: In: IAU Circ., vol. 6046. (1994)
Zhang, S.N., et al.: Astrophys. J. 479, 381 (1997)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Lopez, E.D., de Gouveia Dal Pino, E.M. Relativistic dispersion effects on SS433 jets. Astrophys Space Sci 314, 129–136 (2008). https://doi.org/10.1007/s10509-008-9747-1
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10509-008-9747-1