Abstract
Abstract We present the results of high-resolution imaging of the gamma-ray loud quasar PKS 1741–038 with the HALCA satellite and ground radio telescopes. Observations were made at two epochs at an interval of nine months with the first-epoch observation at 1.6 and 5 GHz and with the second-epoch observation at 5 GHz. The source shows a very compact structure, but is clearly resolved in the space-ground baseline visibility data. The core component of the source has a brightness temperature, Tb, greater than 1012 K in the source's rest frame at each frequency. We applied three individual jet models in order to derive the Doppler factor, δ . The core component has δ ∼ 14, considering the Tb limit due to the inverse Compton catastrophe, while a 2.5-times larger δ is obtained assuming that the particles and magnetic field are in equipartition. Two-epoch images at 5 GHz show almost no change of the structure. Assuming that the component motion in this interval is less than our resolution, we derived the upper limit of the viewing angle as being 4.°8. The smaller viewing angle and higher Doppler factor favor the inverse Compton gamma-ray emission model; we conclude that the gamma-ray emission from this source is highly Doppler-boosted.
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