Gamma-ray observations and relativistic jets in active galactic nuclei

Details Gamma-ray observations and relativistic jets in active galactic nuclei Gamma-ray observations and relativistic jets in active galactic nuclei

Jun 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...161...85b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 161, no. 1, June 1986, p. 85-88. SERC-CNR-supported research.

Astronomy and Astrophysics

Astronomy

4

Active Galactic Nuclei, Gamma Ray Astronomy, Radio Jets (Astronomy), Relativistic Velocity, Doppler Effect, Gamma Ray Absorption, Gamma Ray Spectra

Scientific paper

Independent lines of evidence for the presence of relativistic jets in active galactic nuclei (AGN) include high resolution radio maps, superluminal expansion measurements, brightness temperature limits, synchrotron self-Compton predictions of the X-ray flux density. Due to relativistic effects, the physical parameters observed from jet structures are quite different from their corresponding rest frame values. As a consequence, any discussion involving the physics of sources having jet phenomena must take this alteration into account. Here, for example, the consequences of relativistic bulk motion on the absorption of gamma-rays by pair producing photon-photon collisions with X-rays are investigated. It is shown that gamma-ray spectral measurements of AGN can yield independent estimates of the Doppler factor of the jet. Futhermore, use of the gamma-ray data in conjunction with X-ray and radio measurements enable a unique set of parameters to be obtained which describe the geometry and the kinematics of the jet motion.

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