The occurrence of bulk relativistic motion in compact radio sources

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Active Galactic Nuclei, Bl Lacertae Objects, Extragalactic Radio Sources, Quasars, Relativistic Effects, Brightness Temperature, Flux Density, Red Shift, Very Long Base Interferometry, X Rays

Scientific paper

From two or more epoch high spatial resolution VLBI observations of compact extragalactic sources selected from the 5 GHz MPIfR-NRAO strong source surveys, there is good evidence that apparent superluminal motion is a common phenomenon among core-dominated compact extragalactic radio sources. Of the 12 sources with multiple epoch VLBI-measurements, 8 objects are candidates for apparent superluminal motion. The common occurrence of apparent superluminal motion confirms predictions of bulk relativistic motion made from the discrepancy of observed to predicted X-ray fluxes from SSC models and from flux density variations of the compact cores of these sources. However, as expected, some of the sources do not show significant changes in structure.

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