Superluminal Gravitational Microlensing Events in PKS 0537-441 and Prospects for Future Detection

  • G. C. Surpi
  • G. E. Romero
  • H. Vucetich
Conference paper
Part of the International Astronomical Union / Union Astronomique Internationale book series (IAUS, volume 173)

Abstract

The BL-Lac object PKS 0537-441 has recently displayed strong intraday variability at 1.42 GHz on time scales of ∼ 104 s. Such kind of variability is hardly consistent with an intrinsic-to-source origin, since apparent brightness temperatures higher than 1021 K are implied for the emitting region in the source.

An alternative explanation for this ultra-rapid radio variability in PKS 0537-441 is developed based on gravitational microlensing of a superluminal component in the blazar caused by compact objects in the halo of an intervening galaxy. The mass of the microlenses is estimated and the blazar is proposed as a good candidate in a systematic search for extragalactic MACHOs.

Keywords

Dark Matter Rotation Curve Compact Object Dark Matter Density Dark Halo 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

References

  1. Gopal-Krishna, Subramanian, K., 1991, Nature, 349, 766ADSCrossRefGoogle Scholar
  2. Romero, G.E., Combi, J.A., Colomb, F.R., 1994, A&A, 288, 731ADSGoogle Scholar
  3. Romero, G.E., Surpi, G., Vucetich, H., 1995, A&A, in pressGoogle Scholar
  4. Stickel, M., Fried, J.W., Kühr, H., 1988, A&A, 206, L30ADSGoogle Scholar
  5. Surpi, G., Romero, G.E., Vucetich, H., 1995, in preparationGoogle Scholar

Copyright information

© International Astronomical Union 1996

Authors and Affiliations

  • G. C. Surpi
    • 1
  • G. E. Romero
    • 2
  • H. Vucetich
    • 3
  1. 1.Depto. de Física, FCEyNUniversidad de Buenos Aires Ciudad Univresistaria - Pab. IBs. AsArgentina
  2. 2.Instituto Argentino de Radioastronomía CC5Bs. AsArgentina
  3. 3.FCAyG - Universidad Nacional de La PlataBs. AsArgentina

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