Astrophysics and Space Science

, Volume 79, Issue 2, pp 469–481 | Cite as

The γ-ray emission from the Seyfert galaxy NGC 4151

  • L. Bassani
Article
  • 17 Downloads

Abstract

Light curves at X-ray, ultraviolet, optical and infrared wavelengths of NGC 4151 over the period 1977–1980 are presented together with a summary of the large amount of observational data relating to this Seyfert galaxy. Intensity variations in different wavebands are discussed and compared with recent low energy γ-ray observations of this object. The positive measurement of gamma-radiation in May 1977 is shown to have been characterised by a high optical state and a possible infrared maximum. The data presented are compared with the predictions of some emission mechanisms, which have been proposed to account for the gamma-radiation. In particular, a synchrotron self-Compton model, which relates the infrared/optical emission to the X-ray/low energy γ-ray emission is discussed.

Keywords

Observational Data Intensity Variation Light Curve Positive Measurement Optical State 

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Copyright information

© D. Reidel Publishing Co 1981

Authors and Affiliations

  • L. Bassani
    • 1
  1. 1.Department of PhysicsSouthampton UniversitySouthamptonEngland

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