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Strong Gravitational Lensing of Quasi-Kerr Compact Object with Arbitrary Quadrupole Moments

General Relativity and Quantum Cosmology 2015-06-11 v1 High Energy Astrophysical Phenomena High Energy Physics - Theory

Abstract

We study the strong gravitational lensing on the equatorial plane of a quasi-Kerr compact object with arbitrary quadrupole moments which can be used to model the super-massive central object of the galaxy. We find that, when the quadrupolar correction parameter ξ\xi takes the positive (negative) value, the photon-sphere radius rpsr_{ps}, the minimum impact parameter upsu_{ps}, the coefficient bˉ\bar{b}, the relative magnitudes rmr_m and the angular position of the relativistic images θ\theta_{\infty} are larger (smaller) than the results obtained in the Kerr black hole, but the coefficient aˉ\bar{a}, the deflection angle α(θ)\alpha(\theta) and the angular separation ss are smaller (larger) than that in the Kerr black hole. These features may offer a way to probe special properties for some rotating compact objects by the astronomical instruments in the future.

Keywords

Cite

@article{arxiv.1208.1072,
  title  = {Strong Gravitational Lensing of Quasi-Kerr Compact Object with Arbitrary Quadrupole Moments},
  author = {Changqing Liu and Songbai Chen and Jiliang Jing},
  journal= {arXiv preprint arXiv:1208.1072},
  year   = {2015}
}

Comments

17 pages, 4 figures. Accepted for publication in JHEP