VLBI Observations of Southern EGRET Identifications. I. PKS 0208-512, PKS 0521-365, and PKS 0537-441

Astronomy and Astrophysics – Astronomy

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Galaxies: Active, Galaxies: Jets, Gamma Rays: Observations, Techniques: Interferometric

Scientific paper

We present high-resolution very long baseline interferometry images of three southern radio sources that the Energetic Gamma-Ray Experiment Telescope (EGRET), on board the Compton Gamma Ray Observatory, has identified as greater than 100 MeV gamma-ray sources. These are the first results in a continuing program of VLBI observations of southern EGRET identifications. For two of these sources, PKS 0208-512 (at 4.851 GHz) and PKS 0537-441 (at 4.851 and 8.418 GHz), the images represent first- epoch observations. For the remaining lower redshift object, PKS 0521- 365, we present images from three epochs at 4.851 GHz and an image from one further epoch at 8.418 GHz, spanning approximately 1 yr. We discuss the need for further extensive VLBI observations of EGRET-identified radio sources.

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