Gamma-Ray Emission from Extragalactic Radio Sources: Egret Observations of Active Galactic Nuclei

  • Peter F. Michelson
Conference paper
Part of the International Astronomical Union book series (IAUS, volume 175)


The Energetic Gamma-Ray Experiment Telescope (EGRET) on the Compton Gamma-Ray Observatory is an imaging high-energy telescope with sensitivity from approximately 20 MeV to 30 GeV. EGRET has observed more than 129 sources during more than 4 years of operation. Among these sources, 51 have been identified with active galaxies. A common characteristic of the AGN sources is that they are all radio-loud, flat radio spectrum sources. Many of them are seen as superluminal radio sources as well. The gamma-ray emission characteristics of these sources are reviewed and some of the proposed emission models are discussed.


Radio Source Accretion Disk Active Galactic Nucleus Active Galaxy Extragalactic Radio Source 
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.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Blandford, R.D. & Levinson, A. 1995, ApJ, 441, 79ADSCrossRefGoogle Scholar
  2. Blandford, R. & Rees, M.J., 1978, in Pittsburgh Conference on Bl Lac Objects, ed. A.N. Wolfe (University of Pittsburgh Press), 328Google Scholar
  3. Dermer, C.D., Schlickeiser, R., & Mastichiadis, A. 1992, A&A, 256, L27ADSGoogle Scholar
  4. Dermer, C.D., & Schlickeiser, R. 1992, Science, 257, 1642ADSCrossRefGoogle Scholar
  5. Jones, T.W., O’Dell, S.L., & Stein, W.A. 1974, ApJ, 188, 353ADSCrossRefGoogle Scholar
  6. Königl, A., 1981, ApJ, 243, 700ADSCrossRefGoogle Scholar
  7. Lind, K.R., and Blandford, R.D., 1985, ApJ, 295, 358ADSCrossRefGoogle Scholar
  8. Mannheim, K., & Biermann, P.L., 1992, A&A, 53, L21Google Scholar
  9. Mannheim, K., & Biermann, P.L., 1989, A&A, 221, 211ADSGoogle Scholar
  10. Mannheim, K., 1993, Phys. Rev. D, 48, 2408ADSCrossRefGoogle Scholar
  11. Maraschi, L., Ghisellini, G., & Celotti, A., 1992, ApJ, 397, L5ADSCrossRefGoogle Scholar
  12. Marscher, A.P., 1980, ApJ, 235, 386ADSCrossRefGoogle Scholar
  13. Marscher, A.P., & Bloom, S.D., 1992, in Proc. of the CGRO Science Workshop, NASA Conf. Pub. 3137, 346Google Scholar
  14. McBreen, B., 1979, A&A, 71, L17ADSGoogle Scholar
  15. Melia, F., & Königl, A., 1989, ApJ, 340, 162ADSCrossRefGoogle Scholar
  16. von Montigny, C., et al., 1995, ApJ, 440, 525ADSCrossRefGoogle Scholar
  17. Punch, M., et al., 1992, Nature, 358, 477ADSCrossRefGoogle Scholar
  18. Sikora, M., Begelman, M.C., & Rees, M.J. 1993, in Proceedings of the Compton Symposium, in pressGoogle Scholar
  19. Thompson, D.J., et al., 1995, The Second EGRET Catalog of High-Energy Gamma-Ray Sources, accepted for publication in ApJ Suppl.Google Scholar

Copyright information

© International Astronomical Union 1996

Authors and Affiliations

  • Peter F. Michelson
    • 1
  1. 1.Dept. of PhysicsStanford UniversityStanfordUSA

Personalised recommendations