Mathematics – Logic
Scientific paper
Aug 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985icrc....1..293d&link_type=abstract
In NASA. Goddard Space Flight Center 19th Intern. Cosmic Ray Conf., Vol. 1 p 293-296 (SEE N85-33902 22-93)
Mathematics
Logic
Disk Galaxies, Doppler Effect, Gamma Rays, Plasma Jets, Quasars, Relativistic Plasmas, Active Galaxies, Cosmology, Energy Spectra, Galactic Nuclei, Particle Energy, Photon Absorptiometry
Scientific paper
A new, simple and potentially useful method for constraining the kinematical parameters of relativistic jets based on gamma ray spectral measurements of Active Galaxies is presented. The application of this method to the Quasar 3C273 leads to a value of the Doppler factor of 3 to 4. This corresponds to jet parameters of mu 2 and theta 15 deg in good agreement with the values estimated independently from radio observations of superluminal motion. For the particular case of 3C273, the results are also compared to those given by a similar technique based on the comparison of the X-ray observational data with the synchrotron self Compton prediction from radio measurements. The application of the proposed technique to a significant sample of active galaxies as a result of future gamma ray surveys of the sky is briefly discussed, particularly with respect to possible ways to constrain the cosmological constants Ho and q sub o.
Bassani Loredana
Dean Anthony J.
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