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Context. Blazars are powerful active galactic nuclei (AGNs) radiatingprominently in the whole electromagnetic spectrum, from the radio to the X-rayand gamma-ray bands. Their emission is dominated by synchrotron andinverse-Compton radiation from a relativistic jet originating from an accretingcentral supermassive black hole. The object IGR J12319-0749 has recently beenidentified as a soft gamma-ray source with the IBIS instrument of the INTEGRALsatellite, coincident with a quasar at high redshift (z=3.12). Aims. We studiedthe radio structure of IGR J12319-0749 to strengthen its blazar identificationby detecting a compact radio jet on the milli-arcsecond (mas) angular scale,and to measure its astrometric position accurate to mas level. Methods. We usedthe technique of electronic very long baseline interferometry (e-VLBI) to imageIGR J12319-0749 with the European VLBI Network (EVN) at 5 GHz on 2012 June 19.Results. IGR J12319-0749 (J1231-0747) is a compact radio source, practicallyunresolved on interferometric baselines up to ~136 million wavelengths. Theestimated brightness temperature (at least ~2 x 10^12 K) indicates that theradio emission of its jet is Doppler-boosted. The accurate position of thecompact radio source is consistent with the positions measured at higherenergies.

A compact radio source in the high-redshift soft gamma-ray blazar IGR J12319-0749