Astronomy and Astrophysics – Astronomy
Scientific paper
May 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...297l...9r&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 297, no. 1, p. L9-L12
Astronomy and Astrophysics
Astronomy
22
Active Galactic Nuclei, Active Galaxies, Gamma Ray Astronomy, Gamma Rays, Quasars, Radio Astronomy, Radio Emission, Space Plasmas, Astronomical Interferometry, Doppler Effect, Electron Density (Concentration), Gamma Ray Observatory, Lorentz Transformations, Plasma Currents
Scientific paper
Nuclei of superluminal radio sources and of extragalactic gamma-ray sources associated with compact beamed radio sources are characterized by relativistic ejections of ultrarelativistic particles. Assuming for the Hubble constant, Ho approximately equal to 100 km/s(Mpc), one finds from the apparent motion-redshift diagram that the bulk Lorentz factor gamma is 3 less than or equal to gamma less than or equal to 10. The spectrum of the source GRO J0516-609 is characterized by a strong peak in the 1-10 MeV range, which can be explained as the signature of a broad blue shifted e+/- annihilation line amplified by the Doppler beaming effect. The typical densities of the e+/-are n+/- approximately equal to 4.4 x 108 cm-3. The high energy e+/- which escape after few light weeks will give rise to a new VLBI component. From COMPTEL and VLBI observations we show how it will be possible to determine the dynamical and geometrical characteristics of the relativistic e+/- beam when the apparent speed of the VLBI components of the associated compact radio source will be measured. Properties of powerful extragalactic radio sources can be understood if their nuclei ejecta fluids, i. e. a relativistic gamma beam responsible for superluminal radio sources and their gamma ray emission and a non-relativistic s- p jet responsible for the formation of kpc jets, hot spots and exteded lobes.
Hermsen Willem
Roland Jérémie
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