Astronomy Letters

, Volume 31, Issue 3, pp 147–151

Constraints on the photon charge from observations of extragalactic sources

  • V. V. Kobychev
  • S. B. Popov

DOI: 10.1134/1.1883345

Cite this article as:
Kobychev, V.V. & Popov, S.B. Astron. Lett. (2005) 31: 147. doi:10.1134/1.1883345


Having analyzed high-resolution observations of extragalactic compact radio sources with modern systems of radio telescopes, we obtained an estimate of the upper limit for the photon electric charge, eγ ≲ 3×10−33 of the elementary charge (assuming the photon charge to be energy independent). This is three orders of magnitude better than the limit obtained from radio pulsar timing. We also set a limit on the charge of a gamma-ray (energy ∼0.1 MeV) photon. In the future, the estimate based on extragalactic sources can be improved significantly.

Key words

fundamental constantsradio sourcesextragalactic magnetic fields

Copyright information

© Pleiades Publishing, Inc. 2005

Authors and Affiliations

  • V. V. Kobychev
    • 1
  • S. B. Popov
    • 2
    • 3
  1. 1.Institute for Nuclear ResearchNational Academy of Sciences of UkraineKievUkraine
  2. 2.University of PadovaPadovaItaly
  3. 3.Sternberg Astronomical InstituteMoscowRussia