Astronomy Reports

, Volume 53, Issue 7, pp 579–589 | Cite as

Physical origins for variations in the apparent positions of quasars

  • V. E. Zharov
  • M. V. Sazhin
  • V. N. Sementsov
  • K. V. Kuimov
  • O. S. Sazhina


The physical origins of the apparent motion of radio sources in the ICRF are considered. The sources can be divided into four groups, according to the characteristics of their motion. Here, we consider the model for the motion of the first group of sources—those displaying uniform linear motion. Since the apparent speeds of the radio sources are close to, and sometimes exceeding, the speed of light, it is natural to suppose that these sources are relativistic jets or plasma clouds moving with speeds close to the speed of light. Uniform linear motion can be explained by a model invoking precession of the jet. We consider the physical characteristics of a number of selected sources of the ICRF in the proposed model.

PACS numbers

95.10.Jk 98.54.Aj 98.62.Nx 95.85.Bh 95.85.Kr 


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  1. 1.
    V. E. Zharov, Spherical Astronomy (Vek-2, Fryazino, 2006) [in Russian].Google Scholar
  2. 2.
    C. Ma, E. F. Arias, T. M. Eubanks, et al., Astron. J. 116, 516 (1998).CrossRefADSGoogle Scholar
  3. 3.
    Zh. Kovalevskii, Modern Astrometry (Vek-2, Fryazino, 2004) [in Russian].Google Scholar
  4. 4.
    E. L. Wright, Publ. Astron. Soc. Pacif. 118, 1711 (2006).CrossRefADSGoogle Scholar
  5. 5.
    D. C. MacMillan, in Future Directions in High Resolution Astronomy: A Celebration of the 10th Anniversary of the VLBA, Ed. by J. D. Romney and M. J. Reid, ASP Conf. Ser. 340, 477 (2005).Google Scholar
  6. 6.
    M. V. Sazhin, Pis’ma Astron. Zh. 22, 643 (1996) [Astron. Lett. 22, 573 (1996)].Google Scholar
  7. 7.
    M. V. Sazhin, V. E. Zharov, A. V. Volynkin, and T. A. Kalinina, Mon. Not. R. Astron. Soc. 300, 287 (1998).CrossRefADSGoogle Scholar
  8. 8.
    M. V. Sazhin, V. E. Zharov, and T. A. Kalinina, Mon. Not. R. Astron. Soc. 323, 952 (2001).CrossRefADSGoogle Scholar
  9. 9.
    Cosmic Astrometric Experiment OZIRIS, Ed. by L. V. Rykhlova and K. V. Kuimov (Vek-2, Fryazino, 2005), Ch. 3 [in Russian].Google Scholar
  10. 10.
    Ya. B. Zel’dovich and I. D. Novikov, Structure and Evolution of the Universe (Nauka, Moscow, 1975) [in Russian].Google Scholar
  11. 11.
    D. N. Spergel, R. Bean, O. Dore, et al., Astrophys. J. Suppl. Ser. 170, 377 (2007).CrossRefADSGoogle Scholar
  12. 12.
    S. Perlmutter, G. Aldering, M. Della Valle, et al., Nature 391, 51 (1998).CrossRefADSGoogle Scholar
  13. 13.
    M. C. Begelman, R. D. Blandford, and M. J. Rees, Rev. Mod. Phys. 56, 255 (1984).CrossRefADSGoogle Scholar
  14. 14.
    E. Koptelova, E. Shimanovskaya, B. Artamonov, and A. Yagola, Mon. Not. R. Astron. Soc. 381, 1655 (2007).CrossRefADSGoogle Scholar
  15. 15.
    R. D. Blandford and A. Königl, Astrophys. J. 232, 34 (1979).CrossRefADSGoogle Scholar
  16. 16.
    R. D. Blandford and R. L. Znajek, Mon. Not. R. Astron. Soc. 179, 433 (1977).ADSGoogle Scholar
  17. 17.
    R. D. Blandford, C. F. McKee, and M. J. Rees, Nature 267, 211 (1977).CrossRefADSGoogle Scholar
  18. 18.
    V. V. Davydov, V. F. Esipov, and A. M. Cherepashchuk, Astron. Zh. 85, 545 (2008) [Astron. Rep. 52, 487 (2008)].Google Scholar
  19. 19.
    R.W. Hunstead, H. S. Murdoch, J. J. Condon, et al., Mon. Not. R. Astron. Soc. 207, 55 (1984).ADSGoogle Scholar
  20. 20.
    Black Holes: the Membrane Paradigm, Ed. by K. Thorne, R. Price, and D. MacDonald (Yale Univ. Press, New Haven, 1986; Mir, Moscow, 1988).Google Scholar

Copyright information

© Pleiades Publishing, Ltd. 2009

Authors and Affiliations

  • V. E. Zharov
    • 1
  • M. V. Sazhin
    • 1
  • V. N. Sementsov
    • 1
  • K. V. Kuimov
    • 1
  • O. S. Sazhina
    • 1
  1. 1.Sternberg Astronomical InstituteMoscow State UniversityMoscowRussia

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