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V959 Mon is a classical nova detected at GeV gamma-ray wavelengths on 2012June 19. While classical novae are now routinely detected in gamma-rays, theorigin of the shocks that produce relativistic particles has remained unknown.We carried out electronic European VLBI Network (e-EVN) observations thatrevealed a pair of compact synchrotron emission features in V959 Mon on 2012Sep 18. Since synchrotron emission requires strong shocks as well, we identifythese features as the location where the gamma rays were produced. We alsodetected the extended ejecta in the follow-up EVN observations. They expandedmuch faster in East-West direction than the compact knots detected in theaforementioned e-EVN measurements. By comparing the VLBI results with lowerresolution images obtained using e-MERLIN and the VLA - as reported by Chomiuket al. (2014) - it appears that 1) influenced by the binary orbit, the novaejecta was highly asymmetric with a dense and slow outflow in the equatorialplane and low-density and faster ejecta along the poles; and 2) the VLBI knotswere related to shocks formed in the interaction region of these outflows.

VLBI detection of internal shocks in nova V959 Mon